Chemistry - August 2007

Is sour milk, produced by the addition of mild acid (lemon juice or vinegar), alive?

2007-08-19 09:44:21 · 4 answers · asked by Anonymous

2007-08-19 09:36:50 · 0 answers · asked by lcm 1

The standard Gibbs free energy change for hydrolysis of fructose-1,6- bisphosphate (FBP) to fructose-6- phosphate (F-6-P) and pi is -16.7 kj/mol:

FBP + H20 -----------> F-6-P + Pi

The standard Gibbs free energy change for ATP hydrolysis is -30.5 kj/mol:

ATP + H2O -----------> ADP + Pi

The standard Gibbs free energy change for the phosphofructokinase reaction shown below, is which of the following.
ATP + F-6-P-------------->ADP + FBP

(a) -47.2 kj/mol
(b) +13.8 kj/mol
(c) -13.8 kj/mol
(d) none of the above

Does anyone which is the correct answer?
Thankyou,xx

2007-08-19 09:20:16 · 1 answers · asked by Anonymous

1. Will MnO4- oxidize Cr+3 to Cr2O7 in acidic solution? Explain your answer.

Reduction Potentials E°
Mn+2 + 2e-  Mn(s) -1.18
Cr+2 + 2e-  Cr(s) -0.91
Cr+3 + e-  Cr+2 -0.41
MnO2 + 4H+ + 2e-  Mn+2 + 2H2O 1.23
Cr2O7-2 + 14H+ + 6e-  2Cr+3 + 7H2O 1.33
MnO4- + 8H+ + 5e-  Mn+2 + 4H2O 1.51

2. Calculate the number of moles of CuBr which will dissolve in 0.010M HBr.
Ksp for CuBr is 5.3x10-9.

If someone could help me out it would be great. I've been at these for a while and I can't seem to get the correct answer that I have in my book.

2007-08-19 09:11:14 · 4 answers · asked by Sarah G 1

i need to know what's in vinegar,toothpaste, and ketchup that can clean silver or any kind of jewelry or even coins. help please. thanks.

2007-08-19 07:48:54 · 3 answers · asked by Anonymous

2007-08-19 07:28:03 · 2 answers · asked by mohamoud i 1

ang what's in it that can clean jewelries or coins?

2007-08-19 07:04:41 · 2 answers · asked by Anonymous

is a nickle one of them

2007-08-19 06:38:24 · 3 answers · asked by K3ra B 2

2007-08-19 06:36:15 · 17 answers · asked by Alain M 2

both purine and pyrimidine bases are heterocyclic aliphatic ring structures - true or false?

sugars are good examples of molecules containing the amine group - true or false?

DNA, protein and ester formation always involve a condensation type of reaction - true or false?

in nucleic acids, carbon 4 of the pentose sugar is attatched to an organic nitrogenous base - true or false?

Amino acid monomers are the building blocks of polymeric DNA molecules - true or false?

Geometric (stereo) isomes exist in both cis and trans form - true or false?

All aliphatic hydrocarbons are based on the benzene molecule - true or false?

2007-08-19 06:21:30 · 1 answers · asked by Anonymous

Plz help me !!
Add 5 drops of propan-2-ol to 10 drops of sulphuric acid. Now add 2 drops of potassium dichromate solution and warm.
1.Note the smell and the color changes
2.Which reactant is oxidised in this reaction?
3.Name the organic compound formed and what homologous series does it belong to?
4.What would be the result if 2-methyl-propan-2-ol was reacted with acidified potassium dichromate ?
5.What other oxidising agents could be used for this reaction?
6.Oxidation of an alcohol produced 2-methylpropanoic acid. Name this alcohol

A lot of thanks plz help >.< !!!

2007-08-19 06:17:34 · 2 answers · asked by Yellow Flash 1

Oxidation to carbonyl compounds and carboxylic acids:

Add 5 drops of ethanol to 10 drops of sulphuric acid. Now add 2 drops of potassium dichromate solution and warm
1. What' is the smell and color changes ?
2.The reason for the color change?
3.Why is sulphuric acid added to the reaction mixture?
4.State the oxdising agent and the final product of oxidation

Any help would be thankful ^^

2007-08-19 06:08:10 · 1 answers · asked by Ice Ice 1

2007-08-19 05:45:57 · 4 answers · asked by Anonymous

2007-08-19 04:40:58 · 7 answers · asked by Prackash 1

For a solution to be isotonic 0.9%NaCl (Inside red blood cell), the osmolarity should be 0.308mol/L (same with RBC.) But, 0.3M Glucose has an osmolarity of 0.3mol/L, and is close to 0.9% NaCl's osmolarity...should 0.3M Glucose be considered isotonic or hypertonic?

2007-08-19 03:42:26 · 3 answers · asked by Jed Stephen 3

This can be very common question. But it is really important for us to know which is good for our health.

2007-08-19 03:21:44 · 11 answers · asked by Nasir 2

Is methane a radical?
Is it found in the periodic table?
What is the molecule formula for methane?

2007-08-19 01:09:42 · 16 answers · asked by Booyah! 3

when ammonium chloride powder was added to solution T, ammonium gas evolved.

2007-08-19 00:34:45 · 2 answers · asked by Hi T 1

This is part of my chemistry homework. Pls tell me how with details included and also explain any 'difficlut' chemistry lingo used. thx

2007-08-19 00:03:22 · 2 answers · asked by Naraku . 2

This is part of my chemistry homework. Pls tell me how with details included and also explain any 'difficlut' chemistry lingo used. thx

2007-08-19 00:02:06 · 5 answers · asked by Naraku . 2

2007-08-19 00:01:36 · 3 answers · asked by abdul r 1

2007-08-18 23:46:17 · 3 answers · asked by pinkcap 2

2007-08-18 22:42:01 · 7 answers · asked by razham1979 1

Cu(NO3)2 + NaOH -----> ?
Fe(NO3)2 + NaOH -----> ?
Cu(NO3)2 + NH3 ------> ?
Fe(NO3)2 + NH3 ------> ?

2007-08-18 22:41:30 · 0 answers · asked by Mr S 2

Which sulphide contains the greatest mass of sulphur in a 10g sample? Show all WORKINGS clearly.

A---Formula (NiS)---Mass of 1 mole is 90g.
B---Formula (CuS)--- Mass of 1 mole is 96g.
C---Formula (FeS2)--- Mass of 1 mole is 120g.
D---Formula (MoS2)--- Mass of 1 mole is 160g.

Many told me the answer is A. But I think the answer is C. Please answer only if you are 100% sure. Thank you.

2007-08-18 22:08:25 · 6 answers · asked by Maria 2

2007-08-18 22:06:40 · 2 answers · asked by yanna 1

why are first bubbles allowed to escape
when collecting h2 gas
please help!!

2007-08-18 20:00:36 · 2 answers · asked by benj p. 1

The solubilty of silver carbonate (Ag2CO3) is 0.32M at 20C.

2007-08-18 19:00:33 · 1 answers · asked by Anonymous

2007-08-18 18:25:58 · 2 answers · asked by teresa 1

2007-08-18 18:04:01 · 2 answers · asked by Gideon 1