Chemistry - June 2007

2007-06-18 18:57:09 · 3 answers · asked by Anonymous

first off, what is the molecule called??


H3C - - - CH - - - - CH2CH3
I
D....connected to the CH in the middle, sorry

What are all of its stereoisomers and absolute config for it??

PLEASE HELP ME!!! I AM CONFUSED WITH THIS ONE!! THANKS

2007-06-18 18:18:22 · 6 answers · asked by Anonymous

I took strike anywhere matches and I used a febreeze spray to make a flame thrower but the gas doesn't reach the matches and the spray liquid douses the flames. Can someone tell me what I am doing wrong?

2007-06-18 18:15:38 · 5 answers · asked by calvinatlan 2

Suggest an experiment to compare the reactivity of halogens using salts of sodium halides

thankyou!

2007-06-18 18:09:50 · 1 answers · asked by bashaprincess 2

a 238 ml sample of air collected at 35.O*C has a pressure of 388 torr. what will the pressure be if the volume is expanded to 444 mL at 23*C(degrees)

how do you know when you change
*c to K
or
torr to atm
etc

got any good websites?

2007-06-18 18:04:58 · 2 answers · asked by lo 2

If protons and neutrons each give one atomic mass unit to the weight of the atom, then why are the atomic masses listed on the periodic table not whole numbers?

2007-06-18 17:56:07 · 4 answers · asked by wonderwoman 1

I accidentally forgot that my torch lighter uses butane and put in regular lighter fluid. Is it bad to mix the two? if so, how do i remove the regular fluid? just.. use it up then replace it after it cools down?
I have not mixed them.

2007-06-18 17:41:00 · 4 answers · asked by BRX0102 2

My point is, if the ion has been removed from the solution there won't be any solution, leaving only the basic liquid in which the desolved ion has been.
Chemists out there please help.

2007-06-18 16:59:37 · 6 answers · asked by Zack J 3

In the fall I am going to be a junior in high school and I will start taking chemistry.
I want to be a doctor very bad and I know that it is important right now to learn a lot of science.
I want to start learning chemistry and other sciences before the school year starts so I will be even better at it.
Can someone recommend a website that I can go to to start learning basic chemistry??
thanks!!

2007-06-18 16:53:33 · 7 answers · asked by ♫amazing♫ 3

Does anyone know of a website or a book that can teach organic chemistry easily? I read my book constantly and I still have alot of problems bc I dont really understand much of what Im reading.

2007-06-18 14:41:58 · 3 answers · asked by Hello! 2

1)Benzoic acid
2)Benxonitrile

2007-06-18 13:42:58 · 2 answers · asked by goofy 2

2007-06-18 13:37:05 · 1 answers · asked by Khaled 1

4HCl(g) + O(g) <=> 2H20(g) + 2Cl(g)

If only 6.75 kcals were given off in this reaction, how many grams of HCl were used in the reaction?

let me know how to do this, please! thanks.

2007-06-18 13:36:37 · 1 answers · asked by Daniel G 2

2BN+3F2-->2BF3+N2

When 161.2g of BN are added to an excess of F2, a reaction occurs in which 326.118g of BF3 are formed.

Calculate theoretical yield of BF3 in grams.

What is meant by actual yield(formula)****

2007-06-18 13:31:09 · 2 answers · asked by m 1

NH3 + 5O2 --> NO + 6H2O

If we use 6.80g of ammonia, what mass of oxygen will be required to consume all the ammonia present?

Please show explanation

2007-06-18 13:29:03 · 4 answers · asked by Anonymous

Clausthalite is a mineral composed of (PbSe). The mineral adopts a NaCl type structure. The density of PbSe at 25C is 8.27g/cm3. Calculate the length of an edge of the PbSe unit cell.

2007-06-18 13:28:54 · 2 answers · asked by G 1

synthese following staring at Benzene?

Benzene ring where 1 is NO2 and 4 position is Cl

how you cna obtain this produch if your start from benzene ring.
answer in the back of the book is confusing
its says 1) 2 CH3Cl, AlCl3 ; 2) Br2, FeBr3

IUPAC name is para bromonitrobenzene

2007-06-18 13:25:45 · 1 answers · asked by goofy 2

2007-06-18 13:15:00 · 3 answers · asked by Khaled 1

The mass of a sample of a nickel (average atomic mass 58.69 amu) is 11.74g how many atoms does it contain?

Thanks

2007-06-18 13:02:06 · 2 answers · asked by Adam d 1

H-F, energy released=135
H-CL er= 103
H-Br er=87
H-I er=71

The table lists four different chemical bonds and the amount of energy released when 1 mole of each of the bonds is formed.

2007-06-18 11:58:53 · 4 answers · asked by Just a girl 2

an element crystalizes in a body center cubic lattice. The edge of the unit cell is 2.86angstrims, and the density of the crystal is 7.92g/cm3. What is the atomic weight of the element?

2007-06-18 11:58:38 · 2 answers · asked by G 1

2007-06-18 11:52:35 · 3 answers · asked by ^ Cho-chan ^ 2

The time it spends in going from 40 m/s to 60 m/s is:

a. 10 s
b. 15 s
c. 20 s
d. 25 s

2007-06-18 11:10:52 · 5 answers · asked by Anonymous

What are three properties of an acid..and three properties of a base?

How can the pH scale be used to classify substances?

2007-06-18 09:39:21 · 1 answers · asked by J-Rome 2

I have a science exam tomorrow and I would like this question answered. This is the question:

"If a chemical reaction were to occur between Calcium and Chlorine, how many chlorine atoms would join up with Calcium? Explain why."

I don't remember anything about this. I think the valence for Ca is 4, and as for Cl, it's 3, (I think) but can someone explain to me what happens? I know the answer is two. But I can't explain my answer.

2007-06-18 09:23:01 · 6 answers · asked by China Cup 2

In determining the head capacity (calorimeter constant) of a calorimeter, 50. mL of water at 56 degrees celsius is added to 50 mL of water at 23 celsius...After about five minutes of mixing the final temp of the solution inside the calorimeter reached 37 degrees celsius.... calculate the heat capacity of the calorimeter ( Joules per degree)

2007-06-18 08:51:05 · 1 answers · asked by af_woody1892 1

A sample of approximately 5 grams of sodium hydroxide (MM 40) was weighed on an electronic balance. Its mass was found to be 5.224 grams. This sodium hydroxide was dissolved in sufficient water to make 700 mL of solution. What is the molarity of the solution? Enter your answer with three significant figures.

2007-06-18 08:48:47 · 5 answers · asked by Division12 2

As an example, you have a 15.0 mL solution of a triprotic acid, H3A, with a concentration of 0.183 M. You titrate it with a 0.250 M solution of NaOH. How many millimoles of H3A are you titrating? (Give units)

2007-06-18 08:43:53 · 1 answers · asked by mosspoh 1

please complete the following reaction? thanks

2007-06-18 08:20:33 · 2 answers · asked by mommy Ty 3

What are the functional groups for the following molecules???
1) CH3 - O - CH3

2) Cl - CH2 - CH3

3) H - O - CH2 - CH3
.
4) NH2 - CH3
.
5) CH3 - C - CH3
.................O (D Bond)

2007-06-18 07:54:09 · 2 answers · asked by Anonymous