Chemistry - November 2006

2006-11-25 18:42:01 · 1 answers · asked by Anonymous

2006-11-25 18:41:59 · 2 answers · asked by Anonymous

2006-11-25 18:41:51 · 4 answers · asked by Anonymous

2006-11-25 18:28:27 · 4 answers · asked by Anonymous

The specific heat capacity of iron at 25°C is 4.490×10-1 J/g/K.?

For a 9.75×102 g sample of iron, how much energy is required to raise the temperature from 20.2°C to 28.8°C?
(Assume that the heat capacity is constant over this temperature range.)
What is the molar heat capacity of iron?

2006-11-25 18:12:01 · 1 answers · asked by confused 1

A solution at 25 C is prepared by mixing 100 ml of liquid ethanol C2H5OH (density = 0.789 g/mL), with 200 mL of water (density = 0.997 g/mL). Assuming that the voumes add upon mixing, what are the molarity and molality of the solution, and the mass percent and mole fraction of the ethanol?

Step by step on how to do this problem would be greatly appreciated. thanks.

2006-11-25 17:34:54 · 2 answers · asked by vtxcuddlixgrl 1

ligand when descending the group in the periodic table from 3d series to 4d and the charge inceases on the metal cation

2006-11-25 17:06:18 · 5 answers · asked by mask 1

Ethiodized oil
- Iopanoic acid

2006-11-25 17:05:06 · 1 answers · asked by Anonymous

need to settle bet with loving wife can evaporation occur in a non oxygen atmosphere

2006-11-25 17:04:36 · 7 answers · asked by Anonymous

2006-11-25 16:32:13 · 6 answers · asked by haider b 1

2006-11-25 15:49:01 · 9 answers · asked by pimpindog 1

2006-11-25 15:47:48 · 4 answers · asked by George G 5

Can anyone else who has experienced this feeling please talk to me? I have been in college for 3 semesters now and I feel like it is turning me into a monster. I study all the time, because I truly want to learn my subjects and not just get points or good grades.
But I think my brain and my emotions are getting numb from studying and filling my mind up with nothing but chemistry and math. Is this a normal thing or my imagination?
I feel myself getting cold and withdrawn around my family. I don't want to be around friends or anyone. The last thing I think of before I go to sleep is numbers and reactions and equations and formulas. The first thing that pops into my head when I wake up in the morning is the crap I was studying the night before. When people are talking, and not necessarily to me but amongst themselves, I feel myself staring them down with a cold blank stare.
Is this caused by too much study? If I knew it was maybe it wouldn't bother me so much. Thanks!

2006-11-25 15:29:41 · 4 answers · asked by Anonymous

2006-11-25 15:23:33 · 2 answers · asked by Starmaster 2

Chlorine, which has an atomic mass of 35.435amu, has two naturally occurring isotopes, Cl-35 and Cl-37. Which isotope occurs in greater abundance? Explain.

2006-11-25 15:14:18 · 4 answers · asked by lovejessyloot 1

2006-11-25 15:13:57 · 2 answers · asked by Starmaster 2

I heard that a British spy was recently exposed (purposely) to the radioactive Polonium 210. I know that this is radioactive and it causes
cancer, along with other physical problems. Is Polonium 210 a radioactive element or isotope?

2006-11-25 15:07:35 · 6 answers · asked by Anonymous

importance of solutions

2006-11-25 15:06:12 · 3 answers · asked by ashley j 1

I realize that the compound As2O3 is an acidic oxide, but I am not quite sure what sort of balanced equation to use to prove its acidity. I am planning on using As2O3 + H2O, but I can't remember how to figure out exactly what this yields. I assumed that it was H3AsO4, but I couldn't balance the equation with this, so it seems as though it might yield H3AsO3. I should know how to formulate my balanced equation properly, but apparently I have forgotten what steps to take.

Am I using the right reactants? If so, what should my product be?

Thanks for your help. =)

2006-11-25 14:50:20 · 4 answers · asked by Anonymous

The system includes all that we wish to study.
A spontaneous reaction requires that the heat of the universe decrease.
Spontaneous reactions must be fast.
A closed system disallows the transfer of heat to the surroundings.
Thermodynamics describes the direction in which a reaction will proceed.

2006-11-25 14:14:46 · 8 answers · asked by confused 1

How would you write the net ionic eqations for these?

1. AlCl3 + NaCl -> AlCl3 + NaCl

2. FeCl3 + NaOH ->Fe(OH)3 + 3NaCl3

3. AgNO3 + NaCl -> AgCl +NaNO3

2006-11-25 13:57:01 · 1 answers · asked by ? 2

2006-11-25 13:50:01 · 4 answers · asked by Steven I 1

2006-11-25 13:37:06 · 3 answers · asked by Rosita D 2

2006-11-25 13:35:14 · 3 answers · asked by Debbie S 1

I need sites with articles and or magazines that talk about the following chemistry unit
1. Organic Chemistry
2. Structure and Properties
3.Energy rates and and rates of Reaction
4.Chemical System and Equilibrium
5.Electrochemistry.

2006-11-25 13:32:46 · 1 answers · asked by ayok 2

help please

2006-11-25 13:25:01 · 3 answers · asked by Anonymous

A 11.1 mL sample of a HCl solution has a pH of 2.000. What volume of water must be added to change the pH to 4.000?
mL

2006-11-25 13:12:38 · 1 answers · asked by smile 1

My chem class did an experiment using a test tube with CuSO4.5H2O layered with NaCl then water. Iron nails were placed in the water.

2006-11-25 12:35:08 · 1 answers · asked by Anonymous

and in english please

2006-11-25 12:18:49 · 3 answers · asked by tgtr2 1

For the following reaction at a certain temperature, it is found that the equilibrium concentrations in a 5.00 L rigid container are [H2] = 0.0500 M, [F2] = 0.0100 M, and [HF] = 0.400 M. If 0.150 mol of F2 is added to this equilibrium mixture, calculate the concentrations of all gases once equilibrium is reestablished.
H2(g) + F2(g) 2 HF(g)

[H2]
M
[F2]
M
[HF]
M

2006-11-25 12:16:33 · 1 answers · asked by tanny 1