Chemistry - March 2007

DMSP plays a role in the metabolism of algae with subsequent important repercussions in ecology.

2007-03-03 20:30:18 · 2 answers · asked by Len M 3

you have 10mL of saturated calcium hydroxide and you add 40 drops of phosphoric acid to it. you mix the solution after each drop is added. What is the conductivity of the solution after the drops are added?

2007-03-03 20:13:52 · 6 answers · asked by Marvin G 1

a) lead acetate

b) aluminium sulfate

c) Fe2S3 (I need the name of this one)

Thankyou. I can't work these ones out. I got most of the other ones. Thanks.

2007-03-03 19:49:15 · 4 answers · asked by Anonymous

sugar is very soluble in water and timber has signifcant structrual strength. what is the common link between these two observations? account for the observed properties

2007-03-03 19:38:24 · 2 answers · asked by Anonymous

x-ray diffraction reveals that there are two different bond lengths in a crystal of iodine I2. explain this observation and outline which bond type you would expect to be responsible for the shorter and longer bonds

2007-03-03 19:34:48 · 4 answers · asked by Anonymous

an organic chemistry student dissolved .095g of a crude product in 3.5ml(the minimum amount required) of ethanol at 25 C. He cooled the solution in an ice-water bath for 15 minutes and obtained beautiful crystals. he filtered the crystals on a hirsh funnel and rinsed them with about .5ml of ice cold ethanol. after drying the weight of the crystals was .005g. why was the recovery so low?

2007-03-03 19:26:48 · 3 answers · asked by Anonymous

Which statement about the hydrations of sulfur trioxide is correct?
SO3(g) + H2O(g) ---> H2SO4

delta(H) = -227 kJ/mol, delta(S )= -309 J/mol-K


A.At 1,000oC, G = 1.98 X 105 J/mol.
B.The reaction would be at equilibrium at about 735 K.
C.The reaction is spontaneous at 1,400 K.
D. deltaG can be negative only at high temperatures.
E. None of the above


Well this little bugger is making me angry. I'll try to show you what I did step by step.

1st scenario: At 1000 C , equation would look like.
deltaG= -227kJ/mol - 1273K * (-.309kJ/mol*K)=166
NO Match

2nd scenario:
deltaG= -227kJ/mol - 735K * (-.309kJ/mol*K)=.115
No Match

3rd scenario.
deltaG= -227kJ/mol - 1400K * (-.309kJ/mol*K)=205.6
Nope

4th scenario
Well according to my notes, deltaG is positive at high temperatures.
Nope

5th scenario: None of the above.
Since all others didn't make sense , I went with this answer:


But guess what??? I was wrong.

What did I do wrong? I went over it

2007-03-03 18:54:55 · 2 answers · asked by Anonymous

Identify how salt affects the corrosion of iron and write a short intro concerning what is known about salt and corrosion.

I need it in simple terms, so a kid who knows basically nothing about science can understand. thanks

2007-03-03 18:23:04 · 7 answers · asked by ? 6

An important process for the production of acrylonitrile C3H3N is given by the following reaction
2C3H6 + 2NH3 + 3O2 --> 2C3H3N + 6H2O
A 150 -L reactor is charged tot he following partial pressures at 25 C
P(C3H6) = .5 MPa
P(NH2) = .8 MPa
P(O2) = 1.5 MPa
What mass of acrylonitrile can be produced from this mixture (MPa = 10^6 Pa)?

How should i go about to complete this problem?
I'm thinking about converting all the reactants into moles and than using the one that gets used up first, see how much moles of acrylonitrile are forms and change that into grams for the answer.

2007-03-03 18:17:11 · 2 answers · asked by Anonymous

Is there a way to cut it easily without a saw or a laser?

2007-03-03 17:58:57 · 5 answers · asked by tallskinnybrunnettesrsxy 2

2007-03-03 17:50:16 · 1 answers · asked by Professor 1

2007-03-03 17:18:04 · 2 answers · asked by Jackie G 1

2007-03-03 17:15:52 · 8 answers · asked by BHABENDRA KUMAR D 2

2007-03-03 17:15:26 · 3 answers · asked by wzerocx 2

2007-03-03 17:12:12 · 2 answers · asked by idk 3

Can anyone tell me the chemistry behind?

2007-03-03 16:58:01 · 1 answers · asked by anwar r 1

I put CuCO3 in a test tube. and limewater, Ca(HO)2, in another test tube. I connected both test tubes with a rubber stopper, the rubber end in the tube w/ CuCO3.

I then heated the test tube w/ CuCO3 and a gas traveled through the rubber stopper into the other test tube, which contained Ca(OH)2. The gas gave the limewater a cloudy apperance indicating the presence of CO2 in the limewater.

I saw the chemical reaction, but I have NO clue of how I would write the equation. Could some one please help me figure out how to write the equation?

2007-03-03 16:51:07 · 1 answers · asked by Samantha C 1

2007-03-03 16:41:27 · 21 answers · asked by tim 3

i just found out how to do the electron configuration of an antomic number now i dont understand how and wat the orbital diagram means...can anyone explain it or find me a link that shows how to do it

2007-03-03 16:24:36 · 3 answers · asked by orange_crush_05 6

im doing a assignment and im rusting a mteal can what does corrosion mean?

2007-03-03 16:09:54 · 4 answers · asked by Anonymous

I tried searching on the web, but they don't say exactly why acid causes blue litmus paper to turn red. Have you guys got any idea? Any help would be appreciated!

Along with it, you can also answer why red litmus paper turns blue when it touches basic solutions.

2007-03-03 16:06:38 · 3 answers · asked by tim 3

It seems easy at first but then later I don't see any patterns. Everything just gets mixed up. So how do you use noble gas notations?

2007-03-03 16:05:24 · 4 answers · asked by Anonymous

or do you have to do something more complex to get the job done?

2007-03-03 15:57:13 · 8 answers · asked by COOL KID 2

Total confusion for me. What do I need to do first? Check to see if it is balanced or no?

In the acetylene torch, acetylene gas (C2H2) burns in oxygen to produce carbon dioxide and water.
2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(g)

(a) How many moles of O2 are needed to react with 2.00 moles of C2H2?

(b) How many moles of CO2 are produced when 4.5 moles of C2H2 reacts?

I can't breath

2007-03-03 15:15:47 · 2 answers · asked by Mickey C 1

Okay, I've always been having trouble creating chemical equations. Can someone please help me! For example, I need to write a balanced equation for the dissolution of sodium carbonate in water. I know the reactants would be Na[2]CO[3] and H[2]O, but I do not know how to predict the products!

2007-03-03 15:11:42 · 3 answers · asked by COOL KID 2

suggest at least 3 reasons^_^.or post the links^^
thankyou

2007-03-03 15:07:17 · 2 answers · asked by for2000 3

Cu(s)+2H2SO4(ag)----> CuSO4(ag)+2H20+SO2 (g)

This is a big equation where do I start and how do i get the end result which is "Some of the S atoms in the H2SO4 are reduced to for SO2. (+6 to +4)

2007-03-03 14:53:57 · 2 answers · asked by Toothie 2

What is odour. How it spreads into the air and sensible to human. Is it spreads as a particle, if so, then what about loss of energy and mass.

2007-03-03 14:51:26 · 6 answers · asked by Secretary, Consumer Movement 2

science project

2007-03-03 14:32:50 · 5 answers · asked by kay 2

Can someone please help me figure this out? How many moles are in 4.20 g of Ca(NO3)2?
and SO3? I keep coming up with the wrong answer.

2007-03-03 14:18:47 · 7 answers · asked by Mickey C 1