Chemistry - October 2006

A mixture of KCl and KBr weighing 3.595 g is heated with chlorine, which converts the mixture completely to potassium chloride. The total mass of potassium chloride after this reaction is 3.129 g. What percentage of the original mixture is KBr?

(I was told the answer to the above question is 34.8%, but I am still unsure how this number was calculated. Could someone please walk me through the steps on how to arrive at this answer? Thank you!)

2006-10-25 09:15:42 · 1 answers · asked by whabtbob 6

2006-10-25 09:13:43 · 1 answers · asked by Anonymous

Ok, can someone please tell me what the specific heat capacity is for water...
I know I can look up in the internet but my net is messed up at the moment...
Anyways can you give me it in kj/kg AND j/g ? Thanks a lot

2006-10-25 08:57:55 · 9 answers · asked by A 2

on a label it reads.....

contains 61% w/w ethyl alcohol


can someone explain that to me please?

2006-10-25 08:53:09 · 5 answers · asked by makavelli405 1

PbCl2 + K2CrO4 >>> KCl ____________

2006-10-25 07:31:12 · 3 answers · asked by Anonymous

2006-10-25 07:15:23 · 3 answers · asked by kunal c 1

chemistry question

2006-10-25 06:55:55 · 4 answers · asked by terminator_3000 1

2006-10-25 05:52:40 · 7 answers · asked by Anonymous

Please tell me what these turn into
Double replacement Reactions:
NaCl + AgNO3 turned into a solid
Na2CO3 + HCl fizzed
NH4Cl + NaOH ammonia present
BaCl2 + Na2SO4 milky appearance (turned into a solid)
Na2CO3 + H2SO4 precipitated
NaOH + FeSO4 Immediately turned brown

Single Replacement Reactions:
H2O + Ca Produced gas
HCl + Al completely disolved in 5 minutes
HCl + Zn produced gas
HCl + Cu solution turned very light yellow
CuCl2 + Zn turned black on edges and precipitated
AgNO3 + Cu flaking apart, oxidizing, corroding

Can you please balance these and let me know how YOU know what they turned into? Im lost with these equations. Thanks so much. Angel

2006-10-25 05:43:30 · 4 answers · asked by Angel Eve 6

I understand that this occurs but not why (particularly why it increases down a group).

2006-10-25 05:33:42 · 4 answers · asked by Anonymous

2006-10-25 04:27:33 · 2 answers · asked by Bebe 1

2006-10-25 03:43:09 · 11 answers · asked by Anonymous

aTOMS OF THIIS ELEMENT WILL BE OXIDIZED BY Al3+ IONS

2006-10-25 03:40:21 · 3 answers · asked by chingchang 1

Could you please tell me the Mass numbers of Barium, Krypton,Lanthanum, Molybdenum? I coul'nt find the information on the Periodic table. Please Help...

2006-10-25 03:26:44 · 7 answers · asked by Vatsala says जय श्री कृष्णा ! 4

2006-10-25 03:03:49 · 2 answers · asked by zack l 1

2006-10-25 03:00:59 · 8 answers · asked by Anonymous

A 37.7mL volume of an unknown gas is collected over water at 19 degrees C and a total pressure of 770 torr. The mass of the gas is 68.6mg.

2006-10-25 02:54:29 · 4 answers · asked by sarah jean 1

2006-10-25 02:51:20 · 5 answers · asked by Anonymous

My son wants to do his science fair project on the effect of different carbonated and non-carbonated beverages on bone density, as represented by some form of calcium. Pure calcium metal won't work and we don't want to use Tums. Calcium Hydroxyapatite would probably be the best, since that's the form calcium takes in the human body. But I only see it available in pill form. Is there a way to get bigger portions of it to make the tests easier, or is there some other form of Calcium that would work better?

2006-10-25 02:36:41 · 3 answers · asked by peteckart 1

2006-10-25 02:12:12 · 5 answers · asked by reginal b 1

AS chemistry homework help

2006-10-25 00:51:02 · 8 answers · asked by Holly J 1

2006-10-25 00:44:01 · 3 answers · asked by Raju 1

Consider a small dia. wind mill turning a 12 volt dynamo or alternator producing 12volt DC feeding an electrolytic cell to produce hydrogen and oxygen. The oxygen would be allowed to vent to atmosphere. Could the hydrogen be piped to a reaction vessel and be induced to react with carbon dioxide. If my 50yo Chemistry A level is correctly remembered.
6H2 +4CO2 =2C2H5(OH) +3O2
Whilst this balances, I don’t know is if such a reaction is possible and if it is, what conditions and catalysts are required to produce it. It may require large scale units and high pressures/temperatures to react. It may require copious amounts of energy which renders the whole exercise fruitless.
The carbon dioxide could be the product of fermentation of organic matter so the process would be carbon neutral and renewable.
I would like to hope that it could be designed so there would be very little free hydrogen within the reaction vessel to cause hazard.
Could it be possible to produce the bigger chain al

2006-10-25 00:26:43 · 8 answers · asked by Paul G 1

2006-10-25 00:14:12 · 9 answers · asked by Ramie H 1

2006-10-25 00:02:57 · 7 answers · asked by MN S 1

its a term in biochemistry and I can't find any dictionaries that have this word.

2006-10-24 23:12:01 · 4 answers · asked by Maria P 1

how do you account for this?

2006-10-24 22:01:50 · 4 answers · asked by sakura 1

Could you explain about sp3 hybridization and sp3 like hybridization in cyrstllography? What is their main difference?

ZW

2006-10-24 21:08:44 · 2 answers · asked by zaw 1

1. What is shielding?

2. Explain how shielding contributes to the atomic radius trend within a group.

2006-10-24 20:57:04 · 1 answers · asked by I am myself 1

2006-10-24 19:46:12 · 5 answers · asked by Anonymous