Chemistry - September 2007

How many grams of C2H5OH must be added to 83.2 g of water to make a 2.53 m aqueous solution of C2H5OH?

I can't figure out what I'm doing wrong...

2007-09-19 10:08:25 · 1 answers · asked by lub1210 1

Is it a solid, or a liquid, or is there a name for something in between?
How is it made up, molecularly?
Thanks

2007-09-19 09:04:47 · 6 answers · asked by Anonymous

what are the disadvantages of using mortar as a building material?

2007-09-19 09:03:22 · 2 answers · asked by Seevan. 2

2007-09-19 08:57:14 · 3 answers · asked by Anonymous

1.What is a cathode ray? Which subatomic particle is detected.


2.Which group of the periodic table is know as the noble gases, list them.

3.Distiguish between a sublevel and an orbital


Thanks so much! =)

2007-09-19 08:50:49 · 1 answers · asked by Anonymous

What is the molality of a solution consisting of 2.67 mL of carbon tetrachloride (CCl4, d = 1.59 g/mL) in 79.7 mL of methylene chloride (CH2Cl2, d = 1.33 g/mL)?

2007-09-19 08:46:52 · 2 answers · asked by Anonymous

I just don't really get it when my chemistry teacher explained it to us. The question on the homework is "Which gas has, under high pressure and low temperature, behavior closest to that of an ideal gas?" The choices are:
1. H2
2. O2
3. NH3
4. CO2

Can you tell me what the answer is and why?

2007-09-19 08:33:17 · 2 answers · asked by Meggie Beth 3

2007-09-19 08:30:37 · 3 answers · asked by mitchell_a_ok 2

The main reaction in Ph3COH and PhOMe to produce Ph3CPhOMe. This reaction fails in ethanol but proceeds in acetic acid. I don't understand why. I know that one is a reversible reaction and the other is irreversible. But why? any help is greatly appreciated.

2007-09-19 08:23:58 · 3 answers · asked by Anonymous

No answers, please. I just need to see the steps involved.

1. How many grams of SO3 (g) would be contained in 15.5L at 175kPa and 35.0˚C?

2. Calculate the boiling point of a solution containing 4.6mol of AlCl3 in 800g of water. (Kb for water = 0.512˚C/m)

3. A 0.150M solution of vinegar, CH3COOH, is only partially ionized so that the [H+] = 2.31 x 10-3M.

What is the Ka for this acid.

4. How many equivalents are in 15.0g of H3PO4?

I can learn how, but I need to see how it's done. The teacher can try to explain it all she wants, but I need to see it in order to understand it.

2007-09-19 08:07:30 · 2 answers · asked by Anonymous

whats the worlds most complex compound, known to date? most complex I have heard is botox (botulinum toxin) which has a chemical formula of C6760 H10447 N1743 O2010 S32.

sounds a bit complex. any others?

2007-09-19 07:16:46 · 2 answers · asked by Anonymous

What type of bond is (options are - ionic; covalent; or cov with H-bonds):
Vegetable Oil
Sucrose
Ethanol
Naphthalene
Glycerol

2007-09-19 07:07:13 · 2 answers · asked by Anonymous

What purpose does this ingredient serve in bath fizzers?

2007-09-19 06:58:08 · 5 answers · asked by pink_faerie_flower 2

What is the value of c in a vacuum? Give the numerical value as well as the definition

2007-09-19 06:57:50 · 3 answers · asked by kyle p 1

I agree that most cosmetics are dangerous to some degree because there are no regulations, but this seems a bit alarmist.

http://www.cosmeticsdatabase.com/

2007-09-19 06:15:29 · 2 answers · asked by parrisrose 2

2007-09-19 06:07:48 · 3 answers · asked by Seevan. 2

2007-09-19 05:42:54 · 1 answers · asked by RABBITTT. 1

Bromine has two naturally occurring isotopes ( Br-79 and Br-81) and has an atomic mass of 79.904 amu . The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%. Calculate the mass of Br-79? how do you find the mass.

2007-09-19 05:12:34 · 1 answers · asked by Chuck 1

Oxidation: 2H(2)O(2) --- 2 O(2) + 4H(+) + 4e-
Reduction: Fe (3+) + e- ---- Fe (2+)

Combine the two half reactions to obtain a balanced overall redox reaction.

**(All () numbers or symbols are () to show they are sub numbers and symbols)

If anyone has any suggestions I would really appreciate it! Thank you

2007-09-19 04:52:07 · 1 answers · asked by Mary 1

2007-09-19 03:51:50 · 6 answers · asked by Anonymous

its for school - thanks!

2007-09-19 03:25:35 · 1 answers · asked by Anonymous

the number of grams of KNO3 that will dissolve in 100g of H2O at 100 celsius.

the number of grams of water required to dissolve 20g of KNO3 at 100 Celsius.

the number of grams of water required to dissolve 2.0 g CuSO4 * 5 H2O at 100 celsius

the number of grams of water required at 100 celsius to dissolve a mixture containing 20 g KNO3 and 2.0 g CuSO4*5H20 assuming that the solubility of one substance is not affected by the presence of another.

2007-09-19 03:16:43 · 2 answers · asked by ineedhelpbadly 2

How many grams of water must be added to 4.19 g of AgNO3 to make a 0.171 m aqueous solution of AgNO3?

2007-09-19 03:15:28 · 1 answers · asked by lub1210 1

A. How many oxygen atoms are there in 15.00 grams of NO? Answer in Moles
B. What mass of oxygen is needed to react with 8.517 grams of ammonia?
C.How many moles of water are produced in a reaction in which 45.015 grams of NO are produced?
D.How many grams of NO are actually produced when 60.02 grams of ammonia are allowed to react with 96.00 grams of oxygen?

I am so lost and confused with these questions, any help would be greatly appreciated. Thank you!!! :)

2007-09-19 03:14:31 · 2 answers · asked by Mary 1

thompson conducted an experiment right?he said that the gas emitted rays which were negatively charged.but how did he know it was negatively charged?

2007-09-19 00:49:20 · 2 answers · asked by heiress 1

As above...pls help me answer my question...how does the above help to increase air ventilation and rid a room of any odour? Thanks!

(kinetic particle theory)

2007-09-18 23:59:35 · 1 answers · asked by SummerRains 2

Is it NO2?

2007-09-18 23:46:42 · 11 answers · asked by Average Joes 4

Chloride has a -1 charge, but what's the charge for silver?

2007-09-18 23:46:06 · 6 answers · asked by Average Joes 4

I have no clue what the name for this formula is.

2007-09-18 23:45:22 · 3 answers · asked by Average Joes 4

Is it phosphorus iodide?

2007-09-18 23:44:42 · 3 answers · asked by Average Joes 4