Chemistry - March 2007

speed of light=3.00*10^8 m/s
1km=.6214 miles
assume there are 365 days in one year

2007-03-28 10:08:24 · 8 answers · asked by ♥ReKa♥ 2

2007-03-28 10:07:41 · 4 answers · asked by Anonymous

I'm just curious. I haven't come into contact with it or anything. I'm just writing a story on it.

2007-03-28 10:07:35 · 4 answers · asked by locke_boxman 1

in volts

for the following cell.


2Ag+ + Zn = 2Ag + Zn2+

2007-03-28 09:55:25 · 1 answers · asked by Anonymous

2007-03-28 09:54:04 · 1 answers · asked by Anonymous

I have two chem problems that i cant solve help please

My base is Al(ClO3)3 aluminum chlorate

I have to solve the following freezing point depression and boiling point elevation probelm.

1. Using an oppropriate solvent (and the correct freezing point depression constant for the solvent), determine how many grams of solute are required to lower the freezing point of 2.00kg of the solvent by 5.00 degrees Celcius. (remeber that for ionic solutes you must multipy the effect by the number of ions that dissociate in solution).

2. Using an appropriate solvent (and the correct boiling point elevation constant for that solvent), determin how many grams of solute are required to raise the boiling point of 2.00kg of the solvent by 5.00 degrees Celcius. (remeber that for ionic solutes you must multiply the effect by the number of ions that dissociate in solution).

PLEASE HELP ME!!

2007-03-28 09:51:56 · 2 answers · asked by mitchel l 2

2007-03-28 09:47:57 · 4 answers · asked by ray 1

2007-03-28 09:44:32 · 1 answers · asked by a 1

I have two chem problems that i cant solve help please

My base is Al(ClO3)3 aluminum chlorate

I have to solve the following freezing point depression and boiling point elevation probelm.

1. Using an oppropriate solvent (and the correct freezing point depression constant for the solvent), determine how many grams of solute are required to lower the freezing point of 2.00kg of the solvent by 5.00 degrees Celcius. (remeber that for ionic solutes you must multipy the effect by the number of ions that dissociate in solution).

2. Using an appropriate solvent (and the correct boiling point elevation constant for that solvent), determin how many grams of solute are required to raise the boiling point of 2.00kg of the solvent by 5.00 degrees Celcius. (remeber that for ionic solutes you must multiply the effect by the number of ions that dissociate in solution).

PLEASE HELP ME!!

2007-03-28 09:37:21 · 1 answers · asked by mitchel l 2

Help i have a chemistry assignment due tom. and i cant solve any of these probelms that i ihave left.

Can you please help with these four?

My base is Al(ClO3)3 aluminum chlorate

How many grams of the compound would need to be dissolved in 750ml of the solvent to make a 2.5M solution?

What is the molarity of a solution containing 355 grams of solute in 1550ml of solution

What is the molality of a solution containing 15.0 grams of solute mixed with 55.0 grams of solvent.

How many grams of the compound would need to be dissolved in 5500grams of solvent to make a 17.5m solution.

PLEASE HELP ME THANKS IF YOU CAN!

2007-03-28 09:30:12 · 1 answers · asked by mitchel l 2

Propane C3H8(g) can be burned in pure oxygen to give only carbon dixoide and water.


When the equation is properly balanced with the smallest ratio of integer coefficients, which of the following statements are true ?
(For statement e, assume the amount of given reactant reacts completely.)



a) The coefficient of propane is 1

b) The coefficient of oxygen is 3

c) The coefficient of carbon dioxide is three times that of propane

d) The coefficient of water is four fifths that of oxygen

e) 3 mole of oxygen produces 2 mole of carbon dioxide

f) 2.50 mole of oxygen reacts with 0.25 mole of propane

2007-03-28 09:24:32 · 5 answers · asked by Anonymous

Reaction:
NH3 + O2 --> NO + H2O


how many grams of NH3 are needed to completely react with 64.00 g of O2

2007-03-28 09:21:30 · 2 answers · asked by Anonymous

Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is:
C2H2(g) + 2H2(g) === C2H6(g)

Given the following, what is the Kp for the reaction?

