Chemistry - November 2006

I can't bare being in class anymore! I feel like just uuuuuuuughhhhh! Its frustrating and I really don't know what to do anymore!

2006-11-05 16:54:17 · 8 answers · asked by geniusflightnurse 4

2006-11-05 16:13:11 · 4 answers · asked by Anonymous

2006-11-05 16:01:16 · 4 answers · asked by Anonymous

Explain why if you can!

2006-11-05 15:54:15 · 11 answers · asked by mattmonochrome 2

A 1.397 g sample of Thymol, C10H14O is burned in a bomb calorimeter assembly. The temp. increase is 11.23C, and the heat capacity of the bomb calorimeter is 4.68 kJ/C. What is the heat of combustion of thymol, expressed in kJ/mol of thymol?

2006-11-05 15:45:51 · 1 answers · asked by megan6288 1

If I have a 8.345x10-3 moles in .05L of solution, I have .1669M right? Now, if the pH is 4, then is the formula for Ka is:
(10x-4)(10x-4)/.1668?

Then how do I calculate the Ka after I've added, say, .005L of a base of .4M?

2006-11-05 15:30:40 · 1 answers · asked by Anonymous

2006-11-05 15:19:15 · 3 answers · asked by sd_minu2004 1

2006-11-05 15:15:12 · 1 answers · asked by Nick 2

~suppose you used the correct amount of sodium bicarbonate but an excess of vinegar. what effect would this have on the volume of carbon dioxide produced?

~suppose you used the correct amount of vinegar but less sodium bicarbonate than you needed. what effect would this have on the volume of carbon dioxide produced?

2006-11-05 15:04:38 · 4 answers · asked by Anonymous

How many bonds can a carbon, hydrogen, and oxygen atom make individually?

2006-11-05 14:27:16 · 3 answers · asked by Anonymous

When it's weighed on a balance, is the mass of the dish bigger or smaller than it's suppose to be?

2006-11-05 13:57:43 · 8 answers · asked by aSnxbByx113 2

This is for the "source of error" part of a lab report. THankyou very very much!

2006-11-05 13:52:35 · 4 answers · asked by ChaChaChingThing 2

Some boiling points for hydrogen compounds of Group 15, 16 and 17 elements in degrees celsius:

Group 15
PH3 (g)-87
AsH3 (g)-55
SbH3 (g)-17

Group 16
H2S (g)-61
H2Se (g)-42
H2Te (g)-2

Group 17
HCl (g)-85
HBr (g)-67
HI (g)-36

I don't understand the trend between groups... Group 16 is highest, then Group 15, and Group 17 is the lowest? That does not fit into any pattern, whether I think of polarity, molecular size etc.? Can someone explain why this is so?

2006-11-05 13:09:54 · 2 answers · asked by cmdr2006 2

H3PO4 + Sr(OH)2 -->

a) no reaction
b) SrH3PO5
c) SrH5PO6
d) Sr3(PO4)2

Please explain how you get it also. I don't understand this one. Thanks!!

2006-11-05 13:03:52 · 3 answers · asked by Anonymous

how would u seperate these mixture and solutons?

sand and water:

salt and water:

sawdust and iron filings:

2006-11-05 12:58:36 · 2 answers · asked by Anonymous

can u give me the exact answer to this question please? How many atoms are in 2 moles of aluminum?

2006-11-05 12:45:13 · 1 answers · asked by Anonymous

Please help me figure out if these reactions will occur!

Note: This is not my homework..but it is examples as to how to see how to do my homework.

Mg(s)+CuCl2(aq)-->
Pb(NO3)2(aq)+Zn(s)-->
KI(aq)+Cl2(g)-->
Cu(s)+FeSo4(aq)-->

Please help me understand how a reaction will occur.

Thanks so much!

2006-11-05 12:31:34 · 4 answers · asked by Rebecca 3

2006-11-05 12:20:46 · 3 answers · asked by kimmie082krunk 1

2006-11-05 12:20:44 · 1 answers · asked by J.K J 2

Look at this video..

http://video.google.com/videoplay?docid=-664568460739826575&q=chlorine

weird yea??

-thanks for your answers-

2006-11-05 12:20:37 · 2 answers · asked by RedHead 3

2006-11-05 12:18:11 · 5 answers · asked by kimmie082krunk 1

2006-11-05 12:12:50 · 3 answers · asked by Anonymous

Consider the reactants in the partial equation given. Which choice is a product?

H3PO4 + Sr(OH)2 -->

a) no reaction
b) SrH3PO5
c) SrH5PO6
d)Sr2(PO4)2

Please explain how you get it also. I don't understand this one. Thanks!!

2006-11-05 12:10:02 · 4 answers · asked by Anonymous

2006-11-05 11:44:57 · 3 answers · asked by jesus26056 M 1

2006-11-05 11:30:14 · 1 answers · asked by Anonymous

0.1M NaCl
0.2M NaCl
0.3MCh3COOH
0.4M CH3COOH

2006-11-05 11:26:09 · 1 answers · asked by annie 3

What is the concentration of HCl after 10.00 mL of 1.00 M HCl is mixed with 10.00 mL of .500 M NaOH?

I think I need to find the limiting reactant...

.01 L x (1.00 mol HCl/ L) x (1 mol H2O/ 1mol HCL) = .0100 mol H20

.01 L x (0.500 mol NaOH/ L) x (1mol H2O/ 1mol NaOH) =
.005 mole H2O.

So, the LR is NaOH.

What is left over is HCl, but I dont what to do next, or if I am doing right at all.

Thanks for your help.

2006-11-05 11:16:28 · 3 answers · asked by Anonymous

before it kills someone? How long before it dissipates from the house? If animals were say in another room or other part of the house would they be safe? I'm asking because my brother-in-law did this the other day by accident, he said he felt the effects before he even raised up from where he poured the mixture, they shut the door to the room and turned on the fan, but we were worried if it had been left un-attended would it have harmed the animals in the house. About a 1200 sq. ft, open area with a full basement, where the cats probably would've hid. So does anyone know? I'd appreciate the info. Thanks.

2006-11-05 11:13:52 · 4 answers · asked by -Tequila17 6

with 0.15 M NaCl solution? 0.05M,0.10M, or 0.15M,,or none of them

2006-11-05 11:09:36 · 1 answers · asked by annie 3

1. it dissolves into ions
2. it forms covalent bonds with water
3. it forms hydrogen bonds with water

2006-11-05 11:07:02 · 1 answers · asked by annie 3