Chemistry - May 2007

2007-05-12 19:10:42 · 1 answers · asked by mick f 1

If the pressure of the gas collected over water was measured to be 453.0mm Hg, what is the pressure of the pure gas?

2007-05-12 19:10:08 · 1 answers · asked by divaem 1

During photochemical reaction between K3[Fe(C2O4)3]3H20 (Ferric Potassium Oxalate) and K3Fe(CN)6, I had to Sulfuric Acid. What is the reason Sulfuric acid must be added?

2007-05-12 18:58:37 · 1 answers · asked by Anonymous

2007-05-12 18:31:08 · 4 answers · asked by arjun m 1

(1) FeSO4 + KMnO4 + H2SO4 ----> Fe(SO4)3 + H2SO4 + MnSO4 + H20

(2) CoCl2 + Na2O2 + NaOH + H20 ---------> Co(0H)3 + NaCl

(3) [Cu(NH3)4]Cl2 + KCN +H20 ----> NH3 + NH4Cl + 2[Cu(CN)3] + KCNO + KCl

(4) S + NaOH -------> Na2S + Na2SO3 + H20

(5) S + H2SO4 ------> SO2 + H20

(6) FeS2 + O2 ------> Fe2SO3 + SO2

2007-05-12 18:29:06 · 1 answers · asked by Anonymous

Hydrazine. N2H4, is used in a rocket fuel. Determine its boiling point from the following thermodynamic data.

delta H = 45.4 kJ mol-1
S N2H4(l) =121.2J mol-1 K-1
S N2H4 (g)= 238.4 J mol-1 K-1

2007-05-12 18:07:46 · 1 answers · asked by joy 1

What is the concentration of Cd2+ in a solution that is 0.10 M Cd(NH3)4 +2? (Kf =4.0x 10^6)

The answer is 1.0x10^-2 but can anyone show me the steps.Thanks

2007-05-12 18:01:33 · 1 answers · asked by joy 1

2007-05-12 16:51:39 · 6 answers · asked by Link 4

2007-05-12 15:55:24 · 2 answers · asked by no name 1

2007-05-12 15:49:03 · 2 answers · asked by jacimonkey 1

What is the % (by mass) of carbon in calcium oxalate?
a. 9.4
b. 18.8
c. 31.25
d. 34.4

2007-05-12 15:40:15 · 6 answers · asked by P 1

Use Boyles’ Law to answer the following questions:

1) 1.00 L of a gas at standard temperature and pressure is compressed to 473 mL. What is the new pressure of the gas?

2)Atmospheric pressure on the peak of Mt. Everest can be as low as 150 mm Hg, which is why climbers need to bring oxygen tanks for the last part of the climb. If the climbers carry 10.0 liter tanks with an internal gas pressure of 3.04 x 104 mm Hg, what will be the volume of the gas when it is released from the tanks?

2007-05-12 15:16:24 · 1 answers · asked by Joesph P 1

I need to find out the options for liquid metal alloys at room temperature. I've got a device with a spinning copper disc which needs to make a low resistance electrical contact via the edge of the disc being slightly dipped in a pool of liquid metal. I was going to use mercury, but since the vapor is toxic I was looking into other options so I don't have to build an air tight enclosure. One option I found was a mixture of 76% gallium and 24% indium which melts at 16° C (61° F) but I'm concerned about this alloy oxidizing and I'm also concerned that the alloy could "wet" the copper. Would these problems occur? What are the options for liquid metal alloys that will not wet the copper and not oxidize?

2007-05-12 14:08:56 · 2 answers · asked by merlock 1

I need to find the mole ratio of the following and determine which is the limiting reactant and how much of the excess reactant is left over:
.209 mole Acetic Acid
.172 mole Ethyl Alcohol

2007-05-12 13:21:19 · 4 answers · asked by Anonymous

2007-05-12 13:09:27 · 2 answers · asked by what ever ? 2

2007-05-12 13:07:14 · 2 answers · asked by Anonymous

2007-05-12 12:48:35 · 2 answers · asked by Anonymous

draw the lewis structure and indicate the direction of the bond dipole for these two single bonds: C-I and P-Se

2007-05-12 12:03:50 · 2 answers · asked by love2nnelly 1

Hello everyone, I am having some trouble with my homework.

"From the volume, temperature, and pressure data given, calculate the number of moles and the mass in grams for each gas listed using the ideal gas equation.

a. 2000.0 cm^3 NH3 at 10.0 degrees C and 105.0 kPa"

2007-05-12 12:03:18 · 4 answers · asked by hacksigntom 2

If you had added 50mL of water to a sample of KHP instead of 30mL, would the titration of that sample then have required more, less or the same amount of base? EXPLAIN.

2007-05-12 11:29:31 · 3 answers · asked by ♥ ♥ ♥ 2

Formic Acid or HC(O2)H loses one proton upon ionization and has a dissociation constant of 1.8 times 10^-4.

a. Calculate the pH of a solution made by adding 2.0 times 10^-2 mole of formic acid to 1.50 liter of solution.

Please show work and explain (after showing work)

2007-05-12 10:43:39 · 2 answers · asked by thekrimson 1

How is it possible for a halogen lamp to operate with the filament at 2700 degree Celsius when the tungsten would normally decompose/oxidize at this high temperature?

2007-05-12 10:07:53 · 3 answers · asked by Anonymous

2007-05-12 09:26:31 · 1 answers · asked by Tejas J 1

2007-05-12 09:17:57 · 1 answers · asked by Anonymous

2007-05-12 09:11:09 · 6 answers · asked by Giggly Giraffe 7

2007-05-12 08:56:35 · 4 answers · asked by Giggly Giraffe 7

Death Valley (below sea level)

Miami (at sea level)

Denver (above sea level)

2007-05-12 07:50:45 · 2 answers · asked by Anonymous

2007-05-12 07:45:49 · 4 answers · asked by Francisco P 1

http://learn.flvs.net/webdav/assessment_images/educator_chem/pictures/Che6q11.gif


a. energy of reactans
b. energy of products

2007-05-12 07:12:03 · 2 answers · asked by Anonymous

2007-05-12 06:16:57 · 1 answers · asked by sudan_suda 1