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Chemistry: Post your doubts here!

S

student1415

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thank you
Thought blocker said:
28)
1 u know is right
2) when two ethane radicals combine
3) when combination of ethane radical is chlorinated

37)
Remember the termination step. Two free radicals join to form a molecule. Break this molecule CH3CHCl-CHClCH3 into this CH3*CHCl and *CHClCH3. These are two free radicals formed in the propagation step. Whenever these questions come. Break the central bond and check if two free radicals are formed.

39)
♣♠ Magnanimous ♣♠
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A

_Ahmad

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PLEASE can anyone explain these questions.

Q1,9,32,36,37 from
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w06_qp_1.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w06_ms_1.pdf

Q20,26,33,34,40 from
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s07_qp_1.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s07_ms_1.pdf
 
Last edited:
Thought blocker

Thought blocker

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Tulaib said:
Can anyone solve Q9?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s12_qp_11.pdf
Click to expand...
Easiest approach I would use is to do trial and error with the 4 options, which is fast after some practice.
Since B is the answer, I'll use it as example

2P --> 2Q+ R
2.........0 .....0 ..... initial
-2x ...... +2x .... +x ..change
2-2x..... 2x ..... x..... final

Refer to the steps below if you are not sure how the info in the above table is filled up.
1st step : write down info for the initial row
2nd step write down that R will be x moles as stated in question
3rd step: fill in the info in green
4th step: fill in the info in yellow
5th step: fill in the row for final
Check that the info in the final step adds up to 2 + x . ( 2 -2x + 2x + x )
 
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