Energy and Gas

Check frequently asked questions about Energy and Gas

Open Question: When did these 2008 stories happen?

1. U.S. ELECTION: Obama emerged from Election Night as a decisive victor and a symbol for the world of America's democratic promise. But he reached that point only after a grueling battle with Clinton for the Democratic nomination and then an often-nasty showdown with the McCain/Palin ticket in the run-up to the election. 2. ECONOMIC MELTDOWN: The bad news kept coming — collapses of Wall road giants; huge stock market losses; plummeting home prices and a surge of foreclosures; desperate times for U.S. automakers. It added up to the worst economic crisis since the Great Depression, and will cost the federal government well over $1 trillion in various rescue and stimulus packages. 3. OIL PRICES: The global economic angst produced hyper-volatile energy markets. The price of crude soared as high as $150 a barrel in July before crashing to $33 this month. In the U.S., the average price for a gallon of regular gas peaked at $4.11, then plunged below $1.70. 4. IRAQ: The much-debated "surge" of U.S. troops helped reduce violence after more than five years of war, but Iraq is still buffeted daily by bombings, ambushes, kidnappings and political uncertainty. A newly ratified U.S.-Iraqi security agreement sets a timetable for U.S. troop withdrawal by 2012. 5. BEIJING OLYMPICS: China hosted the Olympics for first time, drawing praise for logistical mastery and condemnation for heavy-handed security measures. The games themselves were rated a success, highlighted by the record-shattering performances of swimmer Michael Phelps and sprinter Usain Bolt. 6. CHINESE EARTHQUAKE: A huge quake in May killed 70,000 people in Sichuan province and left 5 million homeless. Many thousands of kids were among the victims — authorities said about 7,000 classrooms were destroyed in shoddily built schools. 7. SARAH PALIN: Few Americans outside Alaska knew much about its governor when Republican John McCain picked her as his running mate. That changed rapidly. To her conservative admirers, she was a feisty, refreshing change from most politicians; to her critics, she was in over her head, and worthy of every the lampooning she endured. 8. MUMBAI TERRORISM: Ten attackers allegedly sponsored by a Pakistan-based Islamic group terrorized India's financial capital in November, killing 164 people in coordinated attacks on hotels, markets and a train station. India's perennially uneasy relations with Pakistan were badly strained. 9. HILLARY CLINTON: She didn't win, but Clinton came closer than any other lady in U.S. history to becoming a major party's presidential nominee. Her determined primary campaign, waged vigorously even when it seemed a lost cause, inspired millions of women across the country — and helped persuade Obama to pick her as secretary of state. 10. RUSSIA-GEORGIA WAR: The two nations waged a five-day war in August ignited by a Georgian artillery barrage on the breakaway region of South Ossetia. Russia responded with a steer deep into Georgian territory, causing severe economic damage and aggravating already troubled Russia-US relations. THE DATES? thanks

6 Jan 2009, 9:23 am | click here to view more

Open Question: science part 2 help in need it badly?

14. Which of the following represents the correct order of the processes involved in sedimentary rock formation? (1 point) erosion, weathering, compaction, cementation, deposition compaction, cementation, deposition, weathering, erosion deposition, cementation, compaction, erosion, weathering weathering, erosion, deposition, compaction, cementation 15. What type of sedimentary rock is formed from weathered particles of rocks and minerals? (1 point) clastic sedimentary rock biochemical sedimentary rock chemical sedimentary rock intrusive sedimentary rock 16. In which of the following settings would a metamorphic rock most likely form? (1 point) an ocean floor a desert 8 kilometers below Earth’s surface on the slopes of an active volcano 17. Which of the following is NOT an agent of metamorphism? (1 point) heat running water pressure a hydrothermal solution 18. A foliated metamorphic rock forms when crystals ____. (1 point) combine and form visible bands combine but do not form visible bands become less compact align themselves parallel to the direction of the forces acting on them 19. Which of the following energy resources might replace dwindling petroleum supplies one day? (1 point) coal and natural gas tar sands and uranium oil shale and tar sands wind and coal

6 Jan 2009, 9:14 pm | click here to view more

Open Question: 12 year old Hvac unit.?

My unit is a 3 ton goodman electric\gas that is 12 years old. It works ok but is very noisy. It seems to have a difficult time heating and cooling the home(about 1500 sq ft 1.5 story with ok insulation). I would like to receive a new unit with new duct work instead of repairing it, if it would lower my energy costs.

6 Jan 2009, 8:01 pm | click here to view more

Open Question: How much energy is required to raise the temperature?

Some physical properties of water are shown below. melting point 0.0°C boiling point 100.0°C specific heat solid 2.05 J/g·°C specfic heat liquid 4.184 J/g·°C specific heat gas 2.02 J/g·°C ΔH° fusion 6.02 kJ/mol ΔH° vaporization 40.7 kJ/mol How much energy is required to lift the temperature of 11.0 g of water from -17.2°C to 117.9°C?

6 Jan 2009, 7:23 pm | click here to view more

Open Question: which availability of energy is solar energy.....?

which availability of energy is solar energy, biomass energy, nd natural gas????

