Chemistry - November 2007

Calculate the amount of heat transferred when 44.0 g of CH_3OH (g) is decomposed by this reaction at constant pressure.

Find Delta H which will be in kJ.

CH3OH --> CO + 2H2 for reaction Delta H +90.7 kJ

2007-11-21 20:59:57 · 2 answers · asked by hobiesailor07 1

2007-11-21 19:56:00 · 1 answers · asked by connie m 1

ok what is the bfe and net ionic for the reaction of AgCl and HCl?

how about the reaction of phosphine gas and boron trifluoride gas?

2007-11-21 19:22:42 · 1 answers · asked by missingfeet 2

Methanol, CH3OH, is sometimes used as an antifreeze for the water in automobile windshield washer fluids. How many grams of methanol must be added to 5.08 kg of water to lower its freezing point to -15.0°C? For each mole of solute, the freezing point of 1 kg of water is lowered 1.86°C.

2007-11-21 18:20:31 · 1 answers · asked by Anonymous

2007-11-21 17:15:37 · 4 answers · asked by Anonymous

2007-11-21 17:09:39 · 7 answers · asked by resp2srv 1

Neglect overpotential and determine the minimum potential required to electrolyze molten CrCl3.
Possible answers: 0.8V, 1.1V, 1.4V, 1.7V, 2.0V, 2.3V

b)How grams of Cr would be deposited and
c)how many liters of Cl2 gas would be produced at 184 degree C and 1.09 atm by passing a current of 26.0 A for 16.0 hrs?

2007-11-21 17:01:58 · 1 answers · asked by Anonymous

Use the following cell to answer the questions:

Cr / Cr3+ (1.00 M) // Ni2+ (1.00 M) / Ni.

a) How many milligrams of Ni would be plated on the cathode if a current of 0.37 A is drawn for 3.5 hrs?
b) What is [Cr3+] when [Ni2+] has dropped to 10-4 M?
c) What is the cell potential at the conditions described in Part b?

2007-11-21 16:57:23 · 1 answers · asked by Anonymous

2007-11-21 16:12:08 · 7 answers · asked by Anonymous

Consider the following system at equilibrium: A(aq) B(aq) <--->2C(aq)
Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or no shift in the direction of the net reaction.
Increase [A], Increase [B], Increase [C], Decrease [A], Decrease [B], Decrease [C], Double [A] and halve [B], Double both [B] and [C].

2007-11-21 16:09:34 · 5 answers · asked by Anonymous

2007-11-21 15:38:34 · 3 answers · asked by lolly 3

Arrange the acids
I) phosphorous acid (H3PO3),
pKa1 = 2.00;
II) hydrogen selenate ion (HSeO¡
4 ), pKa = 1.92;
III) selenous acid (H2SeO3), pKa = 2.46;
IV) phosphoric acid (H3PO4), pKa = 2.12;
in increasing order of strengths.
1. Cannot be determined
2. IV, III, I, II
3. III, I, IV, II
4. IV, I, III, II
5. None of these
6. II, I, IV, III
7. III, IV, I, II
8. II, I, III, IV
9. II, IV, I, III
10. II, III, I, IV

2007-11-21 15:35:40 · 1 answers · asked by Jack L 1

a) C2H3O2 -(aq) is a product
b) When balanced the coefficient of KOH(aq) is 1
c) Ions cannot appear in the net ionic equation because they always cancel out on both sides of the equation
d) H+(aq) does not appear in the net ionic equation
e) K+(aq) appears in the net ionic equation

2007-11-21 15:34:51 · 1 answers · asked by Anonymous

Calculate the pH of a solution that is 0.6 M
in sodium acetate and 0.2 M in acetic acid.
Ka = 1.8 x 10-5 for acetic acid.

2007-11-21 15:34:09 · 2 answers · asked by Jack L 1

Use the following cell to answer the questions:
Cr / Cr3+ (1.00 M) // Ni2+ (1.00 M) / Ni.
a) How many milligrams of Ni would be plated on the cathode if a current of 0.23 A is drawn for 2.8 hrs?
(answer must be in mg of Ni)

b) What is [Cr3+] when [Ni2+] has dropped to 10-4 M?
(answer must be in M)

c) What is the cell potential at the conditions described in Part b?
(answer must be in V)

2007-11-21 14:56:08 · 1 answers · asked by gcnrockerchic2431 2

a) have no attraction for one another
b) have appreciable molecular volumes
c) have a molecular weight of zero
d) have no kinetic energy
e) have same exact speed

and explain thanks

2007-11-21 14:27:57 · 2 answers · asked by kp000000 1

For example why can oils be burned but not water

2007-11-21 14:18:07 · 3 answers · asked by JaeMoney 1

2007-11-21 14:15:19 · 9 answers · asked by warelock 1

Using Zaitsev's rule...

A. (E)-hex-2-ene
B. hex-1-ene
C. (Z)-hex-2-ene
D. They are all equal


I understand Zaitsev's rule, where more substituted double bonds are usually more stable, i just don't understand the nomenclature of the compounds. I've never heard of hex-1-ene before or anything like that.

Thank you.

2007-11-21 13:25:04 · 2 answers · asked by Paulllll C 3

If u can help please do............soon...

2007-11-21 12:32:53 · 1 answers · asked by sweet 2

Today in class i dont know how but me and my freind got in a debate and he said water is clear and i said it was white the question was what was the color of water by definition clear is not a color but white is and i say water is white because in the dictionary white reads as "Having No Color Or pigmitation:
Water has no color making it white.

2007-11-21 12:29:55 · 12 answers · asked by Anonymous

A 17.40-mL sample of potasium hydroxide is titrated to the stoichiometric point with 19.80 mL of 0.262 M HNO3(aq).
What is the molarity of the basic solution (potasium hydroxide) BEFORE it is titrated ?

2007-11-21 12:21:15 · 2 answers · asked by Anonymous

can u guys give me some help please... ok so i got this chemistry project, I was assigned the element selenium. and now i have to make a poster board on it(needs to be creative) and i have no idea what selenium is and everywhere i look makes no sense

2007-11-21 12:02:53 · 3 answers · asked by Anonymous

2007-11-21 12:01:02 · 3 answers · asked by Anonymous

2007-11-21 11:53:12 · 2 answers · asked by Slash_GNR 1

I was wondering if you could mold clay into a sphere then fill it with aluminum. Then put it over a fire and wait until the aluminum melts then put it in a freezer and it would come out as a sturdy, aluminum sphere. Thanks!

2007-11-21 11:44:24 · 1 answers · asked by Bryan C 1

I recently performed an amino acid experiment with chromatography paper using a mixture of ethanol, ammonia and water as the solvent in a ratio of 8:3:1. Individually the substances are polar, but are they polar mixed? is it a mixture or compound now?

2007-11-21 10:59:59 · 1 answers · asked by jabohio 2

2007-11-21 10:59:46 · 1 answers · asked by meow 1

Solid ammonium chloride is added to water in a beaker and dissolves. The beaker becomes cold to the touch.
a. Make an appropriate choice of system and surroundings and describe it unambiguously.
b. Explain why you chose the system and surroundings you did.
c. identify transfers of energy and material into and out of the system that would be important for you to monitor in your study.
d. Is the process of dissolving NH4Cl solid in water exothermic or endothermic?

2007-11-21 10:54:15 · 3 answers · asked by loone 2

if electricity costs .09 per kilowatt hour, how much does it cost per megajoule?

2007-11-21 10:44:27 · 1 answers · asked by loone 2