Chemistry - February 2007

on which side should the energy term be written in an equation representing an endothermic reaction? In an equation representing an exothermic reaction?

* This is indeed a homework question, i've looked through and through my chemistry book and cannot find this answer anywhere! I even tried google and yahoo still couldnt find an answer please help me*

2007-02-26 11:36:22 · 5 answers · asked by !¿question!? 2

where can I find online a dot diagramn of ionic bonds?

2007-02-26 11:35:19 · 3 answers · asked by megmotox 3

Will the liquid propane in my gas grill tank freeze if left out in the elements.

2007-02-26 11:33:37 · 1 answers · asked by Anonymous

when the
mass is 75g
c=4.184
temp change was from 25.0 to 27.2˚C

what is the specific heat in J/g˚C

2007-02-26 11:23:20 · 2 answers · asked by THE ICE AGE 2

2007-02-26 11:17:57 · 14 answers · asked by kitty 1

2LiOH + CO2 --> Li2CO3 +H2O. Determine the mass of carbon dioxide removed if the space vehicle carries 42.0 mol LiOH.

2007-02-26 11:17:25 · 1 answers · asked by boredandhungry 1

Here is the formula I got (there * next to the numbers means there subscripts):

Al*2 (CO*3)*3 + HCl ---> AlCl*3 + H*2O + CO*2

How can I balence that? I tried but the teacher said it wasn't right. The charge of Aluminuim [Al] is +3 and the charge of Chlorine [Cl] is -2. HELP!!!?

2007-02-26 11:12:30 · 1 answers · asked by Shorty 4

Which of the following bonds would you expect to be covalent

1) N--O
2) Cs--O
3) Na--Cl
4) Ca--O
5) S--H

2007-02-26 11:12:07 · 2 answers · asked by jeniferrrr 1

Which of the following compounds would you expect to exhibit hydrogen bonding:
PH3, CH4, H2O, HBr, HF, NaOH

2007-02-26 11:09:37 · 5 answers · asked by untilyoucamealong04 3

Which of the following compounds can exist as (cis) and (trans isomers)?

a) Cl2CH2


b) CHCl=CCl-CH3


c) HClCFCl


d) CBrH=CH-CH2Cl


e) 1,1-dichloroethene

2007-02-26 11:09:23 · 1 answers · asked by jeniferrrr 1

atomic mass of water: 18.01528
A student purchases 500.0 grams of drinking water?

2007-02-26 11:07:25 · 3 answers · asked by Anonymous

In a lab additional questions it asks,
Describe how to prepare 250.0 ml of 0.1000 M AgNO3 from pure solid silver nitrate.

I don't understand how to solve it. Someone please explain.

2007-02-26 11:06:25 · 1 answers · asked by cooterpie02 2

What is the equilibrium constant for the following reaction?
NiCO3(s) + 6NH3(aq) Ni(NH3)62+(aq) + CO32-(aq)
Ksp for NiCO3 = 1.3 x 10-7 and Kf for Ni(NH3)62+(aq) = 1.2 x 10 9
1.2 x 109
1.56 x 102
9.23 x 1015
1.08 x 10-16
6.41 x 10-3
8.33 x 10-10

2007-02-26 11:04:14 · 1 answers · asked by Anonymous

The solubility of which one of the following compounds will increase if the pH of a saturated solution of the compound is lowered?
AgF
AgCl
AgBr
AgI
Ag2SO4

2007-02-26 11:01:52 · 1 answers · asked by Anonymous

A) Hydrocarbons dont burn
B) C3H8O2
C) H2O and CO2

2007-02-26 11:01:37 · 1 answers · asked by lauren H 1

2007-02-26 10:58:10 · 6 answers · asked by Theo Z 2

PLEASE HELP!

2007-02-26 10:57:38 · 5 answers · asked by iqbalkhanayesha 2

I have a few stoichiometry problems that I need help with. If you could show your work, then that'd be really, really good! Please put the number of the one you solved next to it. Thanks for anyone who can help me!!

