Chemistry - April 2007

2007-04-04 03:02:34 · 4 answers · asked by Peter M 1

If so, please tell me what is currently being done to address these concerns.

2007-04-04 03:00:06 · 5 answers · asked by Shing Y 2

2007-04-04 02:59:20 · 1 answers · asked by Peter M 1

I understand the different components that make up the blood buffer system, but this question is restricted to the HCO3- ion that is present. The question is this:

Is HCO3-/H2CO3 buffer system more effective against the addition of acid or the addition of base.

This question can probably be answered without considering the blood buffer system, but this is how the question was presented. On a further note, I answered the question, was correct with my answer, but I want to see if I was correct with the explanation I gave as to why my answer is what it is. If anyone can give me some information on this, I would really appreciate it. Thanks!

2007-04-04 02:26:38 · 2 answers · asked by Anonymous

a)C2H6O+CO3^2-==>HCO3^1-+C2H5O^1- b)HNO3H2o==>H3O^1++NO31- c)HCl+KOH==>KCl+H2O

2007-04-04 02:09:17 · 3 answers · asked by Anonymous

2007-04-04 01:35:29 · 4 answers · asked by networking girl 3

Two parts to this question...I'm not sure of the way to achieve this!
How do I gently but quickly remove
i) organic solvent from solution
ii) water from solution ?

Any answers received quickly Much appreciated! :)

2007-04-04 01:15:10 · 2 answers · asked by Anonymous

Would this be right to distinguish a solution of ammonia from water?

Add Iron (III) Chloride

Ammonia solution: NH4OH + FeCl3 -> Fe(OH)3 + NH4Cl
brown precipiate formed.

Water: no reaction

Also, does a "solution of ammonia" definetely have chemical formula NH4OH

2007-04-04 01:11:22 · 2 answers · asked by Anonymous

2007-04-04 00:23:12 · 1 answers · asked by Gideon 1

2007-04-04 00:23:00 · 1 answers · asked by TJgsxr 1

2007-04-04 00:05:55 · 2 answers · asked by networking girl 3

I said to add Copper (II) oxide to both and whichever one gives off the aromatic gas, is the solution of ammonia.

NH4OH(aq) + CuO(aq) -> Cu(OH)2(s) + NH3(g)
Blue precipiate formed. Aromatic Gas evolves.

H20(l) + CuO(aq) -> Cu(OH)2(s)
Blue precipitate forms.

Is this right? Are there any better chemical tests to distinguish between the two?

2007-04-03 23:59:10 · 5 answers · asked by Anonymous

I have a test coming up and need help figuring out some review questions!!

*CO gas diffuses through a barrier @ a rate of .280mL/min. If an unknown gas diffuses through the same barrier @ a rate of .277mL/min, what is the molar mass of the gas?

*Excited H atoms emit light in the ultraviolet at 2.47x10^15 Hz. what is the energy of a single photon w/ this freq?

*The energy required to break 1 mole of Cl-Cl bonds in Cl2 is 242kJ/mol. What is the longest wavelength of light capable of breaking a single Cl-Cl bond?

*What is the de Broglie wavelength of a 120g golf ball traveling @ 65km/hr?


THANK YOU SOOOO MUCH!

2007-04-03 22:02:32 · 3 answers · asked by Jay 2

If a 3.44-L flask of SO2 at 1.65atm contains the same number of molecules as a 5.00-L flask of H2 at -7 C and 1.00 atm, what is the temp in celsius of SO2?

I know the answer is 29, but i cant figure out how to get there. I know I'll kick myself once I see how its worked.

Thank you!!

2007-04-03 21:04:47 · 1 answers · asked by Jay 2

1 oz of 80% pure (NH4)2SO4, 1 gallon of water @ 25 degrees Celsius.
1 gallon = 3.785 L, 1 oz = 28.4 grams.

Suppose an avid gardener prepares a solution by putting 1 oz of 80% pure Ammonium Sulfate in a gallon of water at 25 degrees C.
a) what is concentration of HSO4 and NH3 in solution at equlibrium.
b) suppose you want to make sure pH is at 7.0. If you have pure NH3 and H2SO4 at hand, how many grams (of which one) would you have to add?

[b]2. Relevant equations[/b]
(NH4)2SO4 dissolves in water to form 2NH4+ and SO4(2-)

NH4 + H2O => H3O + NH3
SO4 + H2O => OH + HSO4

[b]3. The attempt at a solution[/b]
i already finished part a by first changing oz and gallons into moles/L => Molarity. then i calculated equilibrium amounts by initial, change, end calculations.

my main problem lies in (b) as i have no clue how to approach this problem. can someone help?

2007-04-03 20:00:57 · 2 answers · asked by omghahahahahaharandom 2

Carbon dioxide
fats
proteins
H2O
DNA
Oxygen
KC1
Glucose

2007-04-03 19:31:32 · 5 answers · asked by jacah5 3

2 H2O(l) O2(g) + 4 H+(aq) + 4e-

If 0.072 L of O2 is collected at 25°C and 717 mmHg, how many faradays of electricity had to pass through the solution?

2007-04-03 17:40:51 · 1 answers · asked by mitch v 1

Any answers?

2007-04-03 17:34:58 · 1 answers · asked by ~SMCM101~NYC 2

2007-04-03 17:17:14 · 6 answers · asked by mishela s 1

Which of these is soluble in water? ethanol?

1. calcium chloride
2. citric acid
3. lauric acid
4. potassium iodide
5. sodium chloride
6. sucrose

2007-04-03 17:11:17 · 1 answers · asked by -__ 3

1. 0.001M HCL
2. 0.00001 HCL
3. 1.0x 10^-12 M HCL

2007-04-03 16:55:36 · 2 answers · asked by stacie b 2

K2SO4(aq) + BaCl2(aq) =

KOH(aq) + HBr(aq) =

AgNO3(aq) + CaCl2(aq) =

2007-04-03 16:53:30 · 2 answers · asked by dummy 1

1. H2SO4(aq) + 2NaOH(aq)
2. 2H3PO4(aq) + 3Mg(OH)2 (aq)
3. H2CrO4(aq) + 2KOH (aq)
4. Al(OH)3 (aq) + 3HCLO4 (aq)
5. 2NaOH(aq) + H2CO3


Please tell me how u got the answers too!!! I need to learn how to do them as well.

2007-04-03 16:52:51 · 2 answers · asked by stacie b 2

2007-04-03 16:52:28 · 5 answers · asked by Anonymous

2007-04-03 16:51:58 · 2 answers · asked by Anonymous

I have to group the following elemets into 2 groups. How and why would they go into each group?

1. calcium chloride
2. citric acid
3. lauric acid
4. potassium iodide
5. sodium chloride
6. sucrose

2007-04-03 16:49:14 · 2 answers · asked by -__ 3

What does potassium iodide and ammonium hydroxide yield?

2007-04-03 16:46:15 · 3 answers · asked by Me + Me = BANG! 2

I think that I have about 50 mL of HCl and I need to know how much CaCo3 is needed to neutralize the HCl perferably in grams or moles. Thanks!

2007-04-03 16:40:01 · 4 answers · asked by Anonymous

studying

2007-04-03 16:39:22 · 2 answers · asked by Chicago 4

A. increases with the addition of a catalyst.
B. decreases with a decrease in temperature.
C. increases if the solution is stirred vigorously.
D. does not change with an increase in temperature.

2007-04-03 16:36:45 · 2 answers · asked by shevchenko 1