Chemistry - January 2007

the problem is 5.25g/cm cubed and convert that to lbs./ft cubed.. can you solve it and help me how to do it? thanks

2007-01-17 05:03:42 · 2 answers · asked by Anonymous

For example:
"The enthalphy of reaction (H0rxn) for the conversion of cyclohexene to cyclohexane by hydrogenation is –28.6 kcal/mol and is –49.8 kcal/mol for the conversion of benzene to cyclohexane. Use these data to estimate the stabilization energy of benzene. "

2007-01-17 05:01:56 · 1 answers · asked by manuelkuhs 1

1 - Chemical reaction rates vary with the conditions of the change, but nuclear rates do not.

2 - Nuclear decay rates vary with the conditions of the change, but chemical reaction rates do not.

3 - Both chemical reaction rates and nuclear decay rates vary with the conditions of the change.

4 - Neither chemical reaction rates nor nuclear decay rates vary with the conditions of the change.

I want to say 4, but I am not sure.

2007-01-17 04:53:44 · 5 answers · asked by Julia 2

ELEMENT is the simplest form of matter and there are about 109 elements but only 92 of them occur naturally on earth;my question is then how are the other elements formed when an element is not made up of anything.

2007-01-17 04:53:41 · 6 answers · asked by SIm 1

...that is stable with an extra electron. When sodium chloride is dissolved in water does the sodium regain it's electron and will have just as many electrons as protons and floats freely. If so, where does the "shared pairs of electrons" come in?

2007-01-17 04:51:42 · 2 answers · asked by Lisa 1

Manganese electronic configuration is 1s(2)2s(2)2p(6)3s(2)3p(6)4s(2)3d(5).. what is its quantum numbers? TY! () means superscript... I got a hard time knowing its quantum number.. will i base it on 4s(2) or 3d(5)? thank you very much. Reply as soon as possible.

2007-01-17 04:49:32 · 2 answers · asked by slashfire_manuel 1

cell like a battery cell

2007-01-17 04:46:50 · 6 answers · asked by obcasino 1

I've been doing some homework and trying to find just a flat-out explanation for this but can't...what's the real reason?

2007-01-17 04:46:44 · 4 answers · asked by Anonymous

or something i didnt mention?

2007-01-17 04:24:33 · 4 answers · asked by Anonymous

Calculate the heat required to convert 27.9 g of propyl alcohol, C3H8O, from a solid at -147°C into the gaseous state at 111°C. The normal melting and boiling points of this substance are -127°C and 97°C, respectively. The heat of fusion is 86.2 J/g, and the heat of vaporization is 694 J/g. The specific heats of the solid, liquid and gaseous states are, respectively, 2.36, 2.83 and 1.76 J/g/K.

2007-01-17 04:22:03 · 4 answers · asked by Anonymous

1 - Chemical reaction rates vary with the conditions of the change, but nuclear rates do not.

2 - Nuclear decay rates vary with the conditions of the change, but chemical reaction rates do not.

3 - Both chemical reaction rates and nuclear decay rates vary with the conditions of the change.

4 - Neither chemical reaction rates nor nuclear decay rates vary with the conditions of the change.

I want to say 4, but I am not sure.

2007-01-17 04:21:53 · 3 answers · asked by Julia 2

How to use Molecular sieves to dry an organic solvent? Also, how to recover the Molecular sieves after use? Thanks for help. Appreciate if can provide related reference.

2007-01-17 04:21:37 · 7 answers · asked by SS 2

The options are -
1 - magnetize small particles.
2 - speed up small particles.
3 - slow down reaction products.
4 - reproduce reaction conditions found in nature

Not sure if it was 2 or 4. - Thanks!

2007-01-17 04:12:12 · 4 answers · asked by Julia 2

The half-life of a radioisotope of tritium, or hydrogen-3, is 12.32 years. After about 37 years, how much of a sample of tritium will be left?

1 - one-eighth
2 - one-fourth
3 - one-third
4 - one-half

2007-01-17 04:06:41 · 4 answers · asked by Julia 2

2007-01-17 04:02:41 · 5 answers · asked by Julia 2

A. Consider the combustion of ethylene, C2H4 (g) + 3O2 (g) --> 2CO2 (g) + 2H2O (g). If the concentration of C2H4 is decreasing at the rate of 0.23 M/s, what are the rates of change in the concentration of CO2 and H2O?

B. The rate of decrease in N2H4 partial pressure in a closed reaction vessel from the reaction N2H4 (g) + H2 (g) --> 2NH3 (g) is 45 torr/hr. What are the rates of change of NH3 partial pressure and total pressure in the vessel?

2007-01-17 04:01:47 · 2 answers · asked by bosox1989 1

2007-01-17 03:51:49 · 4 answers · asked by rohitgabaa1990 2

and if it has a valence of 4, 5, 6, or 7 it wil be stable as an anion?

2007-01-17 03:49:10 · 1 answers · asked by Lisa 1

2007-01-17 03:43:34 · 4 answers · asked by Anonymous

could you also give me some sources,

2007-01-17 03:32:04 · 7 answers · asked by some dude 2

2007-01-17 03:13:15 · 5 answers · asked by some dude 2

water molecules.



detergents, hydrophilic, hydrophobic, ionic

2007-01-17 02:59:20 · 5 answers · asked by Anonymous

Okay - who knows what this compound is ???

2007-01-17 02:58:42 · 3 answers · asked by tmel123 2

covalent bonds, ionic bonds, valence shells, or hydration shells.

2007-01-17 02:57:59 · 1 answers · asked by Anonymous

H2

or


CH4


or


BH3


or



CH3OH

2007-01-17 02:56:28 · 2 answers · asked by Anonymous

water

oxygen gas

glucose

carbon dioxide

2007-01-17 02:53:25 · 3 answers · asked by Anonymous

The product that you add shouldn't be hazardous to the skin, or any contact with hair, etc.

2007-01-17 02:51:45 · 1 answers · asked by Paulo M 1

1. They have different numbers of electrons than other atoms of the same element.


2. They have different numbers of protons than other atoms of the same element.


3. They have different numbers of neutrons than other atoms of the same element.


4. They have different reactivities than other atoms of the same element.

2007-01-17 02:50:44 · 2 answers · asked by Anonymous

Blueprint paper can be made by soaking paper in a brown solution of [Fe+3(CN-)6]-3 and iron (III) ammonium citrate. Wherever the paper is exposed to bright light, the paper turns blue. Explain why this happens.

2007-01-17 02:45:29 · 1 answers · asked by John C 2

I have 7 Black and decker 18 volt for lawn work,they all show fully charged,but only work for a few minutes :-( at $40 BUCKS A POP) to replace,I need your advice. Thanks

2007-01-17 02:39:25 · 4 answers · asked by 00chance 2