Chemistry - July 2007

I have a bottle of 6% vinegar. If I leave the cap off, will water evaporation make the acetic acid percent increase? Or will the acetic acid evaporate along with the water?

2007-07-26 06:07:31 · 3 answers · asked by Marvin 1

2007-07-26 06:05:29 · 4 answers · asked by Anonymous

im doing a lab with an experiment called "acid atttack" Its about what would happen if we put chalk in vinerger and limon juice ....would it dissolve....what the chimistry behide it ....need to know by friday....thanks

2007-07-26 06:04:06 · 6 answers · asked by the one and only 2

Compact Fluorescent Lights (CFC)
Incandescent*
LED (Light Emitting Diodes)
Halogens*
Metal Halides*
Sodium*

2007-07-26 05:54:45 · 5 answers · asked by neoslan 2

If you eat a 6oz can (180g) of tuna with ~.2 ppm Hg, how much mercury do you ingest?

2007-07-26 05:17:53 · 2 answers · asked by Anonymous

tell me somethying about red mercury .what sort of thing is it. is it really exist or not.

2007-07-26 03:23:15 · 3 answers · asked by rana 1

I am trying to destroy several boxes of old financial statements. Too many to shred and I don't have an easy/safe way to burn them. A liquid shredder/dissolver might be just the ticket.

2007-07-26 02:08:58 · 4 answers · asked by Anonymous

to miss laroa

2007-07-26 00:28:25 · 5 answers · asked by Anonymous

i know carbon monoxide sinks, what about co2?

2007-07-25 23:57:31 · 12 answers · asked by baby jesus 2

2007-07-25 19:36:56 · 2 answers · asked by Pathi kanth 1

2007-07-25 19:26:49 · 3 answers · asked by .............. 1

2007-07-25 19:14:01 · 1 answers · asked by John P 2

Just curious. Already seen wikipedia so please don't use it. Though I appreciate opinions, I value facts more (so make use of the space for your source) Thanks!!!!!!!!

2007-07-25 19:09:36 · 5 answers · asked by Anonymous

The combustion of titanium with oxygen produces titanium dioxide:

Ti(s) +O2(g) yields TiO2 (s)

When 0.071g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 degrees C to 53.80 degrees C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.98KJ/K. The heat of the reaction for the combustion of a mole of Ti in this calorimeter is....

2007-07-25 18:38:23 · 1 answers · asked by Anonymous

The vaule for delta H degree for the reaction below is -336KJ. Calculate the heat (KJ) released to the surroundings when 23.0g of HCl is formed.

CH4(g) + 3Cl2 (g) yields CHCl3(l) +3HCl (g)

Please show your work.

2007-07-25 18:24:36 · 1 answers · asked by Anonymous

CH4 + 3Cl2 ----> CHCl3 + 3HCl
^H degrees for the reaction is -336KJ. How do you calculate the heat when 23.0g of HCl are formed?

2007-07-25 18:20:33 · 2 answers · asked by Matthew H 2

2007-07-25 18:19:51 · 1 answers · asked by Anonymous

Using the data which follows, the delta H(sub F)degree for C2H6(g) is...?

2C2H6(g)+7O2(g) yields 4CO2(g) +6H2O(l) deltaHdegree= -3120 KJ/Mol
C(s)+Os(g) yields COs(g) delta Hdegree=-394 KJ/Mol
2H2(g) +O2(g) yields 2H2O(l) deltaHdegree=-372 KJ/Mol




The ____________is the amount of heat required to raise the temperature of one gram of a substance by 1 degree C.



The term for all forms of energy associated with the specific amount of a substance is____________.




Please answer all three questions! Thanks guys!

2007-07-25 18:01:20 · 1 answers · asked by ~daweed~ 3

I seen it on the web but just wanted to know what it is.

2007-07-25 18:00:42 · 3 answers · asked by jesse6317 2

Aerobic respiration, or the process by which animals use energy by breaking down glucose in the presents of oxygen, is described by the equation:

C6H12O6+O2>>>CO2+H2O

Balance the equation.

Calculate how much carbon dioxide is exhaled if an animal inhales 32.0 gO2

What is the source of the glucose and oxygen?

2007-07-25 17:58:33 · 3 answers · asked by Anonymous

The reusable booster rockets of the space shuttle use a mixture of aluminium and ammonium perchlorate as fuel. An equation for the reaction is:

3Al (s) + 3NH4ClO4 (s) --> Al2O3 (s) + 3NO (g) + 6H2O (g) + 2677 kJ

Calculate how much heat is released when the following quantities of aluminium are consumed according to the above equation:

(a) 1 mol
(b) 1 kg

Please help me work out this question because I don't know how to do them...THANKS! :)

2007-07-25 17:53:56 · 3 answers · asked by ♥ Victory ♥ 3

Mg + 2HCl ---> MgCl2 + H2
What volume of hydrogen at STP is produced from the reaction of 50.0g of Mg and the equivalent of 75g of HCl?
How much of the excess reagent in last problem is left over?

thanks in advance

2007-07-25 17:48:16 · 3 answers · asked by playpwnsu 2

2007-07-25 17:40:56 · 2 answers · asked by Anonymous

Explain the statement like dissolves like?

2007-07-25 17:38:03 · 2 answers · asked by Anonymous

2007-07-25 17:27:04 · 5 answers · asked by Anonymous

For each of the following processes: state whether it is exothermic or endothermic, identify whether the reactant or products have the higher enthalpy, and state whether heat would be released to or absorbed from the surroundings.

(a) burning kerosene
(b) melting ice
(c) condensing steam at 100 degrees Celsius

And could you please give reasons as well...thanks! :)

2007-07-25 17:14:47 · 5 answers · asked by ♥ Victory ♥ 3

curie
rad
rem
roentgen

2007-07-25 13:03:35 · 3 answers · asked by Anonymous

What is the pH of a 1.00 x 10–9 molar solution of HCl?


9
5
6
6.8
7


And its not 9 or 5. Please list how this is solved. Thanks.

2007-07-25 12:43:11 · 5 answers · asked by Anonymous

what are the results (PH acid is used in most soft drinks)

2007-07-25 12:30:07 · 4 answers · asked by Anonymous

I am currently doing limiting reagent and excess part of it, and i have trouble, with calculating here is the question

N2 + 3H2 ---> 2NH3
How many grams of NH3 can be produced from the reaction of 28g N2 and 25g of H2?

I did 25g divide 2g = 12.5mols then divide by 3= 4.17mols
28g divide by 28g = 1 mol then divde by 1= 1 mol
so 1 mol is limiting and the 4.17 is excess
i use 1 mol times 2NH3 divide by 1 N2 = 2 mols x 17g = 34g of NH3
then the second part asks How much of the excess reagent in problem 1 is left over?
im assuming thats the 4.17mols, and i cannot find how to figure it out, becuase my answers does not match the answer on back of book..so please someone help, thanks

2007-07-25 12:17:41 · 2 answers · asked by playpwnsu 2