Chemistry - April 2007

ok, so we have a solution of NaCl, that is 50.grams, and 0.5Liter. what is the volume that we need to make a 1.3L of 0.100 molarity NaCl solution?

plz show the steps

2007-04-05 07:57:49 · 4 answers · asked by Anonymous

2007-04-05 07:54:44 · 1 answers · asked by DCameron G 1

A sample of solid ammonium chloride was placed in an evacuated container and then heated so that it decomposed to ammonia gas and hydrogen chloride gas. After heating, the total pressure in the container was found to be 4.4 atm. Calculate Kp at this temperature for the following decomposition reaction.

NH4Cl(s) <--> NH3(g) + HCl(g)

2007-04-05 07:24:28 · 1 answers · asked by Beri 1

2007-04-05 07:23:57 · 2 answers · asked by LC 3

I cant find info on this[ i went to wikipedia.org but i dont understand it]. I would greatly appreciate if u explain it to me or give me websites.

2007-04-05 07:04:57 · 2 answers · asked by Anonymous

on halogens:

8: The formula of a halogen acid used to etch glass is
a)HCl
b)HF
c)HBr
d)HI

9: The most stable of the following is
a)HF
b)HBr
c)HI
d)HCl

10: Bromine is freed from the bromine compounds in sea water by reaction with
a)chlorine
b)fluorine
c)iodine
d)radon

11: When chlorine water and carbon tetrachloride are mixed with an unkonwn, a violet layer is produced. The unknown is a(n)
a)fluoride
b)chloride
c)bromide
d)iodide

12: The order of activity of the halogens from greatest to least is:
a)F, Cl, I, Br
b)F, Cl, Br, I
c)Cl, F, Br, I
d)Cl, Br, I, F

13: In the laboratory preparation of bromine, manganese dioxide is used as
a)a catalytic agent
b)an inhibiting agent
c)an oxidizing agent
d)a reducing agent

14: A light sensitive substance used in photographic films has the formula
a)AgBr
b)CaF2
c)CuCl
d)MgBr2

and i'll choose a best answer for who answers it first AND has the correct answer.

2007-04-05 07:04:05 · 1 answers · asked by frickenawesomekoreanandyouknowit 2

I'm a little confused about this one...

2007-04-05 06:48:37 · 2 answers · asked by W 1

2007-04-05 05:49:46 · 6 answers · asked by mike 1

2007-04-05 05:21:11 · 3 answers · asked by sjsugiant 2

given the solution:
PbI2--->(reverse reaction)<----Pb^2+(aq)+sI^-(aq)
what is the answer to the above question?
(1)Pb(No3)2
(2) LiNO3
(3) Ca(No3)2
(4)KNO3

2007-04-05 05:10:01 · 2 answers · asked by mike 1

2007-04-05 04:58:40 · 3 answers · asked by getcurious_22 1

PbI2(s)---><----- Pb^2+(aq)+OH^1-(aq)

what is the concentration of I^1- at eqilibrium if the [Pb^2+} is 0.10M?

how do i do a problem like this?

2007-04-05 04:51:34 · 1 answers · asked by mike 1

As a liquid is heated at constant pressure, its temperature increases. This trend continues until the boling point of the liquid is reached. No further rise in temperature of the liquid can be induced by heating.

Please explain.

2007-04-05 04:46:13 · 4 answers · asked by sky_blue 1

1g of unknown acid mix with 120mL water.
then takes 25mL of this mixture and titrate with 0.1M NaOH.

and takes 4.475mL of NaOH to reach end point.

how to find the initial concentration of weak acid?

i only know how to get the moles of NaOH. and from there i'm stucked... so please help..

2007-04-05 04:25:31 · 2 answers · asked by mr.x 1

Hi!
I need to find the pH for a solution with a hydrogen ion concentration of 3.7 x 10 to the -5 M. (the 10 to the -5 part is scientific notation). I also was wondering if anyone knows the ion produced in basic or alkaline solutions? I can't find the answers on wikipedia or any other site...
Thanks in advance,
Jan

2007-04-05 02:52:41 · 5 answers · asked by Jan D 1

BF3 is an electron deficient molecule. B has only 5 electrons. BF3 has a tendency to react with NH3 to form a BF3NH3.

