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2013
Tue
12
Nov
Miss Loi avatar

Of The GCE O Level 2013 Chemistry 5072 MCQ Paper 1 Suggested Answers & Solutions

(23)
Tuition given in the topic of Science Tutors from the desk of Miss Loi at 3:03 pm (Singapore time)

… continued from here.

*SELF POWERS UP*


12 Nov 2013

Finished In Front Of The Toilet

Exhausted from helping to prepare multiple answers to multiple papers (gosh this year’s exam timetables are really MEH 🙁 ), I once again slumped against my chair at The Temple in front of what is possibly the most beautiful, most ammonia (NH₃) pungent smell-free toilet you’ll ever find in any tuition centre in Singapore 😛

Twin Temple Toilets

The Temple‘s twin toilet – obsessively cleaned of *ahem* “organic compounds” to ensure a pleasant stay

It’s been raining all morning, but thankfully the gloomy weather didn’t translate into doom and gloom in today’s O Level Chemistry MCQ paper.

The list of workings and explanations for each of the answers (where applicable) for the GCE O Level 2013 Chemistry Paper 1 MCQ have been compiled!

Latest versions:

  • 1.2: Added further explanations to:
    Q16 – Why Y is not oxidation due to unchanged oxidation state of elements in ethanoic acid.
    Q32 – Why nitrogen does not undergo a reaction in the blast furnace.
    Q36 – Note on cis-trans isomers *sigh*
  • 1.1: Q23 – corrected typo in explanation. Should be options A, B & C excluded.

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GCE O Level 2013 Chemistry 5072 Paper 1 solutions

2013 O-Level October/November Chemistry 5072 Paper 1 Suggested Solutions
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Do they tally with yours? As usual, please, please leave a comment should you spot any mistake in the solution.

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Comments & Reactions

23 Comments

  1. anonymous's Avatar
    anonymous commented in tuition class


    2013
    Nov
    12
    Tue
    3:39pm
     
    1

    For qn36 wikipedia answer is 4. For qn32 some people put nitrogen as well because of the high temperature. some people also put oxygen only.

  2. anonymous's Avatar
    anonymous commented in tuition class


    2013
    Nov
    12
    Tue
    4:03pm
     
    2

    Hi, for qn16 can it be y is oxidised as well, since the ethanoic acid lost hydrogen?

  3. Janice's Avatar
    Janice commented in tuition class


    2013
    Nov
    12
    Tue
    4:07pm
     
    3

    Hi, I would like to know that what's the minimum MCQ score that one has to get to achieve an A1, based on past years experience.

  4. a's Avatar
    a commented in tuition class


    2013
    Nov
    12
    Tue
    5:37pm
     
    4

    q16 should be Y and X. they asked for reaction that undergone oxidation, ethanoic acid + sodium. ethanoic acid loses one H. besides, Na increases its os from 0 to +1 to form the salt

  5. Anon's Avatar
    Anon commented in tuition class


    2013
    Nov
    12
    Tue
    5:46pm
     
    5

    For qn 16, there is a loss in hydrogen. Isn't that an oxidizing reaction?
    For qn 30, the experiment seems to be in an airtight condition so there cannot be presence of air right?

  6. Dan's Avatar
    Dan commented in tuition class


    2013
    Nov
    12
    Tue
    5:51pm
     
    6

    Hi isn't the answer for question 12 A, and not D? I believe water molecules stay as molecules but do not form ions in an aqueous salt solution? Unless you're referring to electrolysis which isn't in this case?

  7. yiling's Avatar
    yiling commented in tuition class


    2013
    Nov
    12
    Tue
    7:53pm
     
    7

    Hi, what do you think would be the minimum mark requirement for mcq to secure an A1?

  8. random's Avatar
    random commented in tuition class


    2013
    Nov
    12
    Tue
    8:02pm
     
    8

    random, just giving my 2 cents worth, IMO the cis - trans is not that important and cambridge should not ask for it as O levels only include structural but not spatial or geometric isomerism

  9. Teh's Avatar
    Teh commented in tuition class


    2013
    Nov
    13
    Wed
    10:16am
     
    9

    For qn32, they said gases that go in from the bottom of the blast furnace. Doesn't that mean only oxygen reacts because carbon dioxide is only obtained when oxygen travels up the blast furnace and reacts with the coke?

  10. Anon's Avatar
    Anon commented in tuition class


    2013
    Nov
    13
    Wed
    10:27am
     
    10

    For question 36, the 4 isomers can actually be deduced just by drawing out. It does not have to be in syllabus but rather based on present knowledge, can be deduced. Answer should be c.

  11. anony's Avatar
    anony commented in tuition class


    2013
    Nov
    14
    Thu
    4:44pm
     
    11

    Hi all, can you post your marks here? We can see the trend and difficulty level this time. I got 36.

  12. Pill's Avatar
    Pill commented in tuition class


    2013
    Nov
    14
    Thu
    9:30pm

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