Chemistry - September 2007

chemistry homework. answers greatly appreciated.

2007-09-08 09:59:04 · 4 answers · asked by Anonymous

2007-09-08 09:54:48 · 2 answers · asked by cutiee pie 1

2007-09-08 09:52:09 · 2 answers · asked by cutiee pie 1

im having trouble with this question:

what is the hybridization of the carbon in acetonitrile?
how do i go about finding this?

H-C= N

there are 3 bonds between C & N.


THANKs

2007-09-08 09:37:05 · 1 answers · asked by Velvet - joux 3

My grade 10 science teacher assigned us to do all of the elements from hydrogen-argon... ex: hydrogen would be 1S1, and helium would be 1S2, and lithium is 1s2 2s1. (those are the ones that she gave the answers to)

I understand that the first number is the number of energy levels, the letter is for the orbital shape and the second number is the number of electrons.... but i have no idea how i am supposed to know what orbital shape is what element?

2007-09-08 09:30:15 · 3 answers · asked by Carly R 1

2007-09-08 09:19:55 · 4 answers · asked by sdt3 1

im terrible in chemistry.also; atoma are made of mostly what? what would be the charge of the nucleus? what 2 devices are used to see atoms? and what is the gold-foil experiment rutheford performed? i know thats a lot sorry but i need help

2007-09-08 09:14:43 · 3 answers · asked by Anonymous

when calculating the enthalpy value (using Hess's law) to find the change in enthalpy of one reaction by combining 3 others, is it ok not to use one of the below reactions? Can using 2 of the 3 reactions be ok if it still makes the target or main reaction?

2007-09-08 09:02:12 · 1 answers · asked by Wanda McAlias 2

2007-09-08 08:58:09 · 3 answers · asked by Xiang Yu 1

Gently heating ammonium nitrate, NH4NO3, in a test tube produces a mixture of two gases A and B. No residue remains in the tube.
The mass spectrum of gas A contains peaks at m/e (mass number) values of 16, 17 and 18, whereas that of gas B has peaks at m/e values of 14, 16, 28, 30 and 44.

Identify the peaks in the mass spectra, and suggest the molecular formulae of gases A and B.

2007-09-08 08:54:08 · 3 answers · asked by Anonymous

i need tp produce 11.3 kg of sodium sulfide frem sodium metal and dihydrogen sulfide. how many grams of starting material do I need if I know this reaction proceeds in 65% yield?

2007-09-08 08:49:20 · 1 answers · asked by Anonymous

when I react 12.7 grams of Mg with excess HCl gas I expect my proceed with 50% yield. How many grams of MgCl2 should I obtain?

2007-09-08 08:39:54 · 2 answers · asked by Anonymous

Also, is a covalent compound only between two non-metals? Thanks!

2007-09-08 08:26:11 · 2 answers · asked by microfine19 2

Hi... im doing a science report. i can use the internet to find my answers, so im gonna use this while search for other answers to other questions. so yeah, can anyone tell me what the difference is between an atom and an element?

2007-09-08 08:25:14 · 10 answers · asked by echotongue 1

2007-09-08 07:54:27 · 7 answers · asked by andrue anderson 1

The net ionic equation of the reaction between Ksubscript2Crsubscript2Osubscript7 and FeSOsubscript4 in an acidic medium is given below:

Crsubscript2Osubscript7superscript2- + 6Fesuperscript2+ + 14H ---> 2Crsuperscript3+ 6Fesuperscript3+ +7H2O

a)how many moles of Ksubscript2Crsubscript2Osubscript7 can be reduced by 0.0865 mol of FeSOsubscript4?
b) how many moles of Crsuperscript3+ would be produced?

2007-09-08 07:34:36 · 2 answers · asked by Anonymous

A purple solution is 16.05 mg/L in sodium salicylate, 0.15 M in HCL and 0.065 M in iron(III) ions. What are the concentrations of these three once you diluted the 10.00 ml to a final volume of 50.00 ml in volumetric flask?

This has me really confused, any help would be appreciated

2007-09-08 07:31:11 · 1 answers · asked by Bob Sanders 2

2007-09-08 07:02:09 · 6 answers · asked by SHF 1

Chemistry question: what does relative abundance tell you?

2007-09-08 06:55:26 · 1 answers · asked by bubblepup13 3

umm
so where can i get one, and how much does it cost?
please and thank yers!!

2007-09-08 05:24:19 · 7 answers · asked by judy 1

Nitrogen gas (N2) can be prepared by passing gaseous ammonia (NH3) over solid copper (ll) oxide (CuO) at high temperatures. The other products of the reaction are solid copper (Cu) and water vapor (H2O)
a. If 18.1 g of NH3 is reacted with 90.4 g of CuO, which is the limiting reactant?
b. How many grams of N2 will be formed?
plz help me !!!!!

2007-09-08 04:44:25 · 2 answers · asked by shima 1

Aluminum reacts with oxygen to produce aluminum oxide. If you want to produce 5.00 moles of aluminum oxide, how many moles of aluminum and how many moles of oxygen will be required?

2007-09-08 04:37:52 · 2 answers · asked by Jack L 1

Can anyone tell me a mole equation for solids ??????

2007-09-08 04:29:20 · 6 answers · asked by Anonymous

All living organisms on Earth contain carbon. If Carbon-12 amu mass = 12, makes up 98.89%, and Carbon-13, amu mass = 13, makes up the other 1.11%, what is the average atomic mass of carbon?

I'm a little confused how to go about this question. What does the information show me and how do I use it to get the answer.

2007-09-08 03:58:44 · 2 answers · asked by Average Joes 4

A gas jar at room temperature contains a mixture of equal volumes of hydrogen, H2 and Helium, He.
(a)which gas is moving faster?
give a reason for your answer.
(b) If the gas jar is warmed to 50 degrees celsius, state what would happen to the speeds of the gases.

2007-09-07 23:40:59 · 5 answers · asked by Anonymous

2007-09-07 23:29:10 · 3 answers · asked by Anonymous

2007-09-07 23:04:08 · 10 answers · asked by Ahmed 2

One town/city/village i britain is partly named after an element can you answer me?

2007-09-07 22:40:34 · 3 answers · asked by Luke T 1

2007-09-07 20:39:38 · 3 answers · asked by Anonymous

2007-09-07 19:56:07 · 3 answers · asked by Anonymous