Chemistry - August 2007

what is its decay rate?

ok, what?

2007-08-06 17:18:10 · 1 answers · asked by who v 1

I place the same amount of gas in a one half liter container. When all other conditions are controlled for, shouldn't the temperature of the co2 gas in the second container be higher as more molecular collisions are occurring between paricles? And heat is "random motion of molecules" right? So when a gas is transferred to a smaller container, its temperature is raised, correct?

2007-08-06 17:02:13 · 4 answers · asked by kmm4864990 1

I'm curious!!!!

2007-08-06 16:08:39 · 5 answers · asked by Eugene 1

Especially this one.

Solutions of cobalt(II) nitrate and potassium hydroxide are mixed. I got this answer but my teacher says it is wrong... any ideas?
Co(NO3)2 (aq) + 2 KOH- (aq) > Co(OH)2 (s) + 2 KNO3 (aq)

2007-08-06 16:05:41 · 1 answers · asked by Anonymous

Also, what are the relative sizes of the atoms and their ions?

2007-08-06 15:43:51 · 2 answers · asked by thunderbomb90 3

If you pour a glass of Pepsi (mostly acidic) and rub your finger on your nose and get the oils on it (base) and touch the foam it eats away the acid. How does it happen? Shouldn't the acid eat away at the base due to the nature of the chemicals?

2007-08-06 15:19:58 · 4 answers · asked by Matt 2

could u please tell me how to make a lewis structure for these following formula.please show me detail.SO[not zero]2 ,CoCl2, ClF3 ,XeO3 RnCl2 BeCl2

2007-08-06 14:38:48 · 4 answers · asked by TOny 1

in kelvins and in degrees Fahrenheit?

2.The temperature in deep space is thought to be around 3k.
what is 3k in degrees celsius? in degrees Fahrenheit?

3.In an alcohol thermometer, the height of a constant amount of liquid alcohol in a thin glass tube increases or decreases as temperature changes. Explain the behavior of the alcohol using the folowing terms: lose energy, gain energy, volume(or space), movement, molecules(or particles).

2007-08-06 13:42:41 · 7 answers · asked by Anonymous

1.why are metals rather than ionic solids used in electrical wiring?

2.Explain why proteins and carbohydrates are polymers. what is each polymer made of?

3.The lenght of a bond depends upon its type. Predict the relative lenghts of the carbon-carbon bonds in the following molecules, and explain your reasoning.

H H H
| \ / H-C=C-H
H- C - C -H C=C _
| H/ \H
H
Ethane Ethene Ethyne

2007-08-06 13:27:05 · 2 answers · asked by Anonymous

2007-08-06 12:50:55 · 2 answers · asked by Anonymous

How many milliliters of a 135 mL solution of 0.8 M K3PO4 must be used to make 56 mL of a solution that has a concentration of 0.35 M K+?

2007-08-06 12:36:36 · 2 answers · asked by Liz 4

2007-08-06 10:14:09 · 8 answers · asked by jollyrancha243 2

I have no idea what Ka or Kb even is. I just need some help.

1. When 0.20 mol of lactic acid, HC3H5O3. is added to water to make 1.0 L of solution. The equilibrium hydrogen ion concentration is 5.3 x 10-3 M. What is the Ka of the lactic acid?

HC3H5O3 (aq) → H+(aq) + C3H5O3- (aq)

2. A 0.10M solution of formic acid has an equilibrium [H+] = 4.2 x 10-3 M. What is the Ka of the formic acid?

HCOOH(aq) → H+(aq) + HCOO- (aq)

3. What is the equilibrium hydrogen ion concentration of a 0.25M solution of carbonic acid, H2CO3? The Ka = 4.2 x 10-7.

H2CO3 (aq) → H+(aq) + HCO3-(aq)

4. What is the equilibrium for the hydroxide ion in a 0.10M solution of CN-? The Kb is 2.0 x 10-5.

CN-(aq) → OH-(aq) + HCN(aq)

5. What is the equilibrium concentration of hydrogen ion in a 0.10 M solution of propanoic acid, C2H5COOH? The Ka of propanoic acid is 1.8 X 10-5.

