Chemistry - August 2006

2006-08-20 00:40:16 · 19 answers · asked by Anonymous

2006-08-19 23:45:38 · 4 answers · asked by cosmosgaobine 1

2006-08-19 23:40:30 · 14 answers · asked by segolame o 1

2006-08-19 23:30:41 · 10 answers · asked by segolame o 1

i dont know y i am not good in science .i forget things or get confused (of what i have learnt) very fast. plz help me

2006-08-19 23:23:43 · 15 answers · asked by Anonymous

2006-08-19 22:33:13 · 6 answers · asked by sid 1

hope i put this question in the correct catagory..just wantd to know if dna testing is accurate....why...i had a paterntiy test done with a man that is possibly my biological father...

2006-08-19 21:59:49 · 9 answers · asked by Jenny 3

I would like to ask the following 3 questions:

what is the answer if you are asked to arrange the pH of NH4Cl, NaCl, HCl, H2SO4 and NaCH3COO in descending order (all are aqueous solution and 1M)?

which of the the four 1M solution of the following salts has the highest pH , NaNO3, Na2CO3, NH4Cl, NaHCO3?

How do you determine which of them have the highest pH, especially those NH4Cl, NaNO3, NaCl (not typical acid or alkali like HCl or NaOH)?

thanks a lot

2006-08-19 20:42:13 · 4 answers · asked by nilbore 1

Is it possible to convert heat into energy if there is not a heat differential? If not, why? If you quote laws of thermodynamics, please explain exactly how they apply. Also explain how it applies to a geothermal power plant.

If that’s not possible, then is it possible to create a heat differential using energy, and then convert the heat to energy and end up with a total lose in heat and a gain in energy.

Example: Two rooms are 80 degrees. Use energy to cool one room to 75 while raising the other side to 90. Now convert the heat in the 90 degree room to energy while raising the temperature in the 75 degree room. Resulting temperature in both rooms at 79. The net heat decreased, therefore the net energy produced must have increased. Please explain the flaw and why? Thanks.

2006-08-19 19:30:11 · 3 answers · asked by Michael M 6

2006-08-19 19:00:18 · 1 answers · asked by Brandon K 2

for example, the specific heat capacity of freon-11 is 0.87 J/gK. if i am given a mass of 10.0 g to work with, do i have to convert it to gK? if so, how?

2006-08-19 17:40:21 · 2 answers · asked by asperity 2

Propane, C3H8, is a gas at room temperature; hexane, C6H14, is a liquid; an dodecane, C12H26, is a solid.

could someone explain why this statement is true? thanks in advance.

2006-08-19 16:33:38 · 2 answers · asked by asperity 2

2006-08-19 15:31:16 · 13 answers · asked by Anonymous

2006-08-19 12:14:08 · 6 answers · asked by how1andwhy2 2

please tell me all u know

2006-08-19 11:44:46 · 9 answers · asked by Brandon K 2

I need the chemical equation of this problem. It has to work and I'm not typing it in wrong. How would you represent the words with compounds?

Sulfuric Acid decomposes into its nonmetal oxide and water

2006-08-19 10:10:51 · 10 answers · asked by bookwurmgurl 2

I mean, you just bend the glow stick and it lights up. How does it work?

2006-08-19 10:06:21 · 8 answers · asked by hawaiian_shorts91 3

2006-08-19 09:48:40 · 6 answers · asked by bert 1

Here's the word problem, make sure I even wrote it out right. If it's right, I can't balance it.

Sulfuric acid decomposes into its nonmetal oxide and water

H2SO4 --> SO + H2O

I can't balance it! Please help!

2006-08-19 08:31:06 · 11 answers · asked by bookwurmgurl 2

Here's the problem:

Sodium oxide is mixed with water to form the metal base.

Please help. You don't need to balance it, I can do that!

2006-08-19 08:21:58 · 14 answers · asked by bookwurmgurl 2

2006-08-19 08:19:12 · 20 answers · asked by vsgr06 2

> = "greater than"
"you" = "the refiner or refinery"

Short way to ask the same Q: Why is there a volumetric gain when processing crude oils through a refinery?

TWH 08182006

2006-08-19 07:31:27 · 6 answers · asked by Anonymous

I expect a brief answer

2006-08-19 06:07:16 · 11 answers · asked by Anonymous

2006-08-19 04:24:59 · 25 answers · asked by iceman 1

2006-08-19 03:53:48 · 14 answers · asked by tranquility 2

i don't even know what to do...i tried just multiplying all of them but it didn't work..so i guess i have to do some conversions but i don't know how...HELP!!!!

2006-08-19 03:43:12 · 7 answers · asked by Anonymous

Bill finds an unusual object and wishes to calculate it's density. He discovers a problem of accurately weighing it, because it won't stay on the weighing pan. To solve this he adds the object to a beaker containing 75 mL of distilled water and finds the water level rises to 165 mL. The flask of water weighed 471 grams after the object was added. If the empty beaker weighed 277 grams, calculate the following

The weight of the water:______ g
The weight of the object:________ g
The volume of the object:_______ cm3
The density of the object:_________ g/cm3

2006-08-19 03:41:08 · 4 answers · asked by Anonymous

In a activity to test the temperature of water freezing to ice must added salt.Teacher says salt were decrease the temperature.But how it decrease the temperature of a liquid?

2006-08-19 03:26:34 · 6 answers · asked by kerk 1

Today teacher is teaching about pH.pH is means the power of acid and alkali.I ask the teacher why the p must be small letter and H must be capital letter.My teacher don't know the answer.So have someone help to solve the question.

2006-08-19 02:50:13 · 10 answers · asked by kerk 1

2006-08-19 02:34:30 · 18 answers · asked by bigal363@verizon.net 1