Chemistry - June 2007

when 10 g of zinc and 8 g of sulfur are allowed to react, all the zinc is used up, 14.9 g of zinc sulfide is formed and some unreacted sulfur remains. the mass of unreacted sulfur is___
My answer is 3.1 g
book answer is 4.9 g

2007-06-27 08:57:39 · 3 answers · asked by soulsearching 2

Explain why only one hydrogen atom is acidic in KHP...

2007-06-27 07:55:21 · 4 answers · asked by af_woody1892 1

what is pollenatation

2007-06-27 07:54:13 · 4 answers · asked by Anonymous

2007-06-27 07:52:53 · 2 answers · asked by louie 2

If you could, please apply it to this question:

b. Explain in a paragraph why (and how) liquid mercury could be vaporized.
c. The freezing point of Hg is -38.87 degrees C; does crystalline Hg exert a vapor pressure? Is the vapor pressure of Hg(l) larger or smaller than that of Hg(g)? Hg(s)?

For b, it is my understanding that when a liquid has great pressure, it vaporizes. Is this correct?

2007-06-27 07:28:56 · 2 answers · asked by Anonymous

2007-06-27 06:38:27 · 6 answers · asked by kaylani_kay 1

2007-06-27 05:32:43 · 10 answers · asked by Anonymous

Since when temps. rise, solids become more soluable in water and gases become less soluable in water. If my soft drink has high concentrates of sugar and carbon dioxide what would be expected to happen?

Will sugar participate out?
Gas bubbles form and produce form?
Water evaporates rapidly?

Or, a combination of these answers? I know it can't be water evaporates rapidly only.

I am so confused!! Please help.

2007-06-27 04:13:33 · 6 answers · asked by chicalinda 3

2007-06-27 03:25:41 · 5 answers · asked by Anonymous

based on our experiment, combining 2 mL water & 6mL acetone will not gain 8mL liquid

2007-06-27 01:29:22 · 3 answers · asked by jaryllechu 2

2007-06-27 01:20:11 · 2 answers · asked by varija 1

2007-06-27 01:11:43 · 3 answers · asked by jazztynn d 1

pls explain?

2007-06-27 01:06:38 · 16 answers · asked by Anonymous

2007-06-27 00:54:07 · 4 answers · asked by Ging-ging 1

inorganic compounds like HCL. .

2007-06-27 00:30:47 · 1 answers · asked by lime 1

I have a test but cannot find answer for this. help thx!

1. A gas of unknown molecular weight is found to diffuse at a rate of 0.19cm/s compared to 0.59 cm/s for helium gas. Calculate the molecular weight of the unknown gas.

2. Which of all of the possible gases should have the highest rate of diffusion?

3. A balloon inflated with helium gas will rise to the ceiling of a room. However, after a certain period of time, the balloon will descend to the floor. Why does the balloon eventually descend?

4. If the cork containing the concentrated NH3(AMMONIA) solution were inserted into the glass tube several seconds after the insertion of the cork containing HCl, what effect would this have on the calculated value of the molecular weight of HCI???

2007-06-26 21:09:22 · 4 answers · asked by Anonymous

Water at 25 celcius has a density of 0.997 g/cm3. Calculate the molality and molarity of pure water at this temperature.

Is it just me or am I lacking bits of information to solve for the molality and molarity! help!!

2007-06-26 19:02:57 · 4 answers · asked by Anonymous

2007-06-26 17:00:37 · 7 answers · asked by paliden142 2

2007-06-26 16:07:52 · 5 answers · asked by Nick 1

2007-06-26 15:51:13 · 4 answers · asked by shell 1

2007-06-26 14:50:11 · 9 answers · asked by shell 1

The question I am working on is as follows:

Write balanced half-reaction equations for the processes that occur at the anode and cathode when an aqueous solution of potassium chloride is electrolyzed. Identify the oxidizing agent and reducing agent. Calculate the number of kilowatt-hours of energy required to produce 2.00 kg of chlorine gas if the voltage applied is 4.8 V and the current is 3.5 x 105 amps. (1 kwh = 3.6 x 106 J)

I know that I am going to have the half reactions for Chlorine and water..but I am not sure by what it means when the question states that potassium chloride is "electrolyzed." does this mean that the Chlorine half reaction is for the cathode? And thus, the Chlornie will act as the oxidizing agent since it will be reduced? Argh I'm so confused! Can someone please help me? Thanks in advance :D

2007-06-26 14:14:37 · 3 answers · asked by Anonymous

2007-06-26 13:38:48 · 8 answers · asked by Anonymous

What are some funny chemistry jokes you can tell to a teacher?

not to be a suck-up lol don't worry.

2007-06-26 12:15:26 · 9 answers · asked by Anonymous

What factors influence the Rf value of an organic compound.
(there could be more than one options)

1)Polarity of the solvent.
2)Polarity of the compound.
3)Time and/or temperature during the development of the plate.
4)Molecular weight of the compound.
5)Length of the TLC plate.

anyone has any idea?thank you

2007-06-26 10:31:52 · 5 answers · asked by ichigokun 1

1. If the Ka of CH3COOH is 1.8 x 10^ -5, what is the Kb of CH3COONa?


2. Give the lewis acid and base in the left side of the equation: FeBr3 (s) + Br- = FeBr4-

3. Give the acid-base neutralization reaction that produces the salt NH4Cl.

I would appreciate help,

Thanks.

2007-06-26 10:26:40 · 2 answers · asked by Anonymous

nitrobenzene is produced from a reaction mixture of conc. sulphuric acid and conc. nitric acid, which give rise to the nitronium ion. so by electrophilic substituion into the benzene ring, nitrobenzene is produced. if this reaction mixture was heated, what other products beside nitrobenzene would be produced? thnx.

2007-06-26 09:57:50 · 3 answers · asked by new_man_321 1

a. Zero Order
b. first order
c. second order
d. none of them

2007-06-26 09:52:07 · 3 answers · asked by nismo man 1

1. Hg2I2
2. AuCl3
3. Cl2O7
4. P2O3
5. AlCl3

2007-06-26 09:18:33 · 10 answers · asked by Cybelle 1

Am I right?

"The more slowly a gas increases temperature/pressure, the closer the estimate absolute value will be to the theoretical absolute value."

If I'm not, please correct me. Thanks in advance! :)

2007-06-26 09:11:05 · 3 answers · asked by sillysalamander101 2