C2H5COOH(aq) → H+(aq) + C2H5COO -(aq)

Any help is appreciated

2007-08-06 10:06:38 · 3 answers · asked by Anonymous

2007-08-06 09:47:01 · 2 answers · asked by Anonymous

and what are there uses

2007-08-06 09:46:51 · 6 answers · asked by linifer74 1

2007-08-06 08:32:19 · 2 answers · asked by Anonymous

Is SiO2 is being extracted on industrial level any where or its only a part of laboratory work. Does any body know about its price? please tell me!

2007-08-06 08:27:37 · 4 answers · asked by usman a 1

2007-08-06 07:54:41 · 6 answers · asked by Joel B 1

Just a few questions. I need to learn how to solve them.

1. The pH of a solution is 2.1, what is the [OH-]?

2. When [H+] = 4.28 x 10-10 M, what is pH and pOH?

3. The pOH of a solution is 11.5, what is the pH and [OH-]?

4. If the hydrogen ion concentration of a solution is 9.58 x 10-5 M, what is the pOH and hydroxide ion concentration?

5. The hydrogen ion concentration of a solution is 6.25 x 10-12 M, what is the hydroxide ion concentration, pH, and pOH?

The main thing I don't understand is the negative logarithm thing. Just an easy to understand explanation would be a life saver.

2007-08-06 07:45:35 · 4 answers · asked by Anonymous

2007-08-06 07:23:52 · 2 answers · asked by blossom 1

2007-08-06 04:56:16 · 4 answers · asked by Anonymous

Preparation

1. Mix thoroughly about 5grams of potassium chlorate with one gram of Mn Dioxide in a watch glass. Transfer the mixture into the ignition/generator tube. Heat the generator tube slowly. Allow few bubbles to escape before collecting oxygen into the test tubes. fill atleast 3 test tubes and cover with cork under water.

Properties
1. Uncork 1 test tube of oxygen and then insert a glowing splint. Observe
2. Place a small amount of S in the deflagrating spoon. ignite sulfur and tilt it into a test tube of oxygen. Take note of the odor of gas produced and add 5ml of water into the test tube. shake and test the sol with blue and red litmus. observe

3. ignite one end of strip Mg Ribbon and drop it into a test tube of oxygen. cool the tube and add 5ml of water. shake the mixture and test it with litmus paper, observe.

B. Preparation
1. How is O2 gas collected? Why could this method be done?
Describe the physical properties of O2?

2007-08-06 04:24:03 · 2 answers · asked by Daniel 1

2007-08-06 03:14:34 · 7 answers · asked by kath_leenss 2

I need help writing and balancing 2 neutralization reactions
I need 5 acid combinations

If anyone could help that would be great.

2007-08-06 03:08:01 · 2 answers · asked by Anonymous

please answer the questions you can answer...the most number and correct answer gets 10 points as a reward ^_^

1.) How do you precipitate group I cation such as Pb+2, Ag+1, and Hg+1

2.) What positive application for the presence of silver, mercury and lead?

3.) What is the purpose of centrifuge?

4.) What is the purpose of acidify?

5.)When do you know if your solution is acidic

5.) How do you test for complete precipitation??

Thnx in advance ^_~

2007-08-06 02:58:44 · 3 answers · asked by squall_cloud 1

pls help n tell me how?

2007-08-06 02:57:06 · 2 answers · asked by Anonymous

ok, in order to set things on fire you need energy (matches or something) and O2 (oxygen)..

so why wont water fire when we light it?? water consists of Oxygen????

2007-08-06 02:45:21 · 6 answers · asked by lupus 3

Marble, on heating, produces Calcium Oxide and a gas. If you add water to the calium oxide a Solid B forms. What is this Solid? Also, if you add excess water to this solid and filter a Solution C forms. What is Solution C?
Thankyou

2007-08-06 02:37:42 · 2 answers · asked by Questioner 1

An impure sample of barium hydroxide of mass 1.6524g was allowed to react with 100cm3 of HCL of concentration 0.200M.When the excess acid was titrated against NaOH, 10.9cm3 of NaOH solution was required.25.0cm3 of the NaOH required 28.5cm3 of the HCL in a separate titration.Calculate the percentage purity of the Ba(OH)2 sample.

2007-08-06 02:34:06 · 2 answers · asked by Emperor 3

yes. i need a list of uses of dyes
tanx
tom

2007-08-06 02:24:44 · 1 answers · asked by remo 2