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BoS trials Maths and Chemistry 2020 (2 Viewers)

turtle67

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Just some hints:

E is a tertiary alcohol (2-methylbutan-2-ol) as it is not oxidising by the oxidising agent

C is 2-bromo-2-methylbutane as it makes E through a substitution

A is an alkene. It is 2-methylbut-1-ene. It must be the but-1-ene bit because it needs to make a primary alcohol to make the carboxylic acid in compound F

B is 1-bromo-2-methylbutane. Other isomer of the addition reaction of HBr

D is 2-methylbutan-1-ol

F is a carboxylic acid

G is a sodium salt

H and I are made because it can react two ways either alcohol + carboxylic acid = ester

or amine + carboxylic acid = amine
this year 12 chemistry looks like a bit of a step up from year 11 lol
 

pikachu975

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this year 12 chemistry looks like a bit of a step up from year 11 lol
Yeah haha also keep in mind the BOS trials are usually harder than the HSC if you want to challenge yourself! They're worth a try to improve problem solving skills and to see where you're at ^^
 

Trebla

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We should be in a position to release solutions and results for Maths Ext2 in the next 2-3 days. In the meantime, if there are any specific questions you want an outlined solution for, just ask and I can reply.
 
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Trebla

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Since multiple people keep asking, the Chemistry paper is located on page 2 of this thread
 

YonOra

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Hi.

Are you able to provide me with the answers to Q13 b) i) for the Maths Ext 1 BoS 2020 Trials paper please? Thank you!

P.S. hats off to you for this Q. I have never been stumped by an Induction question. Really, really made me think.
 

Trebla

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Hi.

Are you able to provide me with the answers to Q13 b) i) for the Maths Ext 1 BoS 2020 Trials paper please? Thank you!

P.S. hats off to you for this Q. I have never been stumped by an Induction question. Really, really made me think.
Will just outline it here, because it is quite long to type in full.

You need to prove



Use the definition of



But



and



Hence



You can then apply the assumption to get the final answer.
 

YonOra

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Will just outline it here, because it is quite long to type in full.

You need to prove



Use the definition of



But



and



Hence



You can then apply the assumption to get the final answer.
How did you get the definition of (
 

Trebla

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hiii roughly when will the chem answers be uploaded?
Sorry, there is a bit of a backlog in getting Maths out before Chemistry as the Maths HSC exams start on Monday and the Chemistry HSC is still a while away. If you have any specific questions you want to know the answer to, just post it here.
 

KingSabi6

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Sorry, there is a bit of a backlog in getting Maths out before Chemistry as the Maths HSC exams start on Monday and the Chemistry HSC is still a while away. If you have any specific questions you want to know the answer to, just post it here.
when will the math solutions be uploaded considering the exams are in a few days?
 

Trebla

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💥

Here are the solutions and student results for the 2020 Mathematics Extension 2 BoS trials. Thanks to everyone who participated and for your patience!

A reminder that whilst the questions are made to be as closely styled to the HSC exams as possible, this is NOT intended to be an accurate reflection of the difficulty of the HSC exam. So don't get too hung up on the mark you got. It is designed to give you good practice in exercising your problem solving skills in preparation for those harder questions in the exam.

Please note that the question paper has also been updated (in the same post I originally posted it) to include further minor edits to wordings and typos. If you find any typos in the solutions, please flag that for our consideration.

Best of luck for the HSC exam on Monday!
 

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Drdusk

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Aye good job to the person who got 72! Well done to everyone else as well.

Seems question 16 destroyed everyone this year.
 

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