Chemistry - June 2007

How much pure alcohol must be added to bring the solution up to 27% alcohol?

2007-06-15 22:01:14 · 3 answers · asked by Anonymous

My friend told me he uses it as a substitute for salt. Ironic how we use the same ingredient for lethal injections!

2007-06-15 20:20:11 · 4 answers · asked by bleu 4

In a beaker, sugar is dissolved in water, and then the water is heated and evaporates. The sugar is recovered, and heat is again applied. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred?

the boiling point of waters
the boiling point of sugar
the temperature at which sugar evaporates
whether or not the black substance is sugar

1.the boiling point of waters
2.the boiling point of sugar
3.the temperature at which sugar evaporates
4.whether or not the black substance is sugar

2007-06-15 20:14:15 · 5 answers · asked by CDM 1

CO2= Carbon Dioxide
CoU= (oxidized copper
H2O= (distilled water)
H2O2 (hydrogen peroxide)
NaCl (sodium chloride)

2007-06-15 20:06:38 · 3 answers · asked by CDM 1

gotta know making comic and want it to be realistic

2007-06-15 19:59:03 · 10 answers · asked by Anonymous

Calculate each of the following quantities
volume of water added to 0.150 L of 0.0264 M sodium hydroxide to obtain a 0.0100 M solution (assume the volumes are additive at these low concentrations)

I have several other probelems that require conversions from/to molarity. So particular emphasis on how to use it as a conversion factor would be helpful. Thanks!

2007-06-15 18:32:41 · 4 answers · asked by Anonymous

chemistry experiment with house items.

2007-06-15 17:38:27 · 5 answers · asked by Lee Hal 2

2007-06-15 17:16:24 · 3 answers · asked by Anonymous

1. In pure water, what is the concentration of H3O+ and OH- ions? What is the pH?

2. What is the pH of a solution with [H3O+] = 1 x 10^-6 M? is it acidic or basic?

3. The pH of a solution devreases from 9 to 7. How does the concentration of [H3O+] ions change?

4. In a solution, [OH-] = 3.4 x 10^-10 M. What is the pH of the soltuioin? Is it acidic or basic?

2007-06-15 15:51:52 · 2 answers · asked by Anonymous

Why does some random guy who clearly never studied chemistry get the best answer for a chemistry question for which there was a simple, clear, chemical answer by a professional chemist. It wasn't even right.

2007-06-15 15:42:53 · 5 answers · asked by wheelintheditch 3

2007-06-15 15:24:11 · 3 answers · asked by rjo_ong 2

4.42 g of Ammonuim phosphate were dissolved in 20.0 L of water. How many moles of ammonium does the solution contain?

2007-06-15 15:13:43 · 3 answers · asked by Anonymous

13.4 g of a sample of a salt Na2S04. x H2O was found to contain 6.3 g of water. Determine the number of molecules of water of crystallisation.

2007-06-15 15:03:03 · 1 answers · asked by Anonymous

a) what is the chemical equation?

b) What is the general reaction type?

Thanks!

2007-06-15 14:48:42 · 4 answers · asked by gym guy 2

1) the empirical formula of cocaine

2007-06-15 14:48:03 · 1 answers · asked by Soni 2

a) what is the complete ionic equation for the reaction of Mg with HCl?

b) What is the net equation for the reaction of Mg with HCl?

c) What is the general reaction type?

Thanks in advance.

2007-06-15 14:40:22 · 1 answers · asked by gym guy 2

a) What is the complete ionic equation for the double displacement reaction that occurs when aqueous solutions of barium nitrate and sodium chromate are mixed?

b) Name the spectator ions in this chemical reaction

c) Write the net ionic equation for this reaction.

2007-06-15 14:31:27 · 3 answers · asked by gym guy 2

Is it mostly methane? Is this what causes the "stench"?

2007-06-15 14:03:11 · 3 answers · asked by strangledtilhereyesbugged 1

2007-06-15 13:03:23 · 5 answers · asked by Anonymous

I asked why when ice crean melts it gets warm, but when soup gets cold, it gets very cold. He explained that they both reach a plateau of room temperature, which makes sense. But personal experience tells me that I am not completely incorrect (cold things get warm and warm things get cold). His argument appeased me at the time, but I cannot remember the details. Can anybody use science to prove me right or wrong? (My original major was physics, so feel free to use as much scientific jargon as you please!) Thank you so much!!!

2007-06-15 12:18:42 · 5 answers · asked by Kate v.7.0 6

NEED SERIOUS HELP WITH CHEMISTRY HOMEWORK!!

If 26.42 mL of a standard 0.1650 M NaOH solution is required to neutralize 30.40 mL of H2SO4, what is the molarity of the acid solution?

2007-06-15 11:09:12 · 2 answers · asked by Anonymous

slope? (numerical value). This is regarding an experiment with Gay-Lussac's Law & Boyle's Law

2007-06-15 10:47:02 · 2 answers · asked by Anonymous

a. prevents drastic changes in pH in body fluids. b. is the product of a decomposition reaction. c. is something you put on your food (not the right answer :) ) d. dissociates into H+ and OH- in solution. e. is a product of the reaction of an acid with a base.
answer asap! im taking the test now! God bless

2007-06-15 10:46:46 · 2 answers · asked by I Love My Family 2

2007-06-15 09:23:21 · 4 answers · asked by neice_08 1

here are formulas
i have to find Pt = Pcan + Pbar
Pbar (barometric pressure) is 757.6 torr

P can = M to Kg x 9.8 m/s^2 all over A

A = V/h

2007-06-15 07:47:05 · 1 answers · asked by aznxbabi88 2

what r different types of diesel available n difference in their composition??explain the methods used to find the effeciency of petrol and diesel.is CNG an effective substitute for petrol and diesel??

2007-06-15 06:46:12 · 2 answers · asked by sumedha jain 1

2007-06-15 06:17:57 · 8 answers · asked by lirael1019 1

CH3CH(OH)CH3 ->H2SO4->HCOOOH-->CH3MgBr then

PCC AND CH2CL2

2007-06-15 06:16:23 · 3 answers · asked by Anonymous

So, I read that 100uM at 4uL = 0.4 nmol. I want to make 0.4 nmol with 200 uM at 2.0 uL. I came to 0.121mg/mL. Does this sound correct?

2007-06-15 04:48:28 · 2 answers · asked by Anonymous

2007-06-15 04:39:05 · 3 answers · asked by billsmugs 2