Chemistry - March 2007

Ok, these are a few I'm having a lot of trouble with.

1. A solution of potassium permanganate is mixed with an alkaline solution of sodium sulfite.

I don't really understand what they mean by alkaline solution or what I would do with it even if I did, hah.

2. Acetic Acid is added to a solution of sodium hydrogen carbonate.

HC2H3O2 + NaHCO3 -> ???

3. Boron trifluoride and ammonia are mixed.

BF3 + NH3 -> ???

I tried looking this up and I got one answer that said they end up as BF3 + NH3 which makes no sense to me. Anyone know?

4. A piece of iron is added to a solution of Iron III Sulfate.

Fe + Fe2(SO4)3 -> ??

5. Solution of ammonia is added to solution of ferric hydroxide.

Any help at all is appreciated.

2007-03-27 16:55:32 · 1 answers · asked by fara.abdul 1

2007-03-27 16:29:14 · 4 answers · asked by Thejames A 1

Use the Ideal Gas Law equation to calculate the unknown quantity in the following measurement. The GFM is the molar mass of the substance.
Pressure = 0.65 Atm
Volume=4745.2 L
mass=12080 grams
GFM=?? g/mole
Temp.- 249 degrees Kelvin

If you understand this problem, please show me the formula that you used. I'm not sure how to set it up.
Thanks

2007-03-27 16:22:40 · 2 answers · asked by Bunny Slippers 1

hey guys so apparently theres music that can make u feel in a "high" state of mind, i was wondering if the manipulation and creation of soundwaves when listened to can cause harm? i kno this is a kind of underground topic and not many people will no about it but any1?? one such example is idoser if any1 has heard of it.

ive never tried it, but i think its a load of bs... but im bored so i might try it :) let me know thanks

2007-03-27 16:16:52 · 3 answers · asked by Anonymous

I have some muriatic acid, which is 30 per cent v/v HCl. What is a simple calculation to determine how much water to add to a particular volume of the muriatic acid to dilute it to other strengths? The calculation must be usable for any starting percentage and any desired percentage.

2007-03-27 16:10:34 · 3 answers · asked by David A 5

i need this a science project so answer quickly!!

2007-03-27 16:10:30 · 2 answers · asked by Adaline B 1

Using the millimolar absorptivity of PNPP, convert ΔA/min to mM/min (ie. rate of increase in concentration of PNPP) from the Beer-Lambert law.

500µL of 0.4mM PPNP
Linear Equation: y = 0.0007x + 0.0056
ΔA/s = 0.0007
ΔA/min = 0.0418

2007-03-27 16:09:55 · 2 answers · asked by Ashley 2

Hydrogen sulfide, H2S, is a foul-smelling gas. It burns to form sulfur dioxide.

2H2S(g) + 3O2(g) → 2SO2(g) + 2H2O(g) ∆H = −1037. kJ

Calculate the enthalpy change to burn 57.19 g of hydrogen sulfide.

___ kJ

2007-03-27 15:58:58 · 1 answers · asked by ssutter 1

2007-03-27 15:31:49 · 5 answers · asked by Anonymous

C2H5OH + 3 O2 > 2 CO2 + 3 H2O + 1570 kJ

Calculate the mass in grams of carbon dioxide that would be produced along with the release of 2.71x10^5 kJ.

Your help is greatly appreciated...

2007-03-27 15:21:25 · 3 answers · asked by Serenity 2

Which of the below statements a) through f) are true?


For statements a) through d) use the following reaction:


Cu(s) + 2Ag+(aq) --> 2Ag(s) + Cu2+(aq)

a) Cu is the reducing agent

b) Ag+ is the reducing agent

c) Cu is oxidized

d) Ag+ is oxidized





e) HCl(g) + NH3(g) --> NH4Cl(s) is a redox reaction

f) 2CuCl(aq) --> CuCl2(aq) + Cu(s) is a redox reaction

2007-03-27 15:15:32 · 3 answers · asked by wmartine 1

For statements a) through d) use the following reaction:


Cu(s) + 2Ag+(aq) --> 2Ag(s) + Cu2+(aq)

a) Cu is the reducing agent

b) Ag+ is the reducing agent

c) Cu is reduced

d) Ag+ is reduced





e) Zn(s) + 2HCl(aq) --> ZnCl2(aq) + H2(g) is a redox reaction

f) Cr2O72-(aq) + 2OH-(aq) --> 2CrO42-(aq) + H2O(l) is a redox reaction

2007-03-27 15:09:12 · 2 answers · asked by giggles9783 1

When aluminum is heated with an excess of bromine, aluminum is formed. In a given experiment, 6.00 grams of aluminum is heated with an excess of bromine to yield 50.3 grams of aluminum bromide. Calculate the percent yield for this experiment.

