Chemistry - June 2007

Fusion reactions require very high____?

2007-06-12 07:15:03 · 9 answers · asked by Anonymous

I really need help

2007-06-12 06:52:28 · 1 answers · asked by victoriannpadilla 1

When is a titration used?

2007-06-12 06:37:31 · 8 answers · asked by HEY 3

2007-06-12 06:36:54 · 4 answers · asked by Seungyong W 5

I have to make chemistry project under the topic
"Production of RAYON Fibres from FILTER Paper"
Please help if you have knowledge of the procedure for the same.

2007-06-12 05:54:49 · 2 answers · asked by Gogs 1

in my textbook it gives an explanation which is really confusing!!!! can someone please explain this to me in a really *simple* way?

The solubility of macromolecules (such as proteins) in aqueous solution is maintained by an ordered layer of water molecules. Salt ions vary in their ability to ‘compete’ for electrostatic interaction with water molecules (the so-called ‘Hofmeister series’) – ammonium and sulfate ions are more effective than many other ions and hence high concentrations of ammonium sulfate are commonly used to precipitate macromolecules (eg proteins) by competing for water molecules – the macromolecules lose their ‘hydration’, aggregate together and precipitate out of solution (often referred to as ‘salting out’).

thank u!! (:

2007-06-12 04:56:00 · 8 answers · asked by Anonymous

for chemistry gcse

2007-06-12 00:52:04 · 12 answers · asked by Anonymous

can you give me investigative project that is efficient to the economy?

2007-06-12 00:24:31 · 1 answers · asked by neil 1

May you please help me,it's urgent.

2007-06-11 23:54:22 · 4 answers · asked by Angel 2

the reading of an apparatus can read up to an accuracy of 0.01cm3...if it reading is 39.50cm3 can i write it as 39.5cm3....


my teacher say that it wrong...but i dont argree with it...

can anyone tell me the truth and give me the prove(to get the best answer)...tell me what is ur prove lor...

2007-06-11 21:44:11 · 5 answers · asked by red devil 4

2007-06-11 21:22:32 · 3 answers · asked by kirana 1

2007-06-11 19:39:41 · 2 answers · asked by vijay_abeera 1

4NaCL + 2SO2 +2H2O + O2 --> 2Na2SO4 + 4HCL

10 moles of each reactant, which will determine how much Na2SO4 is produced

100 moles " " Na2SO4 is produced

How do you determine this, Im assuming its looking for a limiter but I dont understand what to do next

2007-06-11 19:27:23 · 2 answers · asked by NeonLights 2

[IMG]http://i16.tinypic.com/4knzwuh.jpg[/IMG]

Its a single double bond cyclohexane ring with a -CHCH3 group and doublebonded to a methyl group.

2007-06-11 19:03:12 · 2 answers · asked by pepperspray 1

plzzzzzz answer it fast coz its my assignment

2007-06-11 17:45:19 · 10 answers · asked by Anonymous

for each compound please say if it is polar or not, what the molecular geometry is and explain the lewis dot for each please : NH2Cl, Cl2O, AsH5, AlH3, CCl2F2, O3

2007-06-11 17:42:01 · 2 answers · asked by razac24 1

For whatever the answer is, can you also explain why that's the answer?

2007-06-11 17:28:47 · 2 answers · asked by Anonymous

I am confused about how to balance equations... I am terrible with math and chemistry so it's hard to sort them out. I think the parentheses mix me up! If anyone can help I would really appreciate some step-by-step instructions. Thanks!

NaOH + Ba(NO3)2 ----> Ba(OH)2 + NaNO3

2007-06-11 17:15:40 · 7 answers · asked by sundance_0083 2

2007-06-11 15:47:49 · 7 answers · asked by Anonymous

true or false?

2007-06-11 15:15:59 · 7 answers · asked by wondering 1

2007-06-11 15:09:35 · 5 answers · asked by wondering 1

I found a formula of making a 1N Hydrochloric Acid, but I'm opting to make 12N solution. Can someone post an accurate solution or formula...

2007-06-11 14:50:58 · 2 answers · asked by +_+ 1

i'm not sure why a certain part is included in the solution...

20mL of 1.0 x 10^-4 M Ba(OH)2
mixed with
10mL of 0.0025 M Fe(NO3)2
will a precipitate result?

Here's the solution.

[OH] -> (.02 L / .03 L) x (1.0x10^-4 M Ba(OH)2) x 2

[Fe] -> (.01 L / .03 L) x (0.0025 M Fe(NO3)2

When finding [OH]..am I multiplying by 2 because of the 2 OH?

The Ksp for Fe(OH)2 is 5.0 x 10^-17.

Usually when doing these kinds of problems..I just multiply the concentrations and see if they are larger or smaller than the Ksp. I don't understand why you would multiply by 2

2007-06-11 14:36:23 · 3 answers · asked by Anonymous

2007-06-11 14:07:07 · 7 answers · asked by j baby 1

What is the molar mass of an ideal gas if 9.50 g occupies 3.73 L at 1418.35 torr and 12.8 degrees C ?

2007-06-11 13:28:01 · 3 answers · asked by Division12 2

2007-06-11 13:21:05 · 5 answers · asked by Anonymous

Expensive perfumes such as channel, escada, gucci , and others.
Like the general ones most carry?

2007-06-11 13:20:07 · 3 answers · asked by Meli 3

The fumes from this chemical can melt contact lenses while in a persons eyes. There is one more word in the name of the chemical...The first word being "methyl" , the next word is the name I am looking for, and the last word being "acolyte". It has a very strong odor resembling something between melting plastic and paint thinner. I would like to know the complete name of this chemical and any information on any toxicity levels related to inhaling the fumes from it or being exposed to it daily over a period of time.
It's main use is as a sealant for paved surfaces. It is extremely durable, retains some flex when dry, and does not absorb anything spilled on it. I have known of it having to be flown in from Germany for use in the U.S. It is very expensive.

2007-06-11 13:16:03 · 1 answers · asked by Brygirl 1

#1 For molecules to react, they must collide. An effective collision depends upon-
A. a molecule colliding with the wall of the container
B. three or more molecules colliding
C. Molecules having popular orientation only.
D. Molecules having proper orientation and enough energy
#2 Which of the following factors doesn’t affect the speed of a chemical reaction?
a. size of the beaker in which the reaction proceeds
b. Temperature
c. Nature of the reactants
d. Concentration
#3 A catalyst increases the rate of a chemical reaction by-
a. causing more collisions between molecules
b. increasing the energy of the particles in a reaction
c. lowering the activation energy of a reaction
d. raising the activeation energy so that the colliding molecules have more energy
#4 In a laboratory situation, the best way to determine is an acid or a base is to
A. taste the substance
B. touch the substance
C. test the substance with litmus paper
D. dilute the substance with excess water

2007-06-11 13:15:34 · 5 answers · asked by Anonymous

2007-06-11 12:55:05 · 2 answers · asked by summahhh! 4