Number of results: 521
Hi, can you please help me with these questions. Methane and chlorine react when irradiated with UV light. Explain why the reaction requires only a little flash of UV light rather than prolonged radiation. Explain each of these observations as fully as you can. 1.
Wednesday, July 26, 2006 at 11:22am by Ishani
How many times did Earth orbit the sun between 140 CE and 1543 , how do you figure this up???? If you know how many years that is, the earth orbits the sun once a year. I hope this helps. Thanks for asking. How many years is 140 Ce to 1543 ?? We need to know 10 different kinds...
Tuesday, September 5, 2006 at 8:18pm by Charlotte
When 16 grams of methane gas combine with 64 grams of oxygen, 44 grams of carbon dioxide form, plus water. What mass of water is produced? You can work this problem as a stoichiometry problem OR you can recognize that the law of conservation of mass tells us that the mass on ...
Sunday, October 1, 2006 at 4:16pm by Bryan
i was practicing some advanced level questions and i came across this one On heating with soda lime, sodium ethanoate decomposes in accordance with the following eqn CH3COONa + NaOH ----> CH4 + Na2CO3 iF 8.2g of sodium ethanoate produced 560 cm^3 of methane (at stp (...
Wednesday, November 15, 2006 at 6:45pm by Kim
can a compound's empirical and molecular formulas be the same?Explain who cares? Yes, they can. CH4 is methane. That is the empirical formula as well as the molecular formula.
Monday, January 15, 2007 at 11:44pm by amanda
What is the chemical equation for the combustion reaction between methanol and air? CH4 + O2 ==> CO2 + H2O. All hydrocarbons produce CO2 and H2O when they are combusted in air. The above equation isn't balanced. I assume you can do that? If not, ask OR take a shot at it and...
Thursday, January 18, 2007 at 10:28pm by Raj
what are some examples of covalent bonds and what are some examples of ionic bonds? Electrons are shared in covalent bonds. Electrons are exchanged in ionic bonds. Typical ionic compounds are NaCl, MgCl2, LiI, etc. Typical covalent compounds are CH4, methane; C2H6, ethane; ...
Monday, January 29, 2007 at 7:26pm by Leeann
Classify each of these statements as always true, sometimes true, or never true. 7____AT____It is necessary to know the formula of a compound in order to calculate its percent composition. 8___ST_____If the percent by mass of carbon in methane, CH4, is 75%, then 100 grams of ...
Sunday, February 11, 2007 at 3:48pm by Bryan
which of the following is a chemical reaction? A) propane forms a flame and emits heat as it burns. B) Acetone feels cold as it evaporates from the skin. C) Bubbling is observed when potassium carbonate and hydrochloric acid solutions are mixed. D) Heat is felt when a warm ...
Tuesday, February 20, 2007 at 2:04pm by Jenn
A XX-g sample of methane, CH4, is mixed with YY atm of O2 (an excess) in a VV L combustion chamber at 125.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 125.0°C. What is the final pressure in the combustion chamber assuming the ...
Sunday, February 25, 2007 at 8:34pm by Jack
The atmosphere is composed of a mixture of _______________, _____________ ____________, and tiny___________________. Thank you for using the Jiskha Homework Help Forum. The origin of our atmosphere is still open to a great deal of speculation. One theory is that the first ...
Monday, March 12, 2007 at 10:38pm by Happy
Hydrogen Cyanide (boiling temperature 26 degrees Celsius) is an important chemical for the production of nylon and various transparent plastics. It is produced on an industrial scale by the oxidation of methane in the presence of ammonia. The equation below is an unbalanced ...
Saturday, April 21, 2007 at 12:04pm by katie
Can someone check these? 1. What device, developed in 1970, is able to make images of individual atoms? 1. The X-ray crystallographer 2. The laser 3. The Brownian motion detector 4. The scanning electron microscope My answer: 4 2. Which of the following is smallest? 1. Proton ...
Tuesday, May 8, 2007 at 1:44pm by jake
My science teacher says that cattle flatulence is destroying the ozone layer. If this is true, what can we do to regulate the flatulence output of cattle in order to preserve the ozone? http://www.guardian.co.uk/climatechange/story/0,12374,905360,00.html http://www.google.com/...
Thursday, May 10, 2007 at 11:34pm by Joey
does methane have anything to do with ozone depletion? http://www.ciesin.columbia.edu/docs/011-466/011-466.html What Drainage basin does Michigan belong to? I have answered this one a couple of times already. Can I direct you to the statement in the conclusion in DrBob's ...
Tuesday, May 15, 2007 at 6:34pm by Anonymous
a mixture of 10cm3 of methane and 10cm3 of enthane was sparked with an excess of oxygen. after coolin to room temp, the residual gas was passed thru aq KOH. what volume of gas was absorbed by the alkali ? Write the equations for CH4 + O2 and C2H6 + O2. Balance them. Look to ...
Tuesday, May 29, 2007 at 1:09pm by Pet
I am refreshing on bonding and structure before starting an organic chem class. I am a bit rusty on hybrid orbitals in bonding. Take Methane, CH4, I understand each carbon has an sp3 orbital that overlaps an s orbital on the H to form its 4 bonds. In a CCL4 atom, which is also...
Thursday, August 23, 2007 at 4:07pm by AMY
what is produced when methane is burned ?
Thursday, October 11, 2007 at 12:42pm by Anonymous
In an experiment, you fill a heavy walled 5.00 L flask with methane gas, CH4. If the flask contains 7.13g of methane at 19 degrees C, what is the gas pressure. Use the ideal gas law. Can some one help me get started on this problem please
Tuesday, October 23, 2007 at 12:17am by Lauren
if you could just help me set them up the would do me some good. Thanx A. In the single reaction of chlorine and potassium bromide, how many grams of potassium chloride can be produced from 200.g each of chlorine and potassium bromide? Identify the limiting reactants. B. In ...
Monday, October 29, 2007 at 9:32pm by Monte'