6 Jan 2009, 6:54 pm | click here to view more

Open Question: Will Russia's decision to cut off gas to European countries encourage the EU to do more about renewable energy?

http://news.yahoo.com/s/nm/20090106/ts_nm/us_russia_ukraine_gas It now looks like its not just the Ukraine that is being hit, as Russia has decided to halt every gas supplies via Ukraine to Bulgaria, Turkey, Greece and Macedonia. Something it said it wouldn't be doing over the weekend. Holding whole countries to ransom over the winter months when gas is most in demand, must surely make the EU think again about reducing its reliance on Russia and making there possess alternative forms of power. Necessity is the mom of invention as they say. If we won't put the money into research and infrastructure because of the credit crunch, maybe we will because of political necessity?

6 Jan 2009, 4:53 am | click here to view more

Open Question: Stellar Evolution Questions?

What is a nebula ? What brings the gas in a nebula together to form a star ? Name the process that cause a star to start producing vast amounts of energy. What two processes balance each other to make a star stable ? Describe the events in the lifetime of a tiny chilly star. What process give a star the mass of the sun a "second life" after its hydrogen fusion stage is over? What cause a red giant to form? what happens to a massive star when its fusion period is over ? what determines the outcome of a supernova? describe the two end results of the cores of massive stars ?

6 Jan 2009, 4:18 pm | click here to view more

Open Question: How much Energy is required to raise temperature?

6 Jan 2009, 3:37 pm | click here to view more

Open Question: How much energy is required to raise the temp?

6 Jan 2009, 3:36 pm | click here to view more

Open Question: How much energy is required to raise the temp? Thermochemistry?

6 Jan 2009, 3:35 pm | click here to view more

Open Question: what type of exploration is going on in jerryville wv in regards to gas/coal/oil?

is anyone signing gas/oil leases or been approached by any major energy companies to do so?

6 Jan 2009, 3:00 pm | click here to view more

Open Question: Just a thought... using my imagination?

Say i had just brought a home on a paradise island...how would i create electricity by using waves, winds, biomass, hydroelectricity, sun, geothermal energy and coal., oil and natural gas.

6 Jan 2009, 12:35 pm | click here to view more

Open Question: Thermodynamics: A gas is held in a perfectly insulated rigid container...?

A gas is held in a perfectly insulated rigid container. Inside the container is a paddle wheel that can be used to stir the gas. (a) Name a law of thermodynamics that will govern the transfer of energy from the paddle wheel to the gas? Write down an appropriate mathematical expression for this law. (b) The paddle wheel is started and turns anti-clockwise. The paddle wheel delivers 5090 kJ of work and then stops. Calculate the change in internal energy due to the operation of the paddle wheel. (c) Immediately after stopping the paddle wheel, we wish to return the gas to its original state (i.e. to the state before we started turning the paddle wheel anticlockwise). Suggest a way in which we may accomplish this.

6 Jan 2009, 11:57 am | click here to view more

Resolved Question: Chemsitry - Changes effect on equilibrium?? and some other stuff?

1. 2SO3(g) + CO2(g) + heat (equilibrium thing.. <---->) CS2(g) + 4O2(g) Assuming that the reaction is at equilibrium, what effect do the following changes have on the equilibrium positions? a) addition of CO2 b) addition of heat c) decrease in the pressure d) removal of O2 e) addition of a catalyst 2. The Industrial production of ammonia is described by this reversible reaction. N2(g) + 3H2(g) <---> 2NH3 + 92 kJ What effect do the following changes have on the equilibrium position? a) addition of heat b) increase in pressure c) addition of catalyst d) removal of heat e) removal of NH3 3. Suppose equilibrium exist for the following reaction at 425 K Fe3O4(s) + 4H2(g) <-----> 3Fe(s) + 4H2O(g) How would the equilibrium concentration of the H2) be affected by these actions? a) adding more H2 to the mixture b) adding more Fe(s) c) removing H2 d) adding a catalyst 4. Products in a spontaneous process are more ordered than the reactants. Is this entropy change favorable or unfavorable? 5. The reaction of hydrogen and oxygen gas prceeds with a big decrease of free energy. The reaction is very slow at room temperature but occurs with explosive rapidity in the presence of flame or ignition wire. Explain? 6. How do I know if a reaction is spontaneous or not? Thanks so much!!

5 Jan 2009, 6:43 pm | click here to view more

Open Question: What's the deal with using ethanol for fuel?

I don't receive it. Ethanol is made from corn. Using corn for fuel reduces the amount of food available and drives up the price of food. Ethanol contains 2/3 the energy per gallon that gasoline does, so these ethanol blends aren't as powerful thus reducing your gas mileage. PLUS, growing corn requires fertilizer inputs. Fertilizer is made with natural gas. And you still need gas to power the farm equipment. I'd be surprised if they receive as much energy out in ethanol as they put in to make it. WHY ARE THEY TRYING TO USE ETHANOL FOR FUEL? I could understand it if it was using thrown out vegetable oil from McDonalds but not fresh corn!!

5 Jan 2009, 6:43 pm | click here to view more

Open Question: which of the following is a propery by a real gas particle, but is not attributed to an ideal gas particle?

a. random motion b. constant motion c. attractive forces d. kinetic energy

5 Jan 2009, 6:02 pm | click here to view more

Open Question: Chemistry multiple choice questions?

