Predictions for Chemistry 2014 HSC? (1 Viewer)

[QZP]

wow < / 3

 

[hundredpercent]

What was your original answer?

I thought itd be sulfuric acid as that is the strongest (citric acid doesnt dissociate completely)

 

[SuchSmallHands]

wow < / 3

soz m8

 

[timeflies]

Since the 2011 Ruse paper does not have solutions, could someone be bothered to do the multiple choice so i can compare my answers against theirs? lol

Count me in too! So 2010 then?

 

[faisalabdul16]

I thought itd be sulfuric acid as that is the strongest (citric acid doesnt dissociate completely)

Yeah, exactly, thats what i thought.

Answers possibly wrong?

 

[faisalabdul16]

Count me in too! So 2010 then?

Yes

 

[faisalabdul16]

Here are my answers for multiple choice

B
B
C
A
D
D
A
A
B
B
D
C
B
C
C
B
C
B
B
C

 

[QZP]

JRAHS 2011 Trials MCQ answers (my own and not confirmed):
1C 2C 3B 4C 5A 6D 7C 8D 9C 10B 11A 12C 13D 14D 15B 16C 17C 18A 19B 20B

Correct answers to incorrect answers above:
2A 8C

 

[QZP]

Yeah, exactly, thats what i thought.

Answers possibly wrong?

No the answer is definitely citric acid During titration, the neutralisation of the citric acid forces the equilibrium to shift forward (ionise). Thus triprotic takes preference over any diprotic/monoprotic acid.

There was actually a HSC question that targeted this exact knowledge (2011 if I recall). Find it

 

[faisalabdul16]

No the answer is definitely citric acid

Explain !

 

[SuchSmallHands]

B
B
C
A
D
D
A
A
B
B
D
C
B
C
C
B
C
B
B
C

Only one disagreement, bring it on.

 

[SuchSmallHands]

You named the molecule, not an isomer of the molecule for q2

 

[faisalabdul16]

You named the molecule, not an isomer of the molecule for q2

oooo yes my bad!

 

[faisalabdul16]

JRAHS 2011 Trials MCQ answers (my own and not confirmed):
1C 2C 3B 4C 5A 6D 7C 8D 9C 10B 11A 12C 13D 14D 15B 16C 17C 18A 19B 20B

2 is A. The whole point of catalytic cracking is to get one alkene and alkane, not 2 alkanes, then it's use is futile.
8 is C. One of the reactions in your answer has no hydrogen in it, therefore isn't a Brownsted-Lowry Acid.

 

[timeflies]

B
B
C
A
D
D
A
A
B
B
D
C
B
C
C
B
C
B
B
C

LOL same as SSH

 

[faisalabdul16]

No the answer is definitely citric acid During titration, the neutralisation of the citric acid forces the equilibrium to shift forward (ionise). Thus triprotic takes preference over any diprotic/monoprotic acid.

There was actually a HSC question that targeted this exact knowledge (2011 if I recall). Find it

But citric is only 7-8% ionised whereas sulfuric is 100%.

 

[QZP]

2 is A. The whole point of catalytic cracking is to get one alkene and alkane, not 2 alkanes, then it's use is futile.
8 is C. One of the reactions in your answer has no hydrogen in it, therefore isn't a Brownsted-Lowry Acid.

LOL damnit I read Q8 wrong nice keep going!! Sigh im terrible

 

[QZP]

But citric is only 7-8% ionised whereas sulfuric is 100%.

As I said, the equilibrium shifts (because H+ is being neutralised to H2O) such that citric acid approaches 100% ionisation.

 

[MrBeefJerky]

These were my answers:
1.D 2.A 3.B 4.B 5. C 6. D 7. B 8. B 9. A 10. C 11. B 12. A 13. B 14. D 15. A 16. A 17. D 18. C 19. C 20. A

 

[faisalabdul16]

LOL damnit I read Q8 wrong nice keep going!! Sigh im terrible

Someone do question 6,7 & 20 of Ruse 2011 multiple choice pls.

Need more people to validate answers for 2011 paper