Chemistry - March 2007

a) carbon dioxide c) ethyl alcohol
b) water d) oxygen

2007-03-02 13:46:09 · 7 answers · asked by Geaux_time_LsU 1

2007-03-02 13:44:56 · 6 answers · asked by ? 1

2007-03-02 13:42:26 · 1 answers · asked by moonbaby29_us 1

what do i take in high school? what college should i go to? i have mostly a's on my report cards

I would really appreciate any advice that anyone could offer to me; I know I am a little too young but I think it is good to get a head start on things.

2007-03-02 12:35:07 · 5 answers · asked by Booter 3

2007-03-02 12:08:31 · 2 answers · asked by Anonymous

As part of the investigations into the spread of Po-210 following a recent assassination, our lab needs to calibrate the measurements with high levels of this isotope. Where can we get a few megaBequerels?

2007-03-02 11:46:02 · 4 answers · asked by Transuranic 2

Member since: March 02, 2007

Total points: 96 (Level 1)

Points earned this week:
--%Best answer

Calculating enthalpy using thermochemical equations !?
Calculate the enthalpy change of the following reaction between nitrogen gas and oxygen gas, given thermochemical equations 1, 2 ,and 3 .

2N(2) + 5 0(2) ----->2H(2)0(5) AH = ?

1. 2H(2) + 0(2) ------>2H(2)0 AH = -572 kj/mol
2. N(2)0(5) + H(2)0 ---> 2HNO(3) AH = -77 kj/mol
3. 1/2 N(2) + 3/2 0(2) + 1/2 H(2) ---->HNO(3) AH = -174 kj/mol

Additional Details


Thanks for answering , and I follow u up to that point..I know what to do with equations #2 and #3 ... but I'm not sure what to do to equation #1 and why ?? How do i figure that out..I want to multiply it all by 5 , but this doesnt seem right ....help ! thanks

2007-03-02 11:16:46 · 1 answers · asked by Anonymous

Did the cocaine molecule actually retain it's structure and active pharmacology when it was in Coca Cola? Would you expect cocaine to be stable in Coca Cola?

2007-03-02 11:00:38 · 5 answers · asked by Bart Simpson 2

i'm trying to figure out when i use -enoic when naming carboxylic acids.

2007-03-02 10:47:08 · 2 answers · asked by Anonymous

2007-03-02 10:45:52 · 1 answers · asked by Anonymous

Anyone know which chemical in caffeine gives you a so called "buzz"

2007-03-02 10:42:03 · 2 answers · asked by #41 2

2007-03-02 10:37:56 · 2 answers · asked by Baller 2

2007-03-02 10:36:48 · 6 answers · asked by Baller 2

2007-03-02 10:36:00 · 1 answers · asked by aishwarya r 1

2007-03-02 10:35:39 · 2 answers · asked by Baller 2

Please calculate the pH of each of the following aqueous solutions. Report all pH's to two decimal places.
10.0 mL of 0.1 M NaC2H3O2 plus 10.0 mL of 0.1 M NaOH

10.0 mL of 0.1 M NaC2H3O2 plus 15.0 mL of 0.1 M NaOH

2007-03-02 10:27:33 · 1 answers · asked by hotvietboi123 1

Also what are Brown's gas characteristics? Is it true that if I light a match in front of a stream of the Gas I will have a fire torch?

2007-03-02 10:04:07 · 3 answers · asked by Youngboss 3

2007-03-02 09:53:05 · 11 answers · asked by Ejsenstejn 2

How many electrons are in anitbonding orbitals ?

What is the bond order of the ion?

2007-03-02 09:39:22 · 3 answers · asked by dannyg11us 1

Which of the following compounds present exceptions to the octet rule ?



a) NH4+


b) XeF4O


c) XeF6


d) ClO4-


e) NF3


you must enter all true statements alphabetically in one lower case group,
e.g., if a) b) and e) are true you would enter abe


NOTE: condsider formal charges when drawing Lewis structures

2007-03-02 09:35:22 · 3 answers · asked by dannyg11us 1

HCl acidifies [ Zn(NH3)4]2+ and Na2Co3 is added to this. The precipitate is ZnCo3
and....
HNO3 acidifies Pb(OH)2 and Na2CO3 is added to this. This precipitates PbCO3

2007-03-02 09:30:20 · 3 answers · asked by RT 2

How would I separate the gases? Etc. All answers are apreciated

2007-03-02 09:29:22 · 3 answers · asked by Youngboss 3

2007-03-02 09:26:33 · 30 answers · asked by michelle e 1

and what is the name of this machine....it is a machine where you place all these test tubes on it and when u turn it on it begins to spin around .. thus mixxing the material inside the tubes.

2007-03-02 09:18:13 · 8 answers · asked by Kelly P 1

consider 1.00L of a buffer that is 0.200 M HClO and 0.155 NaClO. If 20.0 mmol of sodium hydroxide are added to this buffer (no volume change), the concentrations of HClO and ClO will be?

I hate you chemistry >__>

2007-03-02 09:10:04 · 2 answers · asked by Anonymous

2007-03-02 08:56:03 · 12 answers · asked by Vikki 1

I'm not so sure if I got the right answer. I got 95.3g. But there are various answer like: 70.0g, 59.8g, 95.2g, 125.9g, and 24.3g. So which one is the correct answer.

2007-03-02 08:55:06 · 0 answers · asked by shortydidi03 2

2007-03-02 08:38:47 · 4 answers · asked by Anonymous

2007-03-02 08:38:47 · 4 answers · asked by maddy 1

Aqueous silver nitrate (AgNO3) is added to a solution containing potassium chloride (KCl) and the precipitation of a white solid is called...

2007-03-02 08:17:28 · 3 answers · asked by Jess 2