Chemistry - July 2007

more specifically, a globin such as cytoglobin or neuroglobin?

2007-07-10 07:17:48 · 2 answers · asked by Anonymous

2007-07-10 07:13:05 · 1 answers · asked by infinite201 1

What is the pH of a buffer solution prepared from 4.17 g of NH4NO3 (MM=80.04g/mol) and 0.20 L of 0.30 M NH3? What is the pH of the solution if diluted with pure water to 1000 mL? Kb = 1.8 x 10-5

2007-07-10 07:05:42 · 1 answers · asked by Anonymous

One formula is incorrect in each of the following groups. Pick out the incorrect formula and indicate why it is incorrect.
a. CO, CO2, CO3
b. PF3, PF4+, PF2, PF6

2007-07-10 07:00:58 · 1 answers · asked by Anonymous

I wish to work as freelance to pramote surfactants in paint ink,adhesives, agrochemicals & MWF.

2007-07-10 06:22:52 · 1 answers · asked by labh 1

What can we abserve from the reaction?what can we conclude from the experiment?

Concentration of reactants:Magnesium-Hydrochlor... acid system

1.the magnesium strip is add into different mole of Hydrochloric acid which is 6M, 4M, 3M and 1M.
2.Record the time for completion of the reaction.
Add the first magnesium strip to the 6M HCL solution,the time was recorded for all traces of the magnesium strip to disappear and repeat with 4M, 3M and 1M.

2007-07-10 06:16:09 · 2 answers · asked by ystan n 1

2007-07-10 03:17:31 · 5 answers · asked by Anonymous

plz..help me..

2007-07-10 01:55:49 · 6 answers · asked by natsumexmikan 2

what‘s different between alumina and Bauxite？
Are they smae or similar in industry？

2007-07-10 01:30:01 · 5 answers · asked by jkwunan 1

how do i calculate
1) number of moles for 3.01 times 10 to the power of 24
2)number of atoms of formula units in 7.5 moles of potassium bromide (KBr)

2007-07-09 22:18:53 · 2 answers · asked by ping 1

2007-07-09 20:10:18 · 2 answers · asked by Anonymous

Negative Control
Positive Control
Promoter
Enhancer
Operator
Operon

A. Binding sites for activator proteins
B. Noncoding sequence that makes where to begin transcription
C. When promoters and a set of operators control more than one gene
D. When regulatory proteins stop or slow gene action
E. When regulatory proteins promote or enhance gene action
F. Binding site for repressor

2007-07-09 18:39:12 · 1 answers · asked by Anonymous

mRNA codons
DNA codons
RNA anitcodons
amino acids

2007-07-09 18:24:48 · 3 answers · asked by Anonymous

How many moles are in the molecules shown.

1.5X10^20 (1.5 times 10 to the 20th power)

I've done the others by dividing with avogadro's number (6.02X10^23) but I was just winging it can't work this out.

2007-07-09 17:53:03 · 6 answers · asked by sly_roxx 1

2007-07-09 15:54:18 · 4 answers · asked by Curious 1

Ok people, how do you solve this problem and express it in correct scientific notation
(7.1*10-2) + (5*10-3) ?

2007-07-09 15:11:54 · 7 answers · asked by Anonymous

could an example of surface tension be filling a glass jar with water as high as you can without spilling it and adding pennies until water spills and then seeing how many pennies did it hold without spilling. Can surface tension also be filling a jar to the very tob and taking a needle and getting it to float on the surface of the liquid?

Can filling a cup 1/2 way with water and placin an ice cube in the water be an example of cohesiveness and highest density at 4 degrees Celcius?

Can dipping a clear straw with a small diameter about half way in water be an example of capillary action? Would the same thing occur if the tube had a diameter 5 times as large?

If you place a container of water on a hot stove until it reaches 100 degrees celcius in order to boil this gives water the property of high heat of vaporization but WHY does water need so much heat at the molecular level to change state?

what would be an example of high specific heat?

2007-07-09 15:10:25 · 2 answers · asked by maxfashun911 1

Camphor is a natural compound from a tree found in Java, Brazil, China, and other countries. A solution of camphor in ethanol is a mild topical antiseptic. One such solution contains 1.60 g camphor dissolved in 137 mL of ethanol (ρ = 0.785 g/mL). What is:

1.molality of camphor in the solution.
______m

2.mole fraction of camphor in the solution

3.mass percent of camphor in the solution.
______percent

2007-07-09 15:09:24 · 3 answers · asked by Anonymous

2007-07-09 14:49:43 · 3 answers · asked by yemi 1

What is the empirical formula for caffeine, ,it has 49.5% C, 5.15% H, 28.9% N, 16.5% O, molar mass is 195g/mol.

TY

2007-07-09 13:57:03 · 6 answers · asked by Imran 1

What does standardization of a solution mean?
How do we prepare a standard solution?
How do we calculate the concentration of the standard ethanoic acid?
What is the reacting ratio of ethanoic acid and sodium hydroxide?

2007-07-09 13:27:28 · 2 answers · asked by Anonymous

2007-07-09 12:25:12 · 6 answers · asked by DH 1

2007-07-09 09:32:50 · 1 answers · asked by Buck BUCK 2

2007-07-09 09:29:21 · 2 answers · asked by king of jersey 1

i need to know once and for all!!!!!!!!!!1

2007-07-09 09:11:24 · 11 answers · asked by Vampyre Chan =] 2

This is in a sealed container. 2 so3 is in equilibrium with 2 so2 and o2 (all gases) . 2 SO3(g)<~~~~>2 SO2(g) + O2(g) .The chemistry book say the answer is 0.338. For some reason i am getting either .100 or 6.35. Please help. The textbook is Chemistry central science by brown lemay bursten. 10th edition. Chapter15.5 practice exercise on pg. 645. Thank You.

2007-07-09 06:55:46 · 1 answers · asked by Anonymous

I want to learn every peice of info about the atom. From its protons to its structure to its energy and how it played a part in the atomic bomb. I just find it so fasinating how such small things can release such energy and how they are mostly empty space.

P.S. do you know any careers that might study this stuff? I am in high school and I want to have a career that deals with this stuff.

2007-07-09 06:47:30 · 2 answers · asked by Anonymous

2007-07-09 06:42:23 · 3 answers · asked by punjabi j 2

Can you please give me two liquids that can be seperated by the distillation process and can one of the liquids be something beginning with the letter "P" please! Also, when you have done that, please tell me which liquid reaches it's boiling point first (in degrees celsius) and when the other liquid reaches its boiling point second (in degrees celsius) Thanks!!!

x

2007-07-09 06:31:10 · 6 answers · asked by DK :) 2

It is determined to have a half-life of 100 years.What time is required to reduce an activity of 7.0 x 1012 disintegrations per min (dpm) to a harmless activity of
2 x10-3 dpm?

2007-07-09 06:14:14 · 3 answers · asked by its me 1