Chemistry - March 2007

A) as electrons jump from lower energy levels to higher levels.
B) as the atoms condense from a gas to a liquid.
C) as electrons jump from higher energy levels to lower levels.
D) as they are heated and the solid melts to form a liquid.

2007-03-28 15:56:13 · 2 answers · asked by emilyanngarza24 1

CH3CH2Br + OH- → CH3CH2OH + Br-

1) This is an example of a elimination reaction



2) Only single bonds are formed in the product

Pb2+(aq) + 2I−(aq) → PbI2(s)


3) This is an example of a neutralization reaction



4) The product is an ionic compound

2007-03-28 15:55:57 · 1 answers · asked by Anonymous

1) milk
2) gasoline
3) muddy water
4) steel
5) coffee
6) ink
7) crude oil
8) bronze
9) brass
10) sea water

2007-03-28 15:54:56 · 2 answers · asked by mz. * 1

Calculate the concentrations of the constituent ions of .0112M CaCl2.

The answers are supposed to be [Ca+2]=.0155M [Cl-]=.310M, but I keep getting [Ca+2]=.0112M and [Cl-]=.0224M.

How should I do this problem?

Thank you! ^-^

2007-03-28 15:49:54 · 3 answers · asked by Anonymous

different sites say different things! I am so confused! Please help! Thank you very much!

2007-03-28 15:36:43 · 6 answers · asked by killiana 2

A) [Ne]3s2.
B) [Ne]3s23p6.
C) [Ar]4s13d1.
D) [Ar]4s2.

2007-03-28 15:33:16 · 1 answers · asked by Super24 1

A) 0
B) 1
C) 2
D) 3

2007-03-28 15:32:23 · 3 answers · asked by Super24 1

How did the solubility of the NH4Cl vary with temperature? and Why does this variation occur?

2007-03-28 15:28:03 · 3 answers · asked by . 1

"What atomic or hybrid orbitals make up the sigma bond between As and F in hexafluoroarsenate ion, AsF6- ?


sp3d2 orbital on As + 2p orbital on F



What are the approximate F-As-F bond angles ? (list all possible) ... 90 1800

Feedback:

The Lewis structure for AsF6- is: ... There are 6 σ bonds and 0 lone pairs around As giving rise to sp3d2 hybridization on As.

The As-F σ bond is therefore made up of one sp3d2 orbital on As and one 2p orbital on F.

The sp3d2 hybridization on As results in approximate F-As-F bond angles of 90 1800. "

I understand the sp3d2 on As. Why is it 2p on F? How are you supposed to know what it's supposed to be on F? The stupid feedback section didn't even give an explanation, it explained the sp3d2 and gave nothing to explain why it's 2p for F.

2007-03-28 15:23:46 · 1 answers · asked by Anonymous

2007-03-28 15:22:21 · 3 answers · asked by SydneyLove 1

please help me i am struggling! Thanks

2007-03-28 15:11:44 · 6 answers · asked by killiana 2

Why earthworms are added to soil with EDTA?

2007-03-28 15:07:19 · 1 answers · asked by ca 2

any interesting slogan? You dont have to make it up..if you find a clever slogan on the internet!

2007-03-28 15:04:09 · 4 answers · asked by killiana 2

2007-03-28 15:00:42 · 2 answers · asked by asha e 1

Could you tell me how to do this Chemistry problem? Total/Partial Pressures?



In a gas mixture, the partial pressures are argon 415 mm Hg, neon 75 mm Hg, and nitrogen 125 mm Hg. What is the total pressure (atm) exerted by the gas mixture?

2007-03-28 14:50:15 · 2 answers · asked by ScarlettMaria 1

immediate response is preferred
please if you could add the reactants and products with balances

2007-03-28 14:41:17 · 1 answers · asked by ♥ 3

Benzene reacts w/ bromine to produce bromobenzene according to the following equation:
C6H6(l) + Br2(l) -----> C6H5Br(l) + HBr(g)
or
Benzene + Bromine -----> Bromobenzene + Hydrogen bromide

A) which is the limiting reagent?

B) How many grams of bromobenzene are formed in the reaction?

I need to know the answer and also how to get it, because i have a few more questions exactly like it.

2007-03-28 14:40:36 · 2 answers · asked by Anonymous

2007-03-28 14:39:49 · 15 answers · asked by Anonymous

2007-03-28 14:33:48 · 1 answers · asked by Anonymous

2007-03-28 14:33:20 · 2 answers · asked by eaw_mkj 2

Would someone please explain this Chem prob.?
What is the new temp. in degrees C?
Solve for the new temperature in degrees C when the following pressure changes occur, with constant n and V:

a) A 10.0-L container of helium gas with a pressure of 250 torr at 0 degrees C is heated to give a pressure of 1500 torr.

b) A sample of air at 40 degrees C and 740 mm Hg is cooled to give a pressure of 680 mm Hg.



Please explain the work, Thanks!

2007-03-28 14:30:51 · 2 answers · asked by SunshineGal 1

a) suggest a readily available compound that could be used to remove the acid
b) write an equation for this reaction and say what type of reaction this is
anyone?

2007-03-28 14:23:33 · 3 answers · asked by KN 1

Ok. I am planning to do explode something in my cafeteria that will get a big attention of the whole lunch room but all I can think of is a belt of firecrackers which i think it is a bit far which will get me arrested because I live in Illinois. Explode a bottle is good enough but I don't know how.

2007-03-28 14:08:08 · 4 answers · asked by zumitigger1 1

I'm in this academic Chemistry class and it's way over my head. I have a test soon and i don't understand what we are doing in class at ALL!! The sad part is i don't even know what it's called that we are doing. I just stare at the problems he works out on the board and it just doesn't make sense to me. Its not like i don't try it's just so hard. Please either help me, or tell me a good website that could teach me. Here's an example of what we do in class:

Write the balanced formula, complete ionic, and net ionic equations for the reactions that occur when the following are mixed.
1. Solid silver hydroxide and hydrobromic acid
2. aqueous strontium hydroxide and hydroiodic acid

Another question i have is how do u tell if it is aqueous, solid or liquid? Please help me any help at all is appreciated Thanks

2007-03-28 14:01:19 · 5 answers · asked by *lil' leasha lu* 2

2007-03-28 13:59:01 · 2 answers · asked by Johnathan H 1

2007-03-28 13:47:25 · 1 answers · asked by christine2550@sbcglobal.net 2

How do you do problems with gases in reactions at STP?
Use molar volume to solve the following problems at STP:
a) the volume L occupied by 2.5 moles N2
b) the volume ml occupied by 0.420 mole He
c) the number of grams of neon contained in 11.2 L Neon gas
d) the number of moles of H2 in 1620 ml H2 gas

Note: 1 mole gas stp = 22.4 L
V1/n1=V2/n2

2007-03-28 13:34:45 · 2 answers · asked by Kitten 1

2007-03-28 13:26:06 · 6 answers · asked by Mindy D 2

2007-03-28 13:24:52 · 4 answers · asked by Mindy D 2

1. A --> B Delta H = +30 kJ
B --> C Delta H = +60 kJ

Use Hess's Law to calculate the enthaply change for reaction A --> C



2. 2H2 (g) + O2 (g) ---> 2H2O (g) Delta H = -483.6 kJ
3O2 (g) ---> 2O3 Delta H = +284.6 kJ

calculate the heat of the reaction 3H2 (g) + O3 (g) --> 3H2O (g)

2007-03-28 13:23:05 · 1 answers · asked by Anonymous