VCE Chemistry Exam Discussion and Solutions (in progress)

[messi10]

What did everyone get for the lithium battery question, 2nd one in multiple choice? I had no idea what the answer was. Can someone post the answer and explain why they got that
thanks

[flozza00]

for Q2 I got A as it showed the lowest temperatures and for a battery to be rechargeable the products need to stay in contact with the electrodes and this is most likely to happen when diffusion is minimised by low temperature. I couldn't see any other logic to use here

[messi10]

for Q2 I got A as it showed the lowest temperatures and for a battery to be rechargeable the products need to stay in contact with the electrodes and this is most likely to happen when diffusion is minimised by low temperature. I couldn't see any other logic to use here

I see know! Thanks

[SvceS]

What did everyone get for the lithium battery question, 2nd one in multiple choice? I had no idea what the answer was. Can someone post the answer and explain why they got that
thanks

I got A as well just because it made sense that the biggest temperature difference would be the most suitable (witholds for longer) and there were two with the same difference but the other had a high temp range that isn't logical for phone use

[Ahmad_A_1999]

for Q2 I got A as it showed the lowest temperatures and for a battery to be rechargeable the products need to stay in contact with the electrodes and this is most likely to happen when diffusion is minimised by low temperature. I couldn't see any other logic to use here

Same, I thought that would slow the side reactions, but then I wasn't sure about the negative 8 degrees, would that be bad for the battery :/

[JaeSunRyoo]

I'm not sure if I'm right but for the equilibrium constant I got something in the 80s my other mates got 0 point something. Can anyone clarify the right answer please?

81 point something?

If so, then don't worry. Pretty sure that's how you do it, as long as you remembered to convert the mol into M.

[plsbegentle]

81 point something?

If so, then don't worry. Pretty sure that's how you do it, as long as you remembered to convert the mol into M.

81.5 M^-1, im pretty sure

[lovebiology]

What did people get for multiple choice 18, where it asks for the [NH3] following an increase in temperature?

[JaeSunRyoo]

What did people get for multiple choice 18, where it asks for the [NH3] following an increase in temperature?

Increase in rate, decrease in concentration me thinks.

[lovebiology]

What's your answer?

[lovebiology]

Was your answer B?

[Deonyi]

I think I got 20 something for the Kc. Isn't it 1.66^2/(((2-1.66)^2)*(2-1.66/2))?

[dowe]

Seriously considering going to school to get my teacher's copy of the exam and scanning it up. It wont have answers, but it will be something.

[waterangel82]

Could anyone remember what mc question 23 & 24 was on again? I can't really remember, not sure if my answers are correct. Also, did others also get 0.14 g for the caffeine question and 14.0% for the percentage of protein just to double check?

[JaeSunRyoo]

Could anyone remember what mc question 23 & 24 was on again? I can't really remember, not sure if my answers are correct. Also, did others also get 0.14 g for the caffeine question and 14.0% for the percentage of protein just to double check?

23/24 was the HPLC stuff right? Or no?

I think I got A, which was 0.014...