C2H2(g): 209.2 ΔG˚f (kJ/mol)
H2(g): 0 ΔG˚f (kJ/mol)
C2H6(g): -32.89ΔG˚f (kJ/mol)

ΔG˚ = -RTlnK
ΔG = ΔG˚RTlnQ

2007-03-28 09:05:32 · 1 answers · asked by Anonymous

2007-03-28 09:03:40 · 5 answers · asked by ladona c 1

What will make my uncovered paperclip rust? about how long will it take to rust?


Thanks
Mr. J

2007-03-28 09:02:21 · 4 answers · asked by Anonymous

And is iodized is good for you and a necessary nutrient, Why isn't all salt iodized?

2007-03-28 09:01:13 · 2 answers · asked by Former Republican 2

A sample of oxygen is collected in a 175 mL container over water at 15 degrees C, and the barometer reads 752.0 torr. What volume would the dry gas occupy at 770.0 torr?

2007-03-28 08:58:14 · 1 answers · asked by Matt R 1

2007-03-28 08:57:43 · 4 answers · asked by Anonymous

In this equation, H3PO4+3NaOH-->Na3PO4+3H2O, I have to find out how much NA3PO4 can be prepared by the reaction of 4.7g of H3PO4 w/ an excess of NaOH.
How do I know how many moles I have to start the conversion factors?

2007-03-28 08:55:55 · 2 answers · asked by Spideyluvr 1

Everything lines up so neatly. protons,neutrons...even the electrons act in predictable ways

2007-03-28 08:53:03 · 6 answers · asked by sdr35hw 4

Part of the process by which coal can be converted into a combustible mixture of gases involves passing steam over white hot coke:

H2O (g) + C (s) = H2 )g + CO (g); ΔH = +131 kJ mol^-1

When steam was passed over coke at 730°C, the following partial pressures were measured at equilibrium:

p(H2O) = 90 kPa
p(H2) = 183 kPa

State what the equilibrium partial pressure of carbon monoxide is and hence calculate the equilibrium constant.

I'm pretty much able to write the expression for Kp - the equilibrium constant and suchlike, but I'm confused as to how to find both the PP of CO at equilibrium and the equilibrium constant when they're both unknowns, the way I see it. A little help, please? Thank you. :)

2007-03-28 08:50:18 · 1 answers · asked by kimiessu 2

2007-03-28 08:48:26 · 7 answers · asked by Shannon R 2

2007-03-28 08:47:48 · 2 answers · asked by jb21546 1

Regarding cleaning the carbon residue off the glass after burning wood.
I am having trouble finding the right cleanning product to clean the black carbon off the transparent (now dark black) glass window in which you can see through. It's just the fact, i cant see what's going on inside the hearth while the fire is going!!

Any one know a solution of any kind, or a commercial product that can clean the glass windows on the hearth door??

2007-03-28 08:17:39 · 4 answers · asked by bio c 2

2007-03-28 08:17:12 · 2 answers · asked by Anonymous

GIVEN- 3Ag+4HNO3=3AgNO3+NO+2H20
whats limiting reactant

please help me.i dont know the steps in doing this.

2007-03-28 08:12:02 · 2 answers · asked by molly 1

Stuck At Homework

2007-03-28 08:02:58 · 7 answers · asked by Anonymous

__ K2Cr2O7 + __ C2H6O + __ H2SO4 >>> __ Cr2(SO4)3 +__ K2SO4 + __C2H4O2 + ___ H2O

That is the equation. I havent been able to get his for a couple weeks and it is really starting to bug me. I hope you can read it. The bigger numbers are the subscripts. I hope this does not make it to confusing. Thanks You SOOO much!

2007-03-28 07:48:53 · 3 answers · asked by Amanda A 2

2007-03-28 07:48:41 · 1 answers · asked by Anonymous

I know there are different variations to iodine clock reactions but for example, will a hydrogen peroxide reaction, regardless of the concentrations of the chemicals you're using, give the same rate equation (and overall order of reaction)?

2007-03-28 07:48:12 · 1 answers · asked by skye 1