HSC Chemistry 2017

[kauac]

Just wondering, a lot of friends saying that they got a lot of Ds, and I got a lot of As as I didn't have time to do, just randomly chose.
Did all of you got a lot of Ds? 

Hey...For the first few questions, I had alternating As and Ds, so I think you may have been on the right track!

[AnneZ]

I just don't have time to do multiple choices, calculations for me are pretty easy, but there are diagram questions or other wordy questions, i just don't want read them. Specially for multiple choices, I fell like I will got a lot of marks down

[Arib]

Hey...For the first few questions, I had alternating As and Ds, so I think you may have been on the right track!

OMG same i had a lot of As and Ds in the start too!!

[NinjaDatHSC1]

2 things:

Did you guys pick site x or y? (I picked y cause i said it would be hard for them to filter out the Ca cause it's in ppm which is very small units)


And for industrial chemistry, did you guys times the equilibrium constant question equation by 2? Would it give the same answer if you had a square root for one of them instead?

[MisterNeo]

2 things:

Did you guys pick site x or y? (I picked y cause i said it would be hard for them to filter out the Ca cause it's in ppm which is very small units)


And for industrial chemistry, did you guys types the equilibrium constant equation by 2? Would it give the same answer if you had a square root for one of them instead?

I picked Site Y and said that you can flocculate the suspended particles that make the water turbid, then use the sediment tank and sand filters. (idk if that's correct lol).
I used the square root for O₂ when calculating Q, since they asked for that specific equation so I didn't want to risk it by using the x2 equation.

[kauac]

Did you guys pick site x or y? (I picked y cause i said it would be hard for them to filter out the Ca cause it's in ppm which is very small units)

Yes I picked site Y too... The turbidity and pH were the two inadequate aspects of the sample, though they could be improved with the designated purification processes listed. I wrote a similar justification about the calcium ions as well.

[NinjaDatHSC1]

I picked Site Y and said that you can flocculate the suspended particles that make the water turbid, then use the sediment tank and sand filters. (idk if that's correct lol).
I used the square root for O₂ when calculating Q, since they asked for that specific equation so I didn't want to risk it by using the x2 equation.

Yeah i pretty much said what you did, except i didn't write flocculation cause i didn't know if they had a flocculant (I didn't see it in the equipment that was given) - i just said sedimentation and then sand filter it

[liya1234]

I found it okay but some of the multiple choice and the first half of industrial chem threw me off a bit. What were we supposed to do for that first industrial chem q bc they gave us an ester not a triglyceride??

[MisterNeo]

I found it okay but some of the multiple choice and the first half of industrial chem threw me off a bit. What were we supposed to do for that first industrial chem q bc they gave us an ester not a triglyceride??

I said this for ethyl propanoate, but not entirely sure if it's correct.

It does produce an alcohol and a carboxylate salt like the other saponification reactions, so maybe.

[toasted]

what did everyone put for the equillibrium of the carbonic acid and decrease in pressure q and the q about the equillibrium and which possible equation it was in the mc? 16 and 18 i think

[NinjaDatHSC1]

Sorry why is question one d. I put A? Isn't a burette more accurate to TRANSFER a quantity, rather than measure?

Yes you are quite right! Thank you for notifying me about my error! I wasn't reading the question properly and was thinking more of a volumetric flask!

[Em444]

Hi...

I thought the short answer section was beautiful with easily understandable questions.
Multiple choice was average.
Out of the probably 15 other people in the state who did the biochemistry of movement option, I found it pretty good, except for one nasty calculation question.

Overall it was fairly nice!

Hi!
Is biochemistry of movement interesting? I looked at the syllabus for it and think I would have liked it. My teacher is a bio/chem teacher as well so she would have done it except there are more resources for shipwrecks

I found the exam ok, looking at the multiple choice I think I got a lot wrong, I tried to get through them quickly because I'm a slow writer and I'm thinking I shouldn't have

The haber process question was great! I only talked about temperature, pressure and the catalyst and linked them all to reaction energy, reaction rate and yield, do you think that was enough?

[angelahchan]

The haber process question was great! I only talked about temperature, pressure and the catalyst and linked them all to reaction energy, reaction rate and yield, do you think that was enough?

I think you should mention liquefying ammonia as well as correct mole ratio of nitrogen to hydrogen 

[ellybubble]

A, a lot of As

me 2! one of our chem teachers said the answer to Q1 was also A (i changed it in the last 30 seconds)

[browniesandpuppies]

For 13, isn't it the strongest acid that would require the most amount of NaOH? I chose H2SO4 because it is diprotic and hence would require the most amount of NaOH