Thanks in advance...

2007-03-27 15:07:36 · 1 answers · asked by Serenity 2

2007-03-27 14:59:11 · 4 answers · asked by MegGC 1

How do we calculate the maginification of a low power, medium power, high power for a microscope? I have a test tommorow and the only thing I don't know is this. Is there any site for this?


Thanks for any advice.

2007-03-27 14:42:54 · 1 answers · asked by Anonymous

A pure substance is something that cannot be further broken. But water CAN be broken down into hydrogen and oxygen. Help???

2007-03-27 14:42:11 · 4 answers · asked by play_festivity 4

for example if you have
Hydrochloric acid added to sodium carbonate. it becomes
(H+) + (CO3 2-) arrow
CO2 + H2O

Why is sodium and chloride spectator ions?

2007-03-27 14:26:15 · 1 answers · asked by avalentin911 2

3. [1pt]


Balance the following equation by the half-reaction method in an acidic or basic solution as indicated.


OCl - + Cr(OH)4- --> CrO42- + Cl - ( basic )


You must enter the correct coefficients of the above reactants and products as a single group of integers.


Example:

C2H5OH(aq) + Cr2O72-(aq) --> CH3CO2H(aq) + Cr3+(aq)


the balanced equation is

3C2H5OH(aq) + 2Cr2O72-(aq) + 16H3O+(aq) --> 3CH3CO2H(aq) + 4Cr3+(aq) + 27H2O(l)

2007-03-27 14:11:39 · 3 answers · asked by sam 2

I have always been told that plastic is a product of petroleum! How in the heck does oil become the solid plastic used in everything?

2007-03-27 14:06:37 · 3 answers · asked by Anonymous

Also,
You might see an emission spectra if you looked at a spectra of, what?

You might see an continuous spectra if you looked at a spectra of, what?

2007-03-27 14:06:07 · 3 answers · asked by Ryoma Echizen 3

2007-03-27 14:05:25 · 1 answers · asked by truckin_90 2

A) Iron (III)
B) Mercury (II)
C) Nitride
D) hydrogen carbonate
E) Oxide
F) permanganate
PLEASE HELP ME!!

2007-03-27 14:02:42 · 1 answers · asked by truckin_90 2

is there any liguid that smokes alot at fairly low tempetures?what easyly accessible liquids can smoke.i know oil does but i couldnt get it to.is there a certain type i should use?

2007-03-27 14:00:01 · 3 answers · asked by grizzlymountainman33 1

-write the electron configuration of a arsenic atom.
-Calculate the total # of electrons in each energy level
-State which which evergy levels are not full.
PLEASE HELP ME!

2007-03-27 13:59:59 · 1 answers · asked by truckin_90 2

A buffer consisting of H2PO4^- and HPO4^2-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 6.5g of NaH2PO4 and 8.0g of Na2HPO4 per 355 mL of solution.

2007-03-27 13:58:00 · 2 answers · asked by pinkpanthergirl 1

2007-03-27 13:55:51 · 2 answers · asked by ? 1

Why do you think that? :)

2007-03-27 13:53:55 · 1 answers · asked by Tracey Lee ♥ 2

A buffer is prepared by adding 5.0g of ammonia (NH3) and 20.0g of ammonium chloride (NH4Cl) to enough water to form 2.50L of solution.

a) what is the pH of this buffer?

b) write the complete ionic equation for the reaction that occurs when a few drops of nitric acid are added to buffer.

c) write complete ionic equation for the reaction that occurs when a few drops of potassium hydroxide solution are added to the buffer.

2007-03-27 13:50:10 · 2 answers · asked by pinkpanthergirl 1

Is there any way to control fire by using a suit that you cn wear?

2007-03-27 13:46:05 · 1 answers · asked by encikus 2

Explain why a mixture formed by mixing 100 mL of 0.100 M HC2H3O2 and 50 mL of 0.100 M NaOH will act as a buffer?

2007-03-27 13:42:48 · 1 answers · asked by pinkpanthergirl 1