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Tough chem p6 questions from 1990-1995-help plz!!

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angell:
Going through past papers from 1990 to 1995, I found these questions that i got a lil confused in. Appreciate it if someone could answer them plz?


1. A student heated some ethanol in a test tube. Write down two expected observations.


2. A general purpose cleaner is made up as follows:

Soluble substances                       % by mass
fomaing agent                                10
ammonia                                         5
bleaching agent          12
binding agent         10
detergent         19

Insolube substances               %by mass
Calcium carbonate                 44

Outline, with experimental details, how you would show that the cleaner contains 44% of insoluble material.

3. A farmer needs to test and compare the acidity of two samples of soil from different fields. Outline how the farmer should carry out these tests.

4. You are provided with samples of three metals: copper , zinc and magnesium. Outline an experiment that could be carried out to show their order of reactivity. Marks will be awarded for practical details and observations.

5. Four unlabelled bottles of chemicals each contained one of the following liquids:

Aqueous copper(II)sulphate
Pure water
Hexane(an alkene)
Limewater
State observations or tests by which you could correctly label each bottle.

angell:
Anybody??? :(

Naruto:
hey i have the answers from 1993 to 2008 on ward so can you tell me the year??????????

astarmathsandphysics:
Can you send them to me?

angell:
hey naruto....could u plz check cuz i have no idea now!! some of it is from 1991 too:(:(

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