Chemistry - December 2007

2007-12-19 14:29:59 · 5 answers · asked by jeremy 2

2007-12-19 14:29:24 · 2 answers · asked by Madman08 1

potassium is stored under oil. why??

2007-12-19 14:19:40 · 3 answers · asked by Anonymous

One container with a volume of 1 L contains argon at a pressure of 1.77 atm, and a second container of 1.50 L volume contains argon at a pressure of 0.487 atm. they are then connected to each other so that the pressure can become equal in both containers. what is the equalized pressure? i guess we have to use dalton's law. but i dunno

2007-12-19 13:13:40 · 1 answers · asked by Anonymous

if you take a 1 liter samle of air from Pike's Peak (4270m above sea level) to death valley (85m below sea level) in a flexible container, how would the following change:

A) mass of the air sample?

B) molecules in the air sample?

C)volume of the air sample?

2007-12-19 13:00:33 · 4 answers · asked by Anonymous

this will gain me 20 points on my upcoming midterm! please please please do help me. i don't quite understand this so can you please explain me how this works: origanlly "tamarino"(the food) is sour but when you mix it with ashes it becomes sweet:
heres the equation:
tamarino+ashes-> sweet tamarino

please if u know anything about this please help me! thanks so much! love you all =)

2007-12-19 12:46:53 · 3 answers · asked by Erica N 1

I need a wee bit of help s'il vous plait!! Lol
This is just a little bit of my home work that I am having trouble
with & if someone can explain this much to me I think I can
figure out the rest of my worksheet like this!
Please & Thank You!!


1)What products would CaCl2 + NaC18H33O2 form?

2)What ratio of drops of equal molarity would give you the largest volume of precipitate?(goes with problem #1)(please explain this!!)

3)Which of the following mixtures will make the largest amount of precipitate? Explain your reasoning.

(A) 100 mL 1.0 M AgNO3 +200 mL 1.0 M CaCl2
(B) 200 mL1.0M AgNO3 + 100 mL 1.0 M CaCl2
(C) 150 mL 1.0M AgNO3 + 50 mL 1.0 M CaCl2
(D) 50 mL 1.0 M AgNO3 + 150 mL 1.0 M CaCl2

2007-12-19 12:39:20 · 2 answers · asked by Anonymous

I called a farm implement store and they had no idea.
I could use a few suggestions

2007-12-19 12:22:13 · 3 answers · asked by walt554 5

Ive read, and been told that some alloys are formed simply by melting the two metals and then mixing them together.

But alloys are homogenous (uniform) mixtures

If this really works, how come the metals mix evenly ? why dont they mix randomly so that the alloy is not uniform?

If this doesnt work, how are alloys formed? or are there any other ways to form alloys ?

2007-12-19 12:15:12 · 1 answers · asked by Anonymous

What effect does temperature have on vapor pressure

2007-12-19 12:06:27 · 1 answers · asked by aaadaj 1

2007-12-19 11:04:15 · 4 answers · asked by Vicky 1

In chemistry, we are give a word equation (for example, lead(ii)oxide + water), and we then have to complete it and balance it in a chemical equation. How do I complete it? We also have to indicate the state of each reactant and product, which I can do. Here are some of the problems (but I really just want to know how to do it):

Aluminum + ferric chloride solution
Sodium sulfide solution + barium chloride solution
Carbon dioxide gas + sodium hydroxide solution
Magnesium nitric acid

I think I know how to start it (for example, with lead (ii)oxide + water, it becomes PbO+H2O-> XXX (I don't know what the XXX would be)), but I cannot find what type of reaction occures, and what the final product is.

2007-12-19 10:36:19 · 1 answers · asked by Alex K 2

55. Propane (C3H8) is a gas used for cooking and heating. How many molecules are in 6.12 moles of propane?

How do you do this?

thanks

2007-12-19 10:34:49 · 2 answers · asked by sheparddancr1217 2

How do you do this...

53.) Calculate the average atomic weight for magnesium.

**Then they gave me a table/chart** it says:

mass # exact weight % abundance
24 23.985042 78.99%
25 24.985837 10.00%
26 25.982593 11.01%

2007-12-19 10:33:15 · 1 answers · asked by sheparddancr1217 2

A neutral atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons and electrons.

2007-12-19 10:26:08 · 7 answers · asked by Testhaha 1

is it just pv=nrt

2007-12-19 10:26:02 · 3 answers · asked by king of soccer 1

The Reaction is as follows:

CaI2(aq)+ K2C2O4(aq) --> CaC2O4(s) + 2KI(aq)

a.) If you had .05 moles of each reactant, how many moles of each product could you make?

b.) If you had 10.0 grams of calcium iodide, how many grams of calcium oxalate could you potentiallly make?

c.) How many grams of potassium iodide could you make with 10.0 grams of calcium iodide?

2007-12-19 10:24:58 · 3 answers · asked by Anonymous

2007-12-19 10:23:49 · 2 answers · asked by danasha 1

2007-12-19 10:20:49 · 1 answers · asked by danasha 1

H2 gas is produced from the single displacement reaction of magnesium with 6M HCl, with the HCl in excess. If we with to produce 42 ml of H2, how much magnesium is needed?

2007-12-19 10:17:42 · 1 answers · asked by kim 1

I have a 50 gal reef tank whose pH is too low, about 8.0, I want the pH to go up to 8.3 - 8.4, and I have a safe additive to do that, but what is the equation to determine, based on the pH of the input solution, how much I would need, or what concentration of X volume of additive I'd need to raise the 55 + X gallons to 8.3 pH ? FYI I'm actually using this, I"m not a college flake trying to get someone else to do my homework for me :D

2007-12-19 10:13:11 · 1 answers · asked by Anonymous

2007-12-19 09:51:04 · 2 answers · asked by African Princess 2

We did a lab about the enthalpy of the fusion of ice in chem 2 class where you add ice to water and watch the temperature change. data:
cup before 4.7 g, cup 1/3 full of water 180.5 g
the temperature started at 18 C and the final temp was 2 C

we need to calculate the heat lost, heat gained, heat of fusion, and the change in Hfus in kj/mol

would someone please help me figure out how to determine this assignment? thank you so much

2007-12-19 09:48:49 · 1 answers · asked by Anonymous

2007-12-19 09:48:36 · 1 answers · asked by African Princess 2

I have an IPC (Integrated Physics and Chemistry) paper about rate of reaction between ascetic acid and calcium carbonate. I need a relevant but clever title. Basically it has to do with the reaction time between acid and different sizes of chalk dust. If you have an idea at all, please answer! Thanks ahead of time!

2007-12-19 09:43:34 · 7 answers · asked by ehsknights_cheer 3

zinc that must react w/ an excess of nitric acid to form 87.3 g of ammonium nitrate.

2007-12-19 09:34:02 · 2 answers · asked by Anonymous

how might they do this

need helpp!!!!!!!!!!!! bad

2007-12-19 09:32:21 · 4 answers · asked by Anonymous

need help with labs

2007-12-19 09:30:44 · 2 answers · asked by Anonymous

transport the isotope and still have enough

2007-12-19 09:24:50 · 2 answers · asked by Anonymous

Hey! How do these elements enter our bodies?
carbon
hydrogen
nitrogen
calcium
thanks!

2007-12-19 09:22:54 · 3 answers · asked by Anonymous