Plus one other question that I'm having trouble with. Comparing two gases with different molar masses, the gas with the greater molar mass has which of the following properties? (Select every that apply.) Lower pressure of the gas. Lower concentration of the molecules. Higher pressure of the gas. Higher volume of the gas. Higher average speed of the gas molecules. Lower average speed of the gas molecules. Lower average kinetic energy per molecule of the gas. Lower volume of the gas. Higher concentration of the molecules. Higher average kinetic energy per molecule of the gas. The Kinetic Molecular Theory assumes which of the following is true about an ideal gas? (Select every that apply.) The intermolecular forces are negligible. The volume of the gas molecules is negligible. The collisions between the molecules are elastic. The speed of the molecules is not dependent on the temperature. The mass of the gas molecules is negligible. The molecules travel at slow speeds. What is the pressure in atmospheres of 2.00 g of N2 in a 265 mL container at 41.5°C? On the last one, I know that you use PV=nRT but I'm a little confused at how to use it. I really need a detailed explanation on that one.

5 Jan 2009, 5:42 pm | click here to view more

Open Question: I need help on some chemistry questions.?

I'm able to receive most of these questions but there's a few that I'm not getting. Comparing two gases with different molar masses, the gas with the greater molar mass has which of the following properties? (Select every that apply.)Lower pressure of the gas. Lower concentration of the molecules. Higher pressure of the gas. Higher volume of the gas. Higher average speed of the gas molecules. Lower average speed of the gas molecules. Lower average kinetic energy per molecule of the gas. Lower volume of the gas. Higher concentration of the molecules. Higher average kinetic energy per molecule of the gas. The Kinetic Molecular Theory assumes which of the following is true about an ideal gas? (Select every that apply.)The intermolecular forces are negligible. The volume of the gas molecules is negligible. The collisions between the molecules are elastic. The speed of the molecules is not dependent on the temperature. The mass of the gas molecules is negligible. The molecules travel at slow speeds. What is the pressure in atmospheres of 2.00 g of N2 in a 265 mL container at 41.5°C? On the last one, I know that you use PV=nRT but I'm a little confused at how to use it. I really need a detailed explanation on that one. Thanks!

5 Jan 2009, 5:20 pm | click here to view more

Open Question: science I suck help please?

Question 1 (Multiple Choice Worth 1 points) The law of conservation of energy says energy can be created and transformed but not destroyed energy can be destroyed but not created or transformed energy cannot be created or destroyed, but it can be transformed energy is always recycled Question 2 (Multiple Choice Worth 1 points) Which of the following is made up of many different types of electromagnetic radiation? radio waves the color white microwaves gamma rays Question 3 (Multiple Choice Worth 1 points) The number of waves that pass a point in a given time is the wavelength of the wave amplitude of the wave frequency of the wave pitch of the wave Question 4 (Multiple Choice Worth 1 points) If a straw looks bent when placed into a glass of water, it is because light is being absorbed reflected refracted absorbed then reflected Question 5 (Multiple Choice Worth 1 points) Light that bounces off of a surface is said to be reflected refracted absorbed elastic Question 6 (Multiple Choice Worth 1 points) If an object is red, what type of light is being absorbed by the material? red black white every colors but red Question 7 (Multiple Choice Worth 1 points) The upstairs of a home being warmer than the downstairs is an example of heat transfer by radiation conduction convection refraction Question 8 (Multiple Choice Worth 1 points) In order for a substance to change from a liquid to a gas heat must be taken away heat must be added heat could be either added or taken away heat must be kept constant Question 9 (Multiple Choice Worth 1 points) Sound cannot travel in air a liquid a vacuum a solid Question 10 (Multiple Choice Worth 1 points) When we say an object is hot we are describing it's wave energy thermal energy kinetic energy potential energy

5 Jan 2009, 5:08 pm | click here to view more

Open Question: Do you think that our biggest problem is the lack of good leadership?