Suggest reason(s) for the reaction and describe the bonding of BF3NH3.

I will be very generous to vote for your answer which is the most elaborated and precise as your best answer.

2007-04-05 02:45:23 · 4 answers · asked by Anonymous

2007-04-05 02:31:17 · 4 answers · asked by whzkid 1

If bonding electrons spend more time near the nucleus of one atom than near the nucleus of the other atom in a covalent bond, what happens?

A. The atoms become ions
B. A dipole is formed.
C. The atoms form a nonpolar bond
D. All of these


Would it also be possible for you to help explain the answer?

2007-04-04 22:50:40 · 6 answers · asked by dex4774 1

1g of unknown acid mix with 120mL water.
then takes 25mL of this mixture and titrate with 0.1M NaOH.

and takes 4.475mL of NaOH to reach end point.

how to find the initial concentration of weak acid?
please help..

2007-04-04 22:18:04 · 1 answers · asked by mr.x 1

2007-04-04 22:16:48 · 6 answers · asked by MARIA M 1

This is a question that I must answer for a prac report in chemistry. I asked this question once before on Yahoo Answers and people said it wasn't true. I don't understand why we'd be asked to specifically answer this question if it wasn't true.

Even if there are some rare cases in which water does not need to be present, why do bicarb soda and citric acid only react with each other in water?

2007-04-04 21:23:12 · 6 answers · asked by Anonymous

Succinic acid and Hexane

Ethanol and Acetanilide

Ibuprofen and Ether

Amphetamine and Water

Thanks in advance people

2007-04-04 20:20:24 · 3 answers · asked by some guy 1

30mL of 0.1M acetic acid with 15mL of 0.1M sodium hydroxide...

1) what's the pH of the buffer solution
2) 5mL of NaOH is added. what's the pH of the new buffer solution..

someone please help me.
thank you..

2007-04-04 20:02:05 · 2 answers · asked by mr.x 1

Neutral Electrolyzed Water (NEW) a product of ECA Technology is not toxic or hazardous and is ecologic friendly. The disinfection results are much better with NEW then Chlorine. Electro chemically activated (ECA) water solutions for use in a multitude of different applications where there is a need for disinfecting, sterilisation, water-purification, cleaning and sanitary-control.

2007-04-04 19:50:41 · 1 answers · asked by kenlipofski 1

Chemistry question. Can Ph=0?
If anyone has any imput or comments I appreciate it!
Please leave any references or websites that could help find the answer, if there is any.

2007-04-04 18:34:38 · 7 answers · asked by A QUESTION 2

Calculate the # of moles of gas at STP in each of the following volumes.

a)168 dm^3
b)3.50 x 10^3 cm^3

2007-04-04 17:04:46 · 4 answers · asked by Anonymous

The total Calories for 2 tablespoons of crunchy peanut butter that contains 6g of carbohydrate, 16g of fat, and 7g of protein.
when i did it i got 214 kcal and its wrong, i dont understand what i did wrong. all i know it as to be in kcal.
this is what i did i timed 6g by 4 kcal and got 24
then 16g by 9 kcal and got 162
then 7g by 4 kcal n got 28 i added them and got 214kcal

2007-04-04 16:58:54 · 3 answers · asked by orange_crush_05 6

What is the formula for finding the volume taken by a given amount of gas at a certain temperature and pressure? I used to do this all the time in high school chemistry, but now that I need it, I dont' know it! Stay in school!

2007-04-04 16:50:04 · 3 answers · asked by Commadore Tommy Gun 3

I need to figure out the mass of the final product, H3PO4.
They give me the starting amounts and each balanced equation:
20.0g P
30.0g O2
15.0g H2O

4P + 5O2 ->P4H10

P4O10 + 6H20 -> 4H3PO4

2007-04-04 16:39:10 · 1 answers · asked by alley 2

i want to make some smoke bombs and it says to use potassium nitrate, also known as saltpeter. is salt peter easy to make at home or does it have to be bought? if it can be made at home, then how?

2007-04-04 16:14:57 · 3 answers · asked by beaubaysinger 1