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Author Topic: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions  (Read 40874 times)  Share 

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Mao

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2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« on: June 10, 2009, 02:13:12 pm »
That was a bitch of an exam.. :(

Let me know if I made any errors.

Congratulations to all :) you are FREE (for now..)


Errata:

Multiple Choice

MCQ 19 - B is technically correct

Short Answers

Question 3 (c)
If HCl was in the burette: Lower concentration of HCl, fixed number of moles of NaOH (in the aliquot) --> titre is greater. Hence calculated value will be higher than true.
If NaOH was in the burette: less number of moles of HCl (in the aliquot) --> titre is less. Hence calculated concentration of NaOH in the burette will be higher than true.
[I think either explanations will be fine]

Question 7, (a)
Step 1 is also correct, CO2 -> C6H12O6 is reduction +4 -> 0
« Last Edit: June 10, 2009, 05:47:56 pm by Mao »
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ilovevce

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #1 on: June 10, 2009, 02:17:41 pm »
Mao, so dedicated! Don't you have exams of your own...
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MHS 2008
Japanese SL (2007): 41 > 48.58    English: 50   Chem: 47 > 48.88    Physics: 49 > 49.58   Methods: 47 > 48.91   French: 45 > 52.06
ENTER: 99.95 :D

Tutoring in English, MM, Chem, Physics
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Toothpaste

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #2 on: June 10, 2009, 02:19:44 pm »
Mao don't tell me you're writing solutions to all the Monash University exams too ...
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doboman

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #3 on: June 10, 2009, 02:30:19 pm »
Quote from: Toothpick on June 10, 2009, 02:19:44 pm
Mao don't tell me you're writing solutions to all the Monash University exams too ...

Funny how we 2008'ers open this thread and are impressed with the amount of dedication Mao has. Whereas the 2009'ers are like "OMG OMG ANSWERS" :)
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"Acknowledge Him in all your ways, and He will direct your paths"

monokekie

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #4 on: June 10, 2009, 02:34:27 pm »
i am not sure about multiple choice quesiton 5 and 6
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monokekie

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #5 on: June 10, 2009, 02:34:47 pm »
ROFL

OMGOMG ANSWERS!!!



THANKS MAO
« Last Edit: June 10, 2009, 02:41:06 pm by monokekie »
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vamsiaus

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #6 on: June 10, 2009, 02:42:37 pm »
what is the whole exam out of?
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English, Maths Methods, Specialist Maths, Physics, Chemistry

monokekie

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #7 on: June 10, 2009, 02:43:10 pm »
57?
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ilovevce

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #8 on: June 10, 2009, 02:43:31 pm »
Quote from: monokekie on June 10, 2009, 02:34:27 pm
i am not sure about multiple choice quesiton 5 and 6

In Q5, molecule A is the most non-polar (it contains only a straight alkane chain) whereas the others have polar functional groups such as NH2 and OH. These polar groups would bond more to the polar mobile phase and so would travel through the chromatograph quicker. Option A would bond more to the stationary phase and so would be retained for longer.

In Q6, W,X,Y,Z are all straight chain alkanes. The only form of intermolecular forces they have are dispersion forces. If the boiling point is greater, the longer the alkane chain, and so the more dispersion forces would arise between the alkane and the stationary phase. So a greater retention time means a greater boiling point.
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MHS 2008
Japanese SL (2007): 41 > 48.58    English: 50   Chem: 47 > 48.88    Physics: 49 > 49.58   Methods: 47 > 48.91   French: 45 > 52.06
ENTER: 99.95 :D

Tutoring in English, MM, Chem, Physics
Places available for Unit 4

methodsboy

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #9 on: June 10, 2009, 02:44:02 pm »
73 - btw, I STUFFED UP REAL BAD I DIDNT GET TO CHECK MY ANSWERS!!!!
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vamsiaus

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #10 on: June 10, 2009, 02:44:11 pm »
are u sure coz last years was 78
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2008:
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English, Maths Methods, Specialist Maths, Physics, Chemistry

Toothpaste

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #11 on: June 10, 2009, 02:44:38 pm »
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monokekie

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #12 on: June 10, 2009, 02:45:16 pm »
ROFL at my memory, yeah it was 73 i guess?
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hard

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #13 on: June 10, 2009, 02:51:01 pm »
i'll be lucky for a 10
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mystikal

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Re: 2009 Chemistry Unit 3 Exam Questions and Suggested Solutions
« Reply #14 on: June 10, 2009, 02:51:14 pm »
it felt more than 73
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