Chemistry - November 2007

2007-11-06 13:26:23 · 1 answers · asked by Anonymous

What element(s) is/are reduced in the following redox reaction? Show your reasoning.

Cu(s) + H2SO4 (aq) → CuSO4 (aq) + H2(g)




Thanks so much for the help!!!

2007-11-06 13:21:59 · 3 answers · asked by CrimsonRider 1

C5H12(l) + 8 O2(g) --> 5CO2 (g) +6 H2O (g)

calculate delta Hrxn for this reaction using standard enthalpies of formatio (The standard enthalpy of formation of liquid pentane is -143.8kJ/mol)

2007-11-06 12:56:14 · 1 answers · asked by Anonymous

2007-11-06 12:53:51 · 2 answers · asked by Jorge E 2

the combustion of CACO3 gives CaO + CO2
how many grams of CO2 are produced in the decompotition of 1 gram of CACO3?

2007-11-06 12:46:12 · 3 answers · asked by espiral 2

I will give best answer whoever can balance this equation first

Cu + HNO3 ---> Cu(NO3)2 + NO + H20

P.S. everything is the way its suppose to be

2007-11-06 12:33:14 · 4 answers · asked by Anonymous

Determine the oxidation numbers for each of the indicated elements in the following molecular species.

(a) N in NO2-

(b) Cl in ClO4-

(c) P in P2O5

(d) O in H2O2

(e) Fe in Fe(CN)6 ^3-





Thanks for the Help!!!

2007-11-06 12:32:02 · 1 answers · asked by Anonymous

632.8 nm v1=?

503 nm v2=?

0.052 nm v3=?

2007-11-06 12:23:14 · 2 answers · asked by Anonymous

I will give best answer whoever can balance this equation first

Cu + HNO3 ---> Cu(NO3)2 + NO + H20

2007-11-06 12:11:51 · 2 answers · asked by Anonymous

I'm helping my best friend with her science homework. We need help. I really need some info on brain cells and any other info related to the question. It's for the Research Report. Plz help us. INFO NEEDED ASAP! :(

2007-11-06 12:11:23 · 1 answers · asked by Anonymous

a) what kind of atoms form molecular compounds?
b) how do the atoms in molecular compounds form stable electron arrangements?
c) what type of bond holds atoms together in molecules?

2007-11-06 11:51:41 · 3 answers · asked by Anonymous

0.15 M CaCl2

and

0.26 M Al(NO3)3.

Since the question is askingfor "all ions" am I to assume that I must multiply the molar amounts by avogadro's #?

2007-11-06 11:49:18 · 2 answers · asked by BugGurl 3

Why would a calorimeter be made out of two styrofoam cups instead of two metal cups??

I have some ideas but not sure...

2007-11-06 11:40:14 · 2 answers · asked by BowChicaBowWow 1

Ozone (O3) and oxygen gas (O2) are examples of

a. isotopes.
b. allotropes.
c. polymorphs.
d. alloys.
e. amphoterism.

2007-11-06 11:38:42 · 2 answers · asked by Anonymous

Hi im trying to conduct a scince expirement and i was wondering, why does salt dissolve faster in hot water than in cold? Your answers will be highly appreciated and i hope to find out soon!!

2007-11-06 11:30:54 · 3 answers · asked by farooha_97 2

Q part1: A solution of a hydrocarbon dissolved in benzene freezes at -0.51(degree celcius). What is the molality of this solution?

Q part2: If the solution in (Q part1) was made by dissolving 4.367gram of the hydrocarbon in 21.35gram of benzene, how many mole of hydrocarbon were dissolved in the 21.35gram of benzene? + what is the molar mass of hydrocarbon?

please help me.. thanks =D

2007-11-06 11:24:31 · 1 answers · asked by Kennedy 1

also if N= -3 and H= +3 why does it combined = NH(subscript3)

2007-11-06 11:04:38 · 2 answers · asked by livetolearn 1

For these questions.....please answer them step by step.

Q part1: A solution of a hydrocarbon dissolved in benzene freezes at -0.51(degree celcius). What is the molality of this solution?

Q part2: If the solution in (Q part1) was made by dissolving 4.367gram of the hydrocarbon in 21.35gram of benzene, how many mole of hydrocarbon were dissolved in the 21.35gram of benzene? + what is the molar mass of hydrocarbon?

please help me.. thanks =D

2007-11-06 10:46:46 · 2 answers · asked by Kennedy 1

2007-11-06 10:45:49 · 2 answers · asked by damron 3

I need help..
Thanks!

2007-11-06 10:32:13 · 2 answers · asked by Anonymous

2007-11-06 10:28:58 · 1 answers · asked by Jen P 1

belongs to which functional group?
Transferases? or lyase?

2007-11-06 10:22:11 · 3 answers · asked by sweetgirl78228 2

help me!!!!!!!

2007-11-06 10:18:47 · 1 answers · asked by Anonymous

In the hydrogen atom, what is the physical significance of the state for which n = infinity and E = 0?

2007-11-06 10:16:49 · 2 answers · asked by hahahahahaha 1

im doing a review packet for a test and i cant find the ACTUAL definition for
1. element
2. compound.
Please help. thanks ;)

2007-11-06 10:14:50 · 2 answers · asked by Anonymous

How does unequal sharing of electrons occur, and how does it affect molecules?

How are the formulas and names of ionic compounds written?

Please help! I have a quarterly 2morrow and it counts as 2 tests!!!

2007-11-06 09:58:14 · 2 answers · asked by Diane 2

I asked this question a couple of hours ago and got confused by all the answers, so if you know, can you carefully describe why for me? This is what i asked before...

This is in chemistry and we have been doing all sorts of molality equations and so forth and have just been given this problem and not quite sure i follow.

We are asked in question 4:

Part A
What are the six types of radioactive decay?
I found that they were...
α emission, (alpha)
β emission (beta)
γ emission (gamma)
positron emission
electron capture
spontaneous fission


But then it asks in part B of the question...

Complete the following nuclear equations
a. proton -> neutron + ?
b. neutron -> proton + ?
c. proton + ? -> neutron

am i supposed to use one of the following types of radioactive decay? thanks for the help and assistance!

2007-11-06 09:51:42 · 2 answers · asked by john s 3

2007-11-06 09:44:24 · 3 answers · asked by goldengurl706 2

2007-11-06 09:39:43 · 11 answers · asked by DeeDee 1

H3C6H5O7 + NaHCO3 ---> CO2 + H20 + Na3C6H5O7

plz balance this...ive been trying for like an hour..no joke. plz plz help!! Correct / Best answer will get 10 points!!!!! :D thank you!

2007-11-06 09:27:18 · 4 answers · asked by Rachel 2