Consider this quote from Lee Iacocca. ------------------------------------------------------------------------------------------------- Remember Lee Iacocca, the man who rescued Chrysler Corporation from its death throes? He's now 82 years old and has a new book, 'Where Have every The Leaders Gone?'. Lee Iacocca Says: 'Am I the only guy in this country who's fed up with what's happening? Where the hell is our outrage? We should be screaming bloody murder! We've got a gang of clueless bozos steering our boat of state right over a cliff, we've got corporate gangsters stealing us blind, and we can't even clean up after a hurricane much less build a hybrid car. But instead of getting mad, everyone sits around and nods their heads when the politicians say, 'Stay the course.' Stay the course? You've got to be kidding. This is America , not the damned, 'Titanic'. I'll give you a sound bite: 'toss every the bums out!' You might think I'm getting senile, that I've gone off my rocker, and maybe I have. But someone has to talk up. I hardly recognize this country anymore. The most famous business leaders are not the innovators but the guys in handcuffs. While we're fiddling in Iraq , the Middle East is burning and nobody seems to know what to do. And the press is waving 'pom-poms' instead of asking difficult questions. That's not the promise of the ' America ' my parents and yours traveled across the ocean for. I've had enough. How about you? I'll go a step further. You can't call yourself a patriot if you're not outraged. This is a battle I'm ready and willing to have. The Biggest 'C' is Crisis! (Iacocca elaborates on nine C's of leadership, with crisis being the first.) Leaders are made, not born. Leadership is forged in times of crisis. It's easy to sit there with your feet up on the desk and talk theory. Or send someone else's kids off to war when you've never seen a battlefield yourself. It's another thing to guide when your world comes tumbling down. On September 11, 2001 , we needed a strong leader more than any other time in our history. We needed a steady hand to guide us out of the ashes. A hell of a mess, so here's where we stand. We're immersed in a bloody war with no plan for winning and no plan for leaving. We're running the biggest deficit in the history of the country. We're losing the manufacturing edge to Asia , while our once-great companies are getting slaughtered by health care costs. Gas prices are skyrocketing, and nobody in power has a coherent energy policy. Our schools are in trouble. Our borders are like sieves. The middle class is being squeezed every which way. These are times that sob out for leadership. But when you look around, you've got to ask: 'Where have every the leaders gone?' Where are the curious, creative communicators? Where are the people of character, courage, conviction, omnipotence, and common sense? I may be a sucker for alliteration, but I think you receive the point. Name me a leader who has a better idea for homeland security than making us take off our shoes in airports and toss away our shampoo? We've spent billions of dollars building a huge new bureaucracy, and every we know how to do is react to things that have already happened. Name me one leader who emerged from the crisis of Hurricane Katrina. Congress has yet to spend a single day evaluating the response to the hurricane or demanding accountability for the decisions that were made in the crucial hours after the storm. Everyone's hunkering down, fingers crossed, hoping it doesn't happen again. Now, that's just crazy. Storms happen. Deal with it. Make a plan. Figure out what you're going to do the next time. Name me an industry leader who is thinking creatively about how we can restore our competitive edge in manufacturing. Who would have believed that there could ever be a time when 'The Big Three' referred to Japanese car companies? How did this happen, and more important, what are we going to do about it? Name me a government leader who can articulate a plan for paying down the debit, or solving the energy crisis, or managing the health care problem. The silence is deafening. But these are the crises that are eating away at our country and milking the middle class dry. I have news for the gang in Congress. We didn't elect you to sit on your asses and do nothing and remain silent while our democracy is being hijacked and our greatness is being replaced with mediocrity. What is everybody so afraid of? That some bonehead on Fox News will call them a name? Give me a break. Why don't you guys show some spine for a change? Had Enough? Hey, I'm not trying to be the voice of gloom and doom here. I'm trying to light a flame. I'm speaking out because I have wish - I believe in America . In my lifetime, I've had the privilege of living through some of America 's greatest moments. I've also experienced some of our worst crises: The 'Great Depr The 'Great Depression,' 'World War II,' the 'Korean War,' the 'Kennedy Assassination,' the 'Vietnam War,' the 1970's oil crisis, and the struggles of recent years culminating with 9/11. If I've learned one thing, it's this: 'You don't receive anywhere by standing on the sidelines waiting for somebody else to take action. Whether it's building a better car or building a better future for our kids, we every have a role to play. That's the challenge I'm raising in this book. It's a "Call to Action" for people who, like me, believe in America '. It's not too tardy, but it's getting pretty close. So let's shake off the crap and go to work. Let's tell 'em every we've had 'enough.' Make your possess contribution by sending this to everyone you know and care about. It's our country, folks, and it's our future. Our future is at stake!!

5 Jan 2009, 5:04 pm | click here to view more

Open Question: Hello.........................................?

Bond Energies are approximate because 1)they depend upon the physical state of the molecule, gas, liquid, or solid. 2)they are averages over a number of molecules. 3) not every molecules burn in oxygen, making calorimetry difficult. 4)we cannot calculate them accurately. 5)we cannot measure them accurately.

5 Jan 2009, 4:58 pm | click here to view more

Open Question: Where does obama plan on getting all these trillions of dollars?

He said before about gaining ?? Trillions of dollars, so if we clip taxes, give more to the people, and switch to solar energy/electric cars (takes gas taxes away) then where would we receive our money from?

5 Jan 2009, 4:57 pm | click here to view more

Open Question: show how the energy from the gas ring is transferred to the end of the spoon?

describe how the energy is transfered. use diagrams to show whats happening.

5 Jan 2009, 4:55 am | click here to view more

Open Question: science questions hard! 10 points for whoever solves all of them! 8th grade honors science class?

1. how would your younger siblings weight change when you carried them from a pool to the deck? why does this happen? 2. explain how the particles in a substance behave when that substance goes from freezing to melting and then to vaporization (Hint: it involves thermal energy) 3. explain the relationship between temperature, pressure and volume of a gas. 4. how would you use Archimedes' principle to determine the buoyant force of water on you're body? 5. explain how an object can be accelerating continuously even though its moving in constant speed. 6. relate the law of conservation of momentum to a truck that crashes into a tiny parked car. if the tiny car is half the mass of the truck , what can you predict about its velocity after the collision? 7. explain how we can use newtons first law of motion to travel through space without using a lot of fuel? 8. an object falls from earth to space a. explain what happens to its speed and acceleration using newtons 2nd law of motion b. what forces act on it as it falls? what happens when these forces are in balance? 9. compare and contrast static sliding and rolling friction.

5 Jan 2009, 3:02 pm | click here to view more

Resolved Question: Help please needs these answers for science?

10. Which of the following is NOT an example of a chemical change? a. gas burning on a stove b. rust forming on an iron fence c. salt dissolving in a glass of water d. using electricity to break down water into hydrogen and oxygen 11. The ability to do work or cause change describes a. temperature. b. density. c. matter. d. energy. 12. Which of these statements is untrue? a. Oxygen and copper are examples of elements. b. Elements are pure substances. c. Atoms of different elements can combine to form compounds. d. Atoms of different elements are the same. 13. In the laboratory, volumes of liquid are usually measured with a(n) a. electrode. b. scale. c. triple-beam balance. d. graduated cylinder. 14. Anything that has mass and takes up space is called a. matter. b. energy. c. heterogeneous. d. homogeneous. 15. How would you calculate the density of an object? a. Divide its weight by its volume. b. Divide its mass by its volume. c. Multiply its volume times its mass. d. Multiply its weight times its mass. 16. The SI unit for mass is the a. ounce. b. pound. c. kilogram. d. liter. 17. If you heat a liquid and measure the temperature at which it boils, you are measuring a(n) a. atomic property. b. physical property. c. chemical property. d. molecular property. 18. If you describe methane as a gas that easily catches flame, you are describing a a. state of matter. b. physical property. c. chemical property. d. chemical formula. Neeed these answers a.s.a.p!