1) N2 + 3H2 ---> 2NH3 What volume of hydrogen is necessary to react with 5 liters of nitrogen to produce ammonia?
2) what volume of ammonia is produced in the reaction in problem one?
3) C3H8 + 5O2 ---> 3CO2 + 4H2O If 20 liters of oxygen are consumed in the above reaction, how many liters of carbon dioxide are produced?
4) 2H2O ---> 2H2 + O2 If 30 mL of hydrogen are produced in the above reaction, how many milliliters of oxygen are produced?
5) 2CO + O2 ---> 2CO2 How many liters of carbon dioxide are produced if 75 liters of carbon monoxide are burned in oxygen? How many liters of oxygen are necessary?

**All these formulas are already balanced. There are more problems below!!

2007-02-26 10:39:05 · 2 answers · asked by Dana Mulder 4

In Chemistry today we did a lab on Combustion. We told some alcohol and bored it into a pop bottle. we then shook the alcohol around until the inside of the bottle had alcohol all inside it. THen we poured to extra alcohol out of the bottle.
After that we lit a place and placed it inside the bottle. the fire immediatley caught the alcohol and and a fire shot up form the bottle and lasted about 2 seconds. Then we had to pour the remaining alcohol onto the lab table. THen we were told to let the alchol on the lab table on fire and it worked. The fire kept burning untill all the alcohol was gone!

my question is: why was the left over alcohol sill flamable on the table??

I tihnk it has somehting to do with oxygen but i am not sure!!

thanks

2007-02-26 10:35:54 · 6 answers · asked by allyy 2

will a double replacement reaction occur if KOH is mixed with Pb(NO3)2 ? I am thinking that is does but i wanted to know the ways you can tell?

2007-02-26 10:21:24 · 3 answers · asked by jenleebrandt 2

i cant balnce the cubustion formula of:

C2 H5 O8
**its all one equation and the numbers are supposed ot be small....

2007-02-26 10:01:11 · 4 answers · asked by allyy 2

Well I think thats what its asking...Ok heres the 1st part of it:

I have the temp of bath water in Celcius: 1.1
and the Height of Air Column (relative vol.) (cm): 4.8

and I need to find the Temp(K)
& V/T (cm/K)

now how do I find them? Please explain! I have a test coming up and this might be on it!
AND I ALWAYS CHECK A BEST ANSWER..so someone will get 10 points! :)

2007-02-26 10:00:14 · 3 answers · asked by Tracey Lee ♥ 2

more than one answer
Which of the following bonds would you expect to be covalent ?
a) Na--F

b) O--Cl

c) C--F

d) Ca--O

e) S--H

Which of the following compounds can exist as cis and trans isomers ?



a) Cl2CH2


b) CHCl=CCl-CH3


c) ClBrCHCl


d) CBrH=CH-CH2Cl


e) 1,2-dichloropropene

2007-02-26 09:56:19 · 2 answers · asked by Anonymous

2007-02-26 09:54:14 · 2 answers · asked by allyy 2

2007-02-26 09:45:55 · 2 answers · asked by linifer74 1

2007-02-26 09:41:57 · 4 answers · asked by Tracey Lee ♥ 2

When you mix aqueous solutions of HNO3 and H2SO4, what are the products? Hydrogen, nitrogen dioxide and...what? The nitric acid is 16 molar and the sulfuric is 18M.

2007-02-26 09:35:41 · 1 answers · asked by emsviper 2

which dissolves faster, a cube of sugar or granulated sugar and why? what does this have to do with surface area?

2007-02-26 09:30:00 · 4 answers · asked by i ♥ EStEBAN 2

silver nitrate (aq)?

2007-02-26 09:24:19 · 1 answers · asked by jgirly25 1

2007-02-26 09:13:35 · 1 answers · asked by jgirly25 1