HSC Chemistry Exam Solutions / Thoughts (5 Viewers)

[AHafza]

what did u guys say for enthaply qn?? and why was it negative?

I spoke about spontaneous and no. Spontaneous reactions

 

[Arrowshaft]

I spoke about spontaneous and no. Spontaneous reactions

Same. Did you say that MgF2 doesn’t dissolve?

 

[Arrowshaft]

I guess one of us is wrong... in the case that u have the right process but Ofc get the answer and conclusion wrong for cu, it’s only a 2 mark deduction? Right?

Ah that’s good. I hope so! I mean I got the calibration curves and everything for both Cu and Pb, hopefully I only lose 2 marks for that, not anymore. Man I hate silly mistakes

 

[AHafza]

Same. Did you say that MgF2 doesn’t dissolve?

Yes under standard conditions doesn’t dissolve... it will only dissolve at low temp white an initial temp required.

 

[AHafza]

Ah that’s good. I hope so! I mean I got the calibration curves and everything for both Cu and Pb, hopefully I only lose 2 marks for that, not anymore. Man I hate silly mistakes

Who knows I may have made the mistake don’t worry it may be my silly mistake..

 

[AHafza]

Yes under standard conditions doesn’t dissolve... it will only dissolve at low temp white an initial temp required.

I gave a bit extra info because I had heaps of time left but the bottom line is it doesn’t dissolve, well i think so.

 

[Arrowshaft]

I gave a bit extra info because I had heaps of time left but the bottom line is it doesn’t dissolve, well i think so.

Did you say for MgCl2 it tends toward a crystal lattice structure but the release of heat during the exothermic process, it distorts and tends toward randomness through freely moving ions in a solution?

 

[AHafza]

Did you say for MgCl2 it tends toward a crystal lattice structure but the release of heat during the exothermic process, it distorts and tends toward randomness through freely moving ions in a solution?

I forgot to make that point

 

[Arrowshaft]

I forgot to make that point

I don’t think they’ll mark with that much detail for a 3 marker so dw. What are your predictions on band 6 cut offs?

 

[flowerp]

Wait did you get effective for cu? I got 1.26 something for Cu...

Yes same I also got that! What did people put for the MC q about radioactiviy and for the last MC q? Kind disappointed about the 3marker on enthalpy and the functional isomer q cuz I got confused about positional and functional isomers but overall the trst was okay ! Also are ketones acidic?

 

[AHafza]

I don’t think they’ll mark with that much detail for a 3 marker so dw. What are your predictions on band 6 cut offs?

I think we are looking at around 80-82 it feels like their are a few questions that are completely new while the exam overall wasn’t too hard

 

[AHafza]

Yes same I also got that! What did people put for the MC q about radioactiviy and for the last MC q? Kind disappointed about the 3marker on enthalpy and the functional isomer q cuz I got confused about positional and functional isomers but overall the trst was okay ! Also are ketones acidic?

Ketones aren’t acidic I’m pretty sure, I used oxidation to differentiate between ketones and aldehydes

 

[flowerp]

I don’t think they’ll mark with that much detail for a 3 marker so dw. What are your predictions on band 6 cut offs?

Probs a high cut off, around 83 maybe??

 

[AHafza]

Yes same I also got that! What did people put for the MC q about radioactiviy and for the last MC q? Kind disappointed about the 3marker on enthalpy and the functional isomer q cuz I got confused about positional and functional isomers but overall the trst was okay ! Also are ketones acidic?

I got 1% for the last one and filtrate only for the radioactivity

 

[flowerp]

Ketones aren’t acidic I’m pretty sure, I used oxidation to differentiate between ketones and aldehydes

Phew! yea same I used oxidation but then to confirm then presence of the acid l also wrote about the litmus test

 

[AHafza]

Phew! yea same I used oxidation but then to confirm then presence of the acid l also wrote about the litmus test

Yep blue litmus turns red

 

[Arrowshaft]

Ketones aren’t acidic I’m pretty sure, I used oxidation to differentiate between ketones and aldehydes

Oxidation and addition of sodium carbonate powder. Whichever bubbles contains aldehyde as it wouldve oxidised to a carboxyllic acid releasing co2

 

[Arrowshaft]

I think we are looking at around 80-82 it feels like their are a few questions that are completely new while the exam overall wasn’t too hard

Hopefully I can band 6 then haha

 

[AHafza]

Oxidation and addition of sodium carbonate powder. Whichever bubbles contains aldehyde as it wouldve oxidised to a carboxyllic acid releasing co2

Can u use blue litmus paper? I was initially going to put co2 effervescence with carbonate but changed it last minute.

 

[AHafza]

Hopefully I can band 6 then haha