Chemistry - May 2007

2007-05-16 19:13:37 · 7 answers · asked by Mahmoud A 1

2007-05-16 18:39:58 · 2 answers · asked by Anonymous

2007-05-16 18:34:27 · 1 answers · asked by bennico95 1

2007-05-16 18:31:28 · 2 answers · asked by Anonymous

2007-05-16 18:30:22 · 1 answers · asked by Anonymous

When molecules are reduced they generally gain energy. If reduction involves the addition of electrons, then the electrons add their energy to the molecule. However, a molecule is also reduced simply by adding hydrogens and removing oxygens. This does not add the energy of new electrons since the number of electrons does not change (assuming that the number of bonds doesn't change). Why then should the energy necessarily be higher simply because hydrogens have been substituted for oxygens? Example: Methane (CH4) has more energy than Carbon dioxide (CO2). Same number of bonds in each, carbons being double-bonded to each oxygen in CO2.

2007-05-16 18:14:14 · 3 answers · asked by davidr_222 2

2007-05-16 18:04:57 · 4 answers · asked by Justin P 1

2007-05-16 17:42:18 · 1 answers · asked by ronald m 2

and 49.49 percent iron. When this compund is decomposed into its elements, what mass of each element would be recovered?

2007-05-16 17:34:32 · 3 answers · asked by Bri 3

2007-05-16 17:26:14 · 7 answers · asked by garbageman881 1

2007-05-16 16:50:16 · 2 answers · asked by Anonymous

ripple is the ineffeciency of rectifier in converting AC to DC (i.e. some AC is in the DC output)
please include references if you can

2007-05-16 16:47:24 · 1 answers · asked by Anonymous

How many alpha particles and how many beta particles were emitted in all?

PLEASE HELP!

2007-05-16 16:27:35 · 1 answers · asked by veryconfused 2

I need some help well alot of help plzzzzzz



20. An ionically bonded substance and a covalently bonded substance. Label each with the substance it represents. Chemical formulas, common names and chemical names required.



36. A mixture which could be separated using paper chromatography. Define paper chromatography. Common name required.


43. A molecule with bonding that follows the octet rule. Common name, chemical name, chemical formula required.



50. The amount of NaCl produced from 10.0 g of sodium hydrogen carbonate reacting with an excess of hydrochloric acid. Assume 75 % yield. Balanced equation and calculations required. (no work, no credit, no kidding)



would you explain this 2 me also...i dont get any of them... :( im not good with chemistry things :(

2007-05-16 16:17:06 · 5 answers · asked by elaheh_hm 1

2007-05-16 16:03:34 · 1 answers · asked by aakash v 1

we prepare a solution of oxalic acid. we weigh 0.968g H2C2O4 x 2H2O and dissolve it in DI water using a 50.0 mL volumetric flask
1) What is the molarity of this oxalic acid solution?
2) What is the equation for the oxidation of the oxalic acid?
3) What is the normality of this solution?

2007-05-16 16:03:28 · 1 answers · asked by ediii69 1

2007-05-16 15:43:12 · 2 answers · asked by ANTONIO G 1

2007-05-16 15:34:33 · 3 answers · asked by Anonymous

a neutral solution?

2007-05-16 15:10:43 · 3 answers · asked by yowutsup911 1

2007-05-16 14:56:52 · 9 answers · asked by honey_serinity 1

Can you give me the basic formula on how to find half life

2007-05-16 14:06:39 · 1 answers · asked by serieafan89 2

2007-05-16 14:04:00 · 6 answers · asked by serene 1

thankss

2007-05-16 13:53:29 · 7 answers · asked by =) 4

can anyone show me how to do this??

How many kilograms of H2O must be added to 75.5 g of Ca(NO3)2 to form a .500 m solution???

2007-05-16 13:52:32 · 1 answers · asked by Anonymous

2007-05-16 13:44:04 · 2 answers · asked by Rebekah 1

2007-05-16 13:43:29 · 4 answers · asked by kmof6322 1

Please tell me. Also, I think it is plasma, But not the kind in blood. TELL ME!!!!!!

2007-05-16 12:45:38 · 15 answers · asked by ash 2

Will Ne, O2, H2 or CH4 (in 1.0L flasks) have the highest kinetic energy at 298 kelvin?? Help!

2007-05-16 12:30:52 · 1 answers · asked by soccerlover39 1

for element- actinium
- aluminum
- arsenic
-cobalt
-beryllium
-californium
thank you so much!!!!

2007-05-16 12:09:30 · 2 answers · asked by Anonymous

What is the value of OH- in a solution with a pH of 10


please help

thanx!!

2007-05-16 10:49:42 · 4 answers · asked by aqualung 2