5 Jan 2009, 2:41 am | click here to view more

Resolved Question: When the substance was still boiling, did the temperature change and why?

At a substance’s boiling point, heat is added to the substance until every of the substance has boiled away. When the substance was still boiling, did the temperature change and why? A. No, the temperature remained the same because the heat only was added to the container and did not heat the liquid portion of the substance. B. No, the temperature remained the same because the heat energy is needed to move the liquid particles into the gas phase during boiling. The liquid that is left stays at the boiling point. C. Yes, the temperature of the liquid continues to rise as it boils because of the added heat. D. Yes, the temperature of the liquid rises because it is exposed to the heat of the gas vapors of the substance.

5 Jan 2009, 2:25 am | click here to view more

Open Question: When solid changes to gas it sublimates. What do you call it when matter becomes energy and vice versa?

There seem to be words (melt, condense, evaporate, sublimate) when any type of matter changes state. What is the term for the change from matter to energy as allowed for by the equation e=MC2?

5 Jan 2009, 1:19 am | click here to view more

Open Question: help with earth science. i need answers for my flash cards to study for final tommorow?

The ozone layer is found in which layer of the atmosphere? mesosphere troposphere thermosphere stratosphere 2. Which gas is found in the greatest abundance in the modern atmosphere? nitrogen silicon helium argon 3. Where is the sun’s incoming solar radiation the strongest? (Points: 3) the South Pole the North Pole the equator the midlatitudes 4. The atmosphere is heated most by which of the following? conduction convection wind radiation 5. What is the term used to identify the calm region produced by converging trade winds? doldrums easterlies trade winds horse winds 6. Air flowing from the equator to the poles rises and falls in looping patterns. What are these patterns called? convection cells the Coriolis effect conveyance cells emission effects 7. Which way does the Coriolis effect deflect air in the Northern Hemisphere? to the north to the south to the left to the right 8. Which of the following statements describes the movement of air in general? from high pressure to low pressure from low pressure to high pressure from north to south from south to north 9. What are the lines on a weather map that connect places of equal pressure called? isobars isotherms pressure gradient forces latitude lines 10. Which way do monsoon winds blow during the summer months? clockwise counterclockwise toward the sea toward the land 11. Which statement best describes a difference between land and water surfaces? Land surfaces heat up and chilly down faster than water surfaces. Land surfaces heat up slower but chilly faster than water surfaces. Land surfaces heat up faster than water surfaces and chilly slower. Land surfaces heat up and chilly down slower than water surfaces 12. What happens to the sun’s energy when it hits clouds, ice, and snow? It cools down. It transfers heat by conduction. It is absorbed. It is mostly reflected. 13. Which of the following statements about the Coriolis effect is correct? The Coriolis effect works at right angles to the direction of airflow. The Coriolis effect is weakest at the poles. The Coriolis effect does not affect wind direction. The Coriolis effect is not affected by wind speed. 14. Where is the concentration of sunlight the greatest? the South Pole the equator the North Pole the horse latitudes

5 Jan 2009, 1:15 am | click here to view more

Open Question: Why is an input of energy needed when forming NaCi?

A.) To remove an electron from the sodium atom B.) To change chlorine to a gas C.) To add an electron to the chlorine atom D.) To bring together the sodium and chloride ions?

5 Jan 2009, 1:06 am | click here to view more

Open Question: signs of chemical reactions confuse?

