Chemistry - November 2006

a compound has been isolated that can have either of two possible formulas:(a)k[fe(C2O4)2)(H2O)2 ]or (b)k3[fe(C2O4)3]. to fine which is correct,you dissolve a weighed sample of the compound in acid and then titratethe oxalate ion(C2O4 -2) that comes from the compound with potassium permanganate,kMnO4.the balanced net ionic equation for the titration
5C2O4-2+2MnO-4+16H+ gives 2Mn+2 +10CO2+8H2O

tyitration of 1.356 g of the compund requires 34.50ml of 0.108 M KMnO4.

2006-11-05 07:51:31 · 2 answers · asked by reem h 2

2006-11-05 07:37:26 · 1 answers · asked by Anonymous

2Mg + O2 -> 2MgO

What im asking is.. does Mg react with the atmosphere?

2006-11-05 07:32:17 · 1 answers · asked by shaady r 1

I just need the general idea for this problem. No need for numbers.. I just want the general formula. :) thanks

2006-11-05 07:30:11 · 1 answers · asked by KTIZZLE 1

hello. i need help please with homework regarding addition to alkenes. anyone, please be so kind as to check my answers. my answers and links to the homework follow:

page 1:
http://img.villagephotos.com/p/2006-10/1223233/ochemhw8p1.JPG

page 2:
http://img.villagephotos.com/p/2006-10/1223233/ochemhw8p2.JPG

My answers:
1-B
2-B
3-A
4-A
5-A
6-A
7-B
8-A
9-D

2006-11-05 07:28:31 · 2 answers · asked by pilatesfreak 2

=)

2006-11-05 07:18:12 · 3 answers · asked by LOVE♥ 1

2006-11-05 07:16:24 · 4 answers · asked by swimmertommy 1

that contains potassium hydrogen carbonate as well as sodium hydrogen carbonate, how would you determine the mass percentage of each hydrogen carbonate in the sample?

2006-11-05 07:12:22 · 1 answers · asked by Anonymous

2006-11-05 06:56:24 · 1 answers · asked by Anonymous

can you explain this in terms of density and volume of air? thanks!!

2006-11-05 06:56:22 · 8 answers · asked by Drea 1

2006-11-05 06:51:39 · 6 answers · asked by D M 1

BaOH
RMM: 137 + 16 + 1 = 154
moles = mass/rmm

2006-11-05 06:48:49 · 5 answers · asked by Joyce 4

2006-11-05 06:48:23 · 1 answers · asked by Meg 2

if you can an example with the answer would be helpful.
Thank you soo much!

2006-11-05 06:34:00 · 1 answers · asked by Anonymous

1)what volume of calcium chloride holds a pound of ammonia? (i really need a graph chart covering temprature /pressure)

2) does the electrical resistance of calcium chlride change as it becomes satureted with ammonia?

i really need some help with this....i have been unable to find any temp/pressure graph charts dealing with ammonia saturated calcium chloride. im in the process of trying to build a solar powered air conditioner with a bank of generator/absorber cells,an air cooled tower condensor, a large liquid ammonia reciever, an ammonia evaporator/glycol heat exchanger, and finally a gravity fed glycol/room ait heat exchanger.

yes, i am fammiliar with the dangerous pressures that will be generated. i know that ammonia is nasty stuff, and i understand basic thermodynamics (i install and fix air conditioners for a living)

i just need help with the chemistry end of the thing.

with gratitude,
Possum

ps.....please feel free to IM or email me (in my bio)

2006-11-05 06:27:15 · 2 answers · asked by hillbilly named Possum 5

1. hydrogen bomb explosion
2. atomic bomb explosion
3. Nuclear Fussion reactor
4. Nuclear Fission reactor
5. All of the above convert some matter to energy

2006-11-05 06:20:54 · 3 answers · asked by reejabhattarai 1

2006-11-05 06:16:09 · 2 answers · asked by csnape2003 3

so we did this experiment in chem and there were two basic solutions:
-cations combined with nitrate ions
-anions combined with sodium ions

why were they combined like that? why can't the cations be combined with the sodium ions???

PLEASE HELP!!!!
thanks

2006-11-05 06:11:21 · 3 answers · asked by Anonymous

2006-11-05 05:50:44 · 2 answers · asked by Anonymous

2006-11-05 05:37:55 · 1 answers · asked by avigail 2

What are signs of ghosts? ive been seeing hearing and experiencing ghosts. I saw really wierd things happening. Ive also seen wierd green stuff everywhere and i think its ghost plasma. Last year a teacher in my school passed away. We think the ghost is her. What should i do?

2006-11-05 05:13:14 · 6 answers · asked by Anonymous

and why has benzene used in this case?

2006-11-05 05:03:09 · 2 answers · asked by mask 1

huckel's rule applies to aromatic & antiaromatic compounds, but the compound is nonaromatic when its not planar. how do i know if it's planar just by looking at it? what about ions?

2006-11-05 04:56:09 · 2 answers · asked by buffy t 1

Only the absorbance is known (as wel as l)

2006-11-05 04:17:48 · 1 answers · asked by nas_z 1

2006-11-05 03:58:52 · 5 answers · asked by Anonymous

What is the percent yield of PBI_2 if 5.00 grams of PBI_2 results from a solution containing 10.g of PB(C_2H_3O_2)_2 with a solution containing an excess of KI?

2006-11-05 03:46:18 · 1 answers · asked by Anonymous

2006-11-05 03:09:34 · 3 answers · asked by bright10vino 1

2006-11-05 02:45:38 · 3 answers · asked by Anonymous

2006-11-05 02:41:00 · 5 answers · asked by Anonymous

2006-11-05 02:34:23 · 3 answers · asked by kennethblatchford 1