Chemistry - July 2007

LD(subsript) 50?

2007-07-24 17:52:54 · 10 answers · asked by baby_princess_melissa 2

Gaseous Mixture has 6.91g of N2, 4.71g of O2, and 2.95g of He. What volume does this mixture occupy @ 28C and 1.05 atm pressure? Please show me how you got this answer. I am thinking I need to convert the grams to moles? Thank you!

2007-07-24 17:50:59 · 1 answers · asked by susanstudio2000 1

2007-07-24 16:46:16 · 5 answers · asked by Anonymous

new acronym for diatomic molecules..

2007-07-24 15:31:11 · 3 answers · asked by Anonymous

what are ALL the subatomic particles, including ones scientists dont know much about, and the ones the textbooks dont bother to mention.

What are those particles (electrons, protons, neutrons, quarks, ect) made of?

2007-07-24 15:27:08 · 5 answers · asked by <⌘۞⌘> 2

a. a triple bond exist between the two nitrogen atoms
b. the bond takes places between two non metals
c. the bond is an example of non polar covalent
d. rearrangement of the electrons around each nitrogen must take place to comply with the octet rule ( I think this is correct)
e. all of the above are correct

2007-07-24 14:39:31 · 4 answers · asked by webbbattery 1

The earth receives 1.8 1014 kJ/s of solar energy. What mass of solar material is converted to energy over a 24 h period to provide the daily amount of solar energy to the earth?

I believe you have to use E = MC^2 but am not sure how to get the units right (i need answer in kg)

2007-07-24 14:11:56 · 2 answers · asked by Anonymous

In energy terms, ionization of an electron in an atom corresponds to the transition from whatever quantum state the electron is in to an energy of 0 kj/mol. calculate the energy in joules needed to remove one electron in the n=1 state from a hydrogen atom.

N=1 is -1312.04 kj/mol, but i have no idea what the question is asking me? help!!

2007-07-24 14:01:29 · 1 answers · asked by Irene C 1

2007-07-24 13:58:47 · 1 answers · asked by rionaerith 1

sodium acetate at a fair price and apart from online?

2007-07-24 12:52:14 · 3 answers · asked by franevilbob 3

Cu(IO3)2

CaTe

Cs2SiF6

2007-07-24 11:06:22 · 3 answers · asked by the1wasted_guy 1

it's random i know but...

2007-07-24 10:39:55 · 11 answers · asked by Amanda 1

I heard somewhere you can get it by the drips from the faucet or something like that, but I need to confirm it. How else can you get it besides buying it. Please help!

2007-07-24 10:33:22 · 4 answers · asked by Anonymous

what are the meaning of these properties?
and
what does each property measure ?

1. specific heat
2. modulus of elasticity
3. heat of vaporization
4. viscosity
5. coeefficient of thermal expansion
6. density
7. resistively
8. hardness
9. turbidity
10. heat of fusion
11. youngs modulus

2007-07-24 10:10:12 · 2 answers · asked by linifer74 1

2007-07-24 09:37:38 · 4 answers · asked by D 1

2007-07-24 08:32:32 · 4 answers · asked by jordan k 1

observed lines when hydrogen is excited in a discharge tube (using a prism), we see violet, blue-green, and red as the brightest and some other very dim colors.
the question is:
can you think of one or more likely explanations of the origin of the variation in the observed intensity of the colors?

thanks!

2007-07-24 07:37:13 · 4 answers · asked by k_mal116 1

I really need help with a water titration question, if someone would be kind enough to e-mail me at mcgowacd@Jmu.edu i'd greatly appreciate it. I'll then e-mail you my question or we could talk about it over msn, yahoo messenger, or aim. I basically have to find out the amount of calcium in my water, I'm pretty sure I have all the information to be plugged into the equation, but its just boggling my mind. Thanks, Chris

2007-07-24 07:33:24 · 3 answers · asked by Anonymous

equation : NaHSO4 =Na + H+SO4

2007-07-24 06:48:58 · 6 answers · asked by Neha B 2

oxalic acid- H2C2O4 • 2 H2O, MW=126.0 g/mol
-This acid has 2 replaceable acidic protons.
-what would be the normality of the acid?

2007-07-24 06:39:31 · 3 answers · asked by Anonymous

2007-07-24 06:39:11 · 3 answers · asked by Neha B 2

I'm having a hard time balancing two chemical equations...

The first is the chemical equation for the reaction that occurs between nitric acid and magnesium hydroxide. I think the unbalanced equation is : HNO3 + MgOH = MgN + H2O.

The second is for the reaction between HNO3 and PH3.

Any help balancing these equations is deeply appreciated.

2007-07-24 06:24:56 · 5 answers · asked by columbia11 2

I wonder why alcohol can act as a fuel. When it burns. it provides energy? I am not sure. I wonder why alcohol can motivate an engine.

2007-07-24 06:14:13 · 6 answers · asked by Anonymous

My classmates said that lithium could not react with water.
But if I really want it to react, can I add something to it?
Perhaps I overheard that they would add iodine......
Yet I am not sure. Suppose lithium is not reactive enough, right?/

2007-07-24 06:09:03 · 8 answers · asked by Anonymous

2007-07-24 05:55:19 · 10 answers · asked by Goldfish 2

2007-07-24 05:24:49 · 7 answers · asked by Anonymous

After scanning around some previous questions, is an element's Oidation# the same as its Valence Electron#?

2007-07-24 05:13:11 · 5 answers · asked by gridagent 3

im wondering if there is anything in a aerosol spray like the cstuff women put on there face and it hardens and then they peel it off?i have an idea for an invention but i need sumething like plastic our rubber sumething like that. that can be sprayed on.

2007-07-24 05:13:08 · 1 answers · asked by derrik 2

2.8
6.8
7.2
11.2

2007-07-24 05:07:22 · 7 answers · asked by Anonymous

5.0 ´ 10-23 M
2.0 ´ 10-6 M
5.0 ´ 10-9 M
2.0 ´ 108 M

2007-07-24 04:41:59 · 1 answers · asked by notachemwiz 1