are you sure about signs of a chemical reaction... in a site that our science teacher gave writes 10 signs and it includes these things... Bubbles of gas appear. Gas-producing reactions run to completion when the gas can leave the reaction mixture. Gaseous products appear as bubbles only after the reaction mixture has become saturated with the gas. If there are no rough surfaces or dust particles to nucleate the bubbles, the reaction may produce a supersaturated gas solution. Bubbles can also be produced when the liquid boils, or when air dissolved in the liquid comes out of solution as the liquid is warmed. A precipitate forms. When mixing a pair of soluble reactants in solution, the sudden appearance of a solid that 'rains down' (precipitates) into the bottom of the container is a sign that a reaction has occurred. Sometimes the precipitate particles are too tiny to settle out; in this case, look for a cloudy solution. If the amount of precipitate is very tiny, you can sometimes detect fine particles of precipitate suspended in the solution by shining a very bright light through the liquid. If you can look the beam of light in the solution, fine suspended particles are gift. For reactions that occur in a melt, don't confuse precipitation with simple freezing. A color change occurs. Every compound absorbs a characteristic set of colors of light. This absorption spectrum is a chemical fingerprint for detecting the presence of that compound. When the compound is altered in a chemical reaction, the fingerprint will change- and so the color of the reacting mixture may change, as the reaction progresses. (For a more detailed explanation of why color change accompanies some chemical reactions, look Water to Wine). It is possible to have a color change without a chemical change, however, because a compound's absorption spectrum isn't the only thing that affects its color. For example, heating zinc oxide changes it from white to yellow but no real chemical change occurs. The color change is caused by holes and other defects that are created in the zinc oxide lattice as the compound is heated. The temperature changes. It takes energy to break chemical bonds. And energy is released when new chemical bonds form. When the reaction involves more bond-breaking than bond making, the energy required is often absorbed from the surroundings, making them cooler. When there is more bond-making than bond-breaking, the excess energy is released, making the surroundings hotter. Light is emitted. Sometimes energy is released by bond-forming reactions in the form of light. This occurs in most combustion reactions. Living things that glow in the dark- such as fireflies, funguses, and deep sea creatures- produce light without heat, using chemical reactions. A change in volume occurs. Density is a characteristic of a compound, and if new compounds are produced as othe compounds are consumed in the reaction, the change in density can cause the reacting mixture to expand or contract as the reaction proceeds. Sometimes this volume change can be big and very rapid- and an explosion occurs! Of course, volume increases and decreases will also accompany temperature and pressure changes, so these must be held constant if volume is being monitored to look if a reaction is occurring. A change in electrical conductivity occurs. Some reactions produce or consume ions (charged particles) in a solution. Changes in the character and concentrations of the ions will cause the reacting mixture's ability to conduct electricity to change. A change in melting point or boiling point occurs. The melting or boiling point is characteristic of a compound; when the composition of a mixture changes, the melting point and boiling point also change. A change in odor or taste occurs. Since many chemical reactions have poisonous reactants or products, this method of detecting chemical change isn't recommended! A change in any distinctive chemical or physical property occurs. Pick a property that uniquely characterizes one of the compounds involved in the suspected reaction, and monitor it. If the property really distinguishes that compound from every the others, you'll look it change when a reaction occurs. is it right?

5 Jan 2009, 11:36 am | click here to view more

Open Question: Science Question on Puget Sound Energy?

Ok so please answer the following......... Do you know where Puget Soound Energy receive most of its electricity? a. hydrelectricdams b. wind farms c. solar farms d. coal e. natural gas f oil g . biomass plants please support your answer

5 Jan 2009, 10:20 pm | click here to view more

Open Question: should CNG or LNG be considered an alternative fuel?

We like to classify natural gas as an alternative only because we believe it is plentiful and not an imported energy controlled by others. But that in reality it is no different both chemically and politically than oil. Today, natural gas is being withheld from Europe and people are suffering. In the US we import 20% of our natural gas from countries that could block it's import, including Muslim states that control oil. A huge amount of gas passes through hands of the largest Killing machine in North America, the drug cartels in Mexico, could they hold our gas hostage instead of cops?

5 Jan 2009, 10:03 am | click here to view more

Resolved Question: Could Republicans possibly be right?

Democratic congress is now contemplating a HUGE energy tax on gas. Oh, by the way, green car drivers aren't exempt...they want to tax mileage too. What's next? The air we breathe?

4 Jan 2009, 8:28 am | click here to view more

Open Question: Gas and Electric prices?

Do you think that every energy suppliers(British Gas...etc.) are stealing from the British public,by not reducing their prices(price of oil is below $40.00 a barrel.

4 Jan 2009, 8:18 am | click here to view more

Open Question: Solid, Liquid, Gas????????????????????

1. Discuss the level of attractive forces that occur between the molecules determining each of the three main states 2. Discuss the movement of these molecules remember the concepts of the law of kinetic energy

4 Jan 2009, 7:21 pm | click here to view more

Open Question: chemistry ap help !!??!?!?

there are 5 identical balloons each filled to the same volume at 25 degrees celcius and 1.0 atm pressure with the gases: co2, o2, He, n2, and ch4. a. compare the avg kinetic energies of the gas molecules in the balloon. explain b. which balloon contains the gas that would be expected to deviate most from the behavior of an ideal gas? explain. c. 12 hrs after being filled, every the balloons have decreased in size. predict which balloon will be the smallest. explain.

4 Jan 2009, 4:03 pm | click here to view more

Open Question: help with emissions please all help welcome?

Air Travel Total number of flights you take per year (count a return trip as 2 flights) Number of domestic flights to UK destinations: Number of flights to Europe: Number of flights to East coast of USA: Number of flights to West coast of USA/Canada/South America: Number of flights to Middle East : Number of flights to Asia: Number of flights to Australia: Domestic Energy Use Average electricity bill: In £s (enter 0 if your electricity comes entirely from a renewable source such as solar, wind or hydro power) Paid: Average gas bill: In £s Paid: Average home heating oil bill: In £s Paid: could anyone give me the emissions for these per flight for the flight set and per pound for for the gas and electricity please every help would be greatly apreciated thanls nope but i need to find these out for my research

4 Jan 2009, 1:42 pm | click here to view more

Open Question: Chemistry ap question help please!?

A 2.00 L flask at 27 degrees Celsius contains 3.00 grams of each of the following: Ar(g) SO2(g) He(g). Answer the following questions about the gases and in each case explain your reasoning. a) which has has particles with the highest kinetic energy? b) which gas has particles with the highest average velocity? c) which gas has the highest partial pressure? d) which gas will deviate the most from the ideal behavior? e) which substance will have the highest boiling point? f) what changes in temperature and pressure will increase the deviations of every the gases from ideal behavior? Explain your reasoning carefully. If you know the answers and can explain how you got them that would be a lot of help! Thanks!!

4 Jan 2009, 1:23 am | click here to view more

Open Question: A mystery element worksheet a lot shorter.?

