Chemistry - May 2007

2007-05-31 14:41:29 · 3 answers · asked by Anonymous

NH2Cl, Cl2O, AsH5, AlH3, CCl2F2, O3 explain wether they are polar or non polar. For each polor molecule label the elecronegativity of each atom and show where the partial charges reside. Thanks so much (please no dumb answers).

2007-05-31 14:39:18 · 1 answers · asked by razac24 1

I know my formulas, but this is confusing me

2007-05-31 14:27:42 · 9 answers · asked by Anonymous

2007-05-31 14:16:52 · 1 answers · asked by Nick J 1

Hi Please help!
I have encounter another problem while smelting copper slag. There are alots of air bubble in it, i believe it must due to the smelting temperture or other impurity in it. Do anyone have any idea to remove the air bubbles?

Please Help!!!

2007-05-31 14:01:22 · 1 answers · asked by Anonymous

2007-05-31 14:01:14 · 1 answers · asked by Anonymous

can someone give me the balanced equations.... and i'll do the math...
1. the first step in the industrial manufacture of sulfuric acid is the complete combustion of octasulfur. What mass of octasulfure is erquired to produce 112 L of sulfur dioxide at STP?

2. Coal can undergo an incomplete combustion in the absnece of a plentiful supply of air to produce deadly carbon monixde gas.

3. ammonia reacts with sulfuric acid produces ammonium sulfate

2007-05-31 14:00:38 · 1 answers · asked by no name 1

A gas volume of 100 mL is collected at 40 degrees C and .466 atm of pressure. What will the dry gas occupy at 1.062 atm of pressure?

2007-05-31 13:35:58 · 1 answers · asked by 1234567890 5

What is the solubility (in g salt/100 g of H2O) of the salt?

2007-05-31 13:35:25 · 2 answers · asked by veryberry 3

When I conduct a water quality test on a freshwater stream, what would be the healthy level of Sulfuric acid, and what would it mean, like it has enough acid for fishes to reproduce more, or something like that. I couldn't find any of this off the internet or in any library books. Thanks!!

2007-05-31 13:35:15 · 1 answers · asked by Marcia 1

A one liter flask contains a gas that exherts a pressuree of .470 atm. Another flask contains a gas that has a pressure of .205 atm in a volume of one liter. If both gases are combined into a new flask with a volume of one liter, what is the new pressure?

2007-05-31 13:35:11 · 2 answers · asked by 1234567890 5

A one liter sample of H2 gas exherts a pressure of .533 atm. A sample of oxygen gas is one liter and has a pressure of .750 atm. If both gases are placed into a oneliter container together, what is the new pressure?

2007-05-31 13:32:05 · 2 answers · asked by 1234567890 5

the Ka for hypoclorous acid, HOCl is 2.8 x 10 to the -3 @ 25 degrees celsius. What is the value of pKb?

-Also- how do i write this equation for the ionization of HOCl in H2O.

-What is the OH- concentration of a .05 M aqueous solution of HOCl?

My teacher says if i understand this, then I will be able to do the homework, but, I'm not really getting this. if someone could explain this to me in very simple, step by step type-of terms, that'd be awesome, and good karma will shower you. thanks so much.

2007-05-31 13:32:01 · 1 answers · asked by Anonymous

The chemical that is annually ranked number one in production by weight is:

a. nylon
b. NaClO
c. polyethylene
d. NH3
e. H2SO4

2007-05-31 13:25:18 · 1 answers · asked by nikki 1

by colored flame, i mean a burner flame colored by adding a salt to it.

2007-05-31 13:03:44 · 1 answers · asked by arbanianknight 1

I saw that the food coloring moved and swirled after detergent was put in, but I don't know how this is explained chemically.

2007-05-31 12:55:54 · 1 answers · asked by theimmortal17 1

2007-05-31 12:30:48 · 1 answers · asked by jodia83 1

CdCO3, Ksp = 5.2 10-12......=?

2007-05-31 12:19:37 · 2 answers · asked by Anonymous

why is the potential difference (voltage) produced with identical electrodes ?
how is the fruit clock experiment similar to voltaic cell ?
why would similar electrodes produce voltage ?
why are not voltaic cell practical to use ?
what would voltaic electron (electrodes) used for ?

2007-05-31 12:16:26 · 1 answers · asked by angela 1

how to define what each of the chemicals in the immune system do?or anyone who could tell me if you know?please!im desperate!!

2007-05-31 12:13:16 · 1 answers · asked by jodia83 1

Anyone??...How are ionic and covalent compunds created?????

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

What is the difference between a molecule and a compund???

2007-05-31 12:10:16 · 5 answers · asked by alibee 2

chamber in which oxygen is used at higher-than-normal pressures. How many grams of oxygen are required to fill a 3.00 x 10 to the third liter hyperbaric chamber at a pressure of 250 cm Hg and at 68 degrees F? If the same quantity of oxygen was pumped back into a gas cylinder at a pressure of 200 atm. and at 75K, what would the volume be?

2007-05-31 12:08:08 · 1 answers · asked by Anonymous

2007-05-31 12:03:12 · 2 answers · asked by Anonymous

2007-05-31 11:56:18 · 3 answers · asked by xxx 2

hey people i just wanted to know how did you find this year's chemistry exam, and from what percentage do you expect the A* .

2007-05-31 11:55:02 · 2 answers · asked by MKAA 1

For example, a hardened lump of clay
pleeeeease answer if you know

2007-05-31 11:44:25 · 9 answers · asked by Anonymous

The pH of oranges is 3.54. what is the [H+] concentration?

Which has the higest pH- bananas, w/ a pH of 4.9, or orange juice?

Anyone know hwo to do this? It's a science team excersize and I'm not really a chem guy, more so bio. Thanks

2007-05-31 11:41:35 · 5 answers · asked by Anonymous

2007-05-31 11:39:08 · 7 answers · asked by ♥ 6

Federal regulations set an upper limit of 50 ppm of NH3 in the air in a work environment. Air from a manufacturing operation was drawn through a solution containing 100 mL of .0105 M HCl. The NH3 reacts with HCl:
NH3(aq) + HCl(aq)--> NH4Cl(aq)

After drawing air through the acid solution for 10.0 min. at a rate of 10.0L/min, the acid was titrated. The remaining acid needed 13.1 mL of .0588 M NaOH to reach the equivalence point.
a) How many grams of NH3 were drawn into the acid solution?
b) How many ppm of NH3 were in the air (using air density= 1.2 g/L and an average molar mass of 29.0 g/mol)?

2007-05-31 11:32:32 · 1 answers · asked by Anonymous