BoS trials Maths and Chemistry 2020 (2 Viewers)

[OnJob]

It's like 12 posts up....

Yeah sorry I couldn't find it because my site wouldn't show the "newer" posts. Thanks though!

 

[turtle67]

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

 

[BlueGirl18]

Hi! Just wondering if the solutions will be uploaded soon? Many thanks!!

 

[MrGresh]

this year 12 chemistry looks like a bit of a step up from year 11 lol

Haha yep. The stuff in that question is organic chemistry, which looks a lot more confusing than it is!

Year 12 chem is pretty complex but also super rewarding, so enjoy it!

 

[turtle67]

Haha yep. The stuff in that question is organic chemistry, which looks a lot more confusing than it is!

Year 12 chem is pretty complex but also super rewarding, so enjoy it!

I'll try my best to enjoy it ahah, good luck in your exams

 

[pikachu975]

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]

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.

 

[Trebla]

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

BoS trials Maths and Chemistry 2020

Pending someone giving that, feel free to name a handful of specific questions you want to know the answer to and we can provide a brief outline of the solution. Just a question, are people able to get their own papers which are marked back?

www.boredofstudies.org

 

[YonOra]

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]

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]

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 (

 

[YonOra]

How did you get the definition of (

And (from what i can see from that definition) you can't use the roots and coefficient rules?

 

[ikindawannasleep]

Pending someone giving that, feel free to name a handful of specific questions you want to know the answer to and we can provide a brief outline of the solution.

hiii roughly when will the chem answers be uploaded?

 

[Trebla]

How did you get the definition of (

Use this on the RHS of what you are trying to prove

And (from what i can see from that definition) you can't use the roots and coefficient rules?

Note that and are the roots of the equation

 

[Trebla]

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]

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]

when will the math solutions be uploaded considering the exams are in a few days?

Maths Ext2 results and solutions will be released tonight...

 

[Trebla]

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!

 

[Drdusk]

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

Seems question 16 destroyed everyone this year.

 

[2xq]

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

Seems question 16 destroyed everyone this year.

seemed like the marker had a great time marking q16!!! ;D