I need to know G M N O and P G H and I belond to a family of very active metals, every of which react with chlorine to produce salts with the general formula XCl. G is a member of the first period to contain 18 elements. H has the highest ionization energy of the family and I has the lowest. M is a gas and has some properties similar to the other elements in both group 1 and group 7. It is a unique element in this respect. N O and P commonly form -1 ions when they combine with metals. N is a liquid and O is a nonreactive solid. P is the most reactive of every the nonmetals.

4 Jan 2009, 12:38 pm | click here to view more

Open Question: Beach reads for 20-somethings?

Hello! I adore going to the beach in the summer but I always find myself getting bored and wasting the gas money, time, and energy and leaving. I like to go to the beach alone and snooze or hear to music, but this year I want to start actually staying to tan and relax. I was wondering if anyone knew of any exciting books that I could read on the beach. I'm 20 years old, and I adore the whole romantic, sex, reading about alcohol and drug addiction genres. (sounds bad once I write it! lol) Let me know! Thank you!!

4 Jan 2009, 12:36 pm | click here to view more

Open Question: A Mystery Elements worksheet?

Ok I got A Neon B Helium C Xenon D Argon E Oxygen F Arsenic G H Krypton I Potassium J Calcium K Magnesium L Radon M N O P Q Chlorine R Sulfur S Silicon T Aluminum U Copper V Mercury W Iron X Silver or Gold Y Uranium Z Mendelevium off this worksheet..... A, B, C, and D belong to a family, the members of which are every gases. a is commonly used in advertising signs. B was first discovered on the sun and is used in weather ballons. C was used to make the first compounds of this group. D is the family member which is gift in the largest amount of air. E and F are members of a family containing both gaseous and solid elements. E forms a diatomic molecule and is the major constitute of the atmosphere. element F is a dangerous posion and a metalloid. G H and I belond to a family of very active metals, every of which react with chlorine to produce salts with the general formula XCl. G is a member of the first period to contain 18 elements. H has the highest ionization energy of the family and I has the lowest. J K and L belong to the same family and are every metals. A compound of J is a major component of bones and teeth. K is commonly used in flash bulbs for producing light. L is a radioactive element discovered by Marie Curie. M is a gas and has some properties similar to the other elements in both group 1 and group 7. It is a unique element in this respect. N O and P commonly form -1 ions when they combine with metals. N is a liquid and O is a nonreactive solid. P is the most reactive of every the nonmetals. Q R S and T are in different families but the same period. Q is a gas used for water purification. R is a yellow non-metallic solid. S id a metalloid used in transistors. t is a metal of low density used in aircraft construction. U V W and X and every transition elements. U is an excellent conductor of heat and electricity and is commonly used in wiring and cookware. V is the only metal that is a liquid at room tempurature. W is the metal which is produced in the largest quantity. Although once used in coins, x is now used in mostly expensive jewlery. Y is an actinide fuel used in nuclear reactors. Z is the actinide named for the creator of the periodic table. unfortunatly I can not figure out the relax and my brain hurts. Can anyone please help me. I know it is a lot of work but I just don't know.

4 Jan 2009, 12:26 pm | click here to view more

Open Question: help with chemistry project?

okay, so we have this chem project we were supposed to do over break, but I procrastinated and theres school tomorrow. Part of the project is finding what it wants in household items (like bleach). no item used more than once does anyone know what any of them are (it's not a specified item) dilute acetic acid a solid hydrocarbon 2-propanol some NaHCO3 a polymer an acid-base indicator (not from lab or pool kit) a salt of element 12 a sample from a commercial mixture containing elements 7, 15, and 19 a material made primarily of cellulose some carbonic acid silicon dioxide an inert gas a solution with a pH below 7 a substance with a density less than 1.0g/mL an element whose atoms contain three electrons in the 3rd energy level a solution of NaCl an ingredient's label from a food product that contains EDTA a metal with common valences of 2+ and 3+ some calcium carbonate some sucrose a product of oxidation an element with 29 electrons a substance containing sodium fluoride a substance contaning sodium lauryl sulphate a substance containing only elements 1 and 8 thanks for your time!

4 Jan 2009, 12:01 pm | click here to view more

Open Question: which one is more logical... mass balance or energy balance? may i have email of oil field trash id and wings?

If i receive 5000 barrels of condensate, how much natural gas was transformed into this condensate.? Gas into condensate. Thanks every for responding me. but let me be a lil more clear. i belong to a gas utility ? i do have every the analysis of gas and condensate.. but i dono the methodology to receive the equivalent of gas in MCF to barrels of condensate collected. actually the gas is travelling in a transmission pipeline about 100 KM long. the natural gas is supplied to enroute towns. the distribution pipelines may have some underground leakages. what i exactly want to know the quantity of un-accounted for gas and i want to take into account the condensate collected also and want to convert into quantity of natural gas to make an equation of in and out in our network... (may be shrinkage term is ok?) whats the volumetric and heat content conversions of natural gas into condensate.. which one is logical.. any example around the world for such conversions? plz respond

4 Jan 2009, 11:07 pm | click here to view more

Open Question: How should I register? Republican or Democrat? I’m interested in a career in politics?

