Q19 Bauklkham Hills. Module 7 addition polymerization (2 Viewers)

[Interdice]

Answer is C. I got B

I looked at the Edrolo lesson, and while I memorized the 4 addition polymers, I can't figure out why the answer was C. Could someone give an explanation? Thanks.

 

[SadCeliac]

View attachment 39803
Answer is C. I got B

I looked at the Edrolo lesson, and while I memorized the 4 addition polymers, I can't figure out why the answer was C. Could someone give an explanation? Thanks.

ngl I would have said B as well

 

[Interdice]

dimethylbutanol - Google Search

www.google.com

it says that the answer is 10 for some reason. I count 14 hydrogen atoms.

 

[carrotsss]

https://boredofstudies.org/threads/polymers.404689/ synthesis posted the first question a while ago, you’re right

you’re right on the second q too

 

[Interdice]

https://boredofstudies.org/threads/polymers.404689/ synthesis posted the first question a while ago, you’re right

you’re right on the second q too

Oh my bad. Didn't think the same q would be posted twice

 

[carrotsss]

Oh my bad. Didn't think the same q would be posted twice

nah it’s all good he didn’t put the paper in the title or anything so it’d be pretty hard to find

 

[Interdice]

 

[Interdice]

I screwed up and got D lol. I see my mistake now. I was gonna correct him/her. Good thing I didnt.

i got 8.8 x 10^4.

I got
4 carbon atoms
2 oxygen atoms
8 hydrogen atoms

Figured it out. 6 hydrogen atoms. Not 8

 

[Interdice]

nah it’s all good he didn’t put the paper in the title or anything so it’d be pretty hard to find

Know any trial papers with accurate solutions? I have also been doing physics, and for one I caught mistakes. It was the Sydney Boys half yearly. It's been pulled now.

 

[carrotsss]

Know any trial papers with accurate solutions? I have also been doing physics, and for one I caught mistakes. It was the Sydney Boys half yearly. It's been pulled now.

I don’t really remember any specifically without mistakes (I’ve definitely done them though), most papers are fine if you avoid CSSA and lower tier schools

 

[SadCeliac]

nah it’s all good he didn’t put the paper in the title or anything so it’d be pretty hard to find

(he originally posted under like religion or something) @synthesisFR

 

[Interdice]

Same paper

 

[Interdice]

 

[Interdice]

 

[Interdice]

Few problems

 

[Interdice]

Firstly HCL reacted uses 4 sig figs. not 3.

Secondly moles of CaCO3 = moles of HCl.

This n(CaCO3) = 0.0136.

m = 0.0136x(40+16x3 + 12)
m = 1.36 approx.

However the mass is 600 grams for soem reason.

Help

 

[carrotsss]

Firstly HCL reacted uses 4 sig figs. not 3.

Secondly moles of CaCO3 = moles of HCl.

This n(CaCO3) = 0.0136.

m = 0.0136x(40+16x3 + 12)
m = 1.36 approx.

However the mass is 600 grams for soem reason.

Help

yeah u right

 

[Interdice]

yeah u right

I still don't get how trials can have so many wrong answers

 

[carrotsss]

I still don't get how trials can have so many wrong answers

the teachers writing the papers are just average everyday teachers who have to do it on top of their normal job and with very limited time (and obv a strict deadline), they cant really be expected to make a flawless paper like the hsc which has like a year of a board of people working on it

 

[Interdice]

the teachers writing the papers are just average everyday teachers who have to do it on top of their normal job and with very limited time (and obv a strict deadline), they cant really be expected to make a flawless paper like the hsc which has like a year of a board of people working on it

Even bought trials sometimes have mistakes though. At my high school we bought the physics trial.

They fucked up with a simple sub in the formula question and the teacher gave us all extra marks. Except for the student who actually lost a mark, and begged the teacher lol.