Qualification > Sciences

Chemistry AS Multi Choice Help

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lonelyboy:
Best of luck guys! Kill it.


 :D

MaNi_DaDuDe:

Does anyone know the uses of certain chemical compounds?

They asked something about a bromo-halogenoalkane which was used as a fire extuingisher or something in May/June.

vince_24:
Heres the PDF Version of what MaNi posted. A lot of chemistry multi choice questions, etc. Very helpful

http://www.megaupload.com/?d=7CBYEBYX

Enjoy.

MaNi_DaDuDe:

--- Quote from: vince_24 on November 18, 2009, 11:24:54 pm ---Heres the PDF Version of what MaNi posted. A lot of chemistry multi choice questions, etc. Very helpful

http://www.megaupload.com/?d=7CBYEBYX

Enjoy.

--- End quote ---

Thanks a lot bro. :)

+rep'd.

happy angel:
Use of the Data Booklet is relevant to this question.

Ethyl ethanoate can be obtained from ethanoic acid and ethanol by the following reaction.

CH3CH2OH + CH3CO2H--> CH3CO2CH2CH3 + H2O

Ethanol (30 g) and ethanoic acid (30 g) are heated under reflux together, and 22 g of ethyl
ethanoate are obtained.

What is the yield of the ester?
A 25 % B 38 % C 50 % D 77 %

the answer is C.. how???

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