I am still young and confused about how I should register. Here are my views. After you tell me what I should register as can you tell me if you would ever support me in an election. I believe in lower taxes, I agree with a flat income tax and a flat sales tax. I also support a sales tax holiday to last thru the month of December to boost buying. I think that lower taxes and ax breaks should be used as incentives for companies to arrive back to the US and so that tiny businesses and entrepreneurs have a fair shot. I am a believer in capitalism with some regulation (health benefits, workers comp, and work hours obviously). I think that a good program would be a tiny business bond program where average Americans can lend money to government in secured loan with interests, so that that money can then be lent to tiny businesses but lenders would receive money back with interest. I also believe that taxes should not control behavior but instead should be used as a way to receive revenue. On social issues. I believe that a civil union for any two consenting adults is a must but am opposed to calling it marriage because marriage is a religious ceremony. When it comes to abortion I strongly oppose it and believe that government money should not be used to fund abortions. I do believe though that it must remain legal but that people that do it should do it with their possess money. I oppose GOVERNMENT funding of stem cell research and cloning. On foreign policy. I am against entangling alliances and I believe that our military resources should be used only for self-defense (Ex. 9/11). I also have my possess philosophy called “western-hemispherianism”, where I think that the US should its private sector should instead negotiate and create jobs in the western hemisphere rather than in eastern countries like China and India. Doing so would weaken our political enemies and bring an end to the immigration crisis (the biggest reason why people migrate is lack of jobs). On that note I am strongly against illegal immigration. I support raids and deportation and the construction and investment in more border security. I believe in protectionist policies (tariffs) against companies that have jobs in eastern countries. On social security I oppose it except for helping those with disabilities and widows. I do not believe that retirees should be supported by the government but that they should rather have personal responsibility and keep for the future. They should be able to use their money to invest how over they like. When it comes to welfare I believe that irresponsible parents and people who do not seek a job or an education. Welfare should be used and not abused. On energy I believe in investing in nuclear, clean coal, geothermal, solar, natural gas, bio-fuels, and the exploitation of OUR fossil fuels. I believe in energy independence. When it comes to health I think that workers should be able to pick to keep their possess health insurance thru their jobs, purchase on their possess. I also support legislation where hospitals and clinics can enlist their services in a database and where they promise to provide services to families that can prove that they have a wage of below $50,000. In exchange I would promise the hospital an annual $1 billion and clinics $4million (excludes cosmetic procedures and abortions). I support cancer research and AIDS research as well as autism research. Finally!Education. I think that the system needs to go through some serious reform. Teacher’s abilities should be tested by their respective states. States should also make legislation to not allow cell phone access in schools. They should also make contracts with internet service providers to make sure that every schools have access to the internet and that students have their textbooks. I am also a supporter of the voucher program for students who wish to apply for alternative schools. I also wish we had a program where students who graduate college/apprenticeship for example can receive a $1500 bonus after they graduate. I also think that cities should create local workshops paid by the government where students can go to and receive tutoring free of charge by college students in certain fields (mathematics,literature). This could count as work study for college students while at the same time prepping elementary and high school kids. AND OF COURSE PARENTS MUST DO THEIR PART! sure unka dano

3 Jan 2009, 9:48 pm | click here to view more

Open Question: I need to stay up all night but how?

Ok, i have 2 projects due on tuesday. I want to stay up every night to receive it out of the way. I cant steer and i have no energy drinks... Its 6:34 pm now and i realy need to start on one of them the other is almost done. I can sneak out but what should i do? Im about a mile away from a gas station...HELP ME! Its super muggy out and i can only receive out from my sisters room. I told he that she was going but shez gunna be asleep and her window is a 3 or 4 ft drop! I knocked the screen out and it fell down so im gunna try to receive some bukets from out neighbors yard and vuala anything else.

3 Jan 2009, 7:38 pm | click here to view more

Open Question: AP CHEM HELP PLEASE!!! question 2?

im totally lost. can someone please answer this question for me? THANK YOU SO MUCH!! A 2.00 L flask at 27 degrees C contains 3.00 grams each of Ar(g), SO2(g), and He(g). 1) which gas has particles with the highest average kinetic energy? 2) which gas has particles with the highest average velocity? 3) which gas has the highest partial pressure? 4) which gas will deviate the most from ideal behavior? 5) which substance will have the highest boiling point? 6) what changes in temperature and pressure will increase the deviations of every the gases from ideal behavior?

3 Jan 2009, 7:27 pm | click here to view more

Open Question: An example of a fossil fuel is ________.?

A. ethanol B. natural gas C. biomass D. solar energy

3 Jan 2009, 7:13 pm | click here to view more

Open Question: What type of energy conversion is taking place when natural gas is burned?

A. chemical into heat B. heat into mechanical C. mechanical into light D. light into chemical

3 Jan 2009, 7:02 pm | click here to view more

Open Question: Chemistry Question (science) ?

Given the formula: "C(s) + O2 (g) ---> CO2 (g) Solid Carbon burns in Oxygen gas to produce Carbon Dioxide gas." According to this reaction, should energy be be considered a reactant or product?

3 Jan 2009, 6:58 pm | click here to view more

Open Question: When 11.0 gram of propane gas, C3H8, is burned at 25 degrees celsius and 1.00 atm, H20 and CO2 are formed with?

When 11.0 gram of propane gas, C3H8, is burned at 25 degrees celsius and 1.00 atm, H20 and CO2 are formed with the evolution of 554kj. What amount of energy is evolved in a reaction between 4.8 grams of propane and 8.00 grams of oxygen? Provide the ^H for the reaction wherein 6.5 grams of propane is made from the raw material of carbon dioxide and water. Show every steps please. Thanks!

3 Jan 2009, 11:33 pm | click here to view more

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