VCE Chemistry Exam Discussion and Solutions (in progress)

[faktorlm]

I'd like to think the manipulated variable would have been the sample used, i.e. the tartaric acid sample itself, since we are testing the validity of the manufacturer's claim on the purity of the product.

That's what I had, the SOURCE of the tartaric acid.

[St123]

Does anyone remember whether the answer to the multi choice question about the pH increase/decrease during recharge of a car battery was A or B. I’m scared I shaded the wrong bubble and put down a pH increase

[JaeSunRyoo]

Does anyone remember whether the answer to the multi choice question about the pH increase/decrease during recharge of a car battery was A or B. I’m scared I shaded the wrong bubble and put down a pH increase

I put down decrease in pH and chemical energy converted into electrical energy.

Thinking back on it now, I think I may have gotten it wrong.

[Willba99]

I put down decrease in pH and chemical energy converted into electrical energy.

Thinking back on it now, I think I may have gotten it wrong.

I think it was a decrease in pH (because the concentration of H+ increases) and a conversion of electrical energy to chemical energy (as an external power source supplies electrical energy to reverse and "reset" the chemical reaction)

Hope this makes sense

[JaeSunRyoo]

I think it was a decrease in pH (because the concentration of H+ increases) and a conversion of electrical energy to chemical energy (as an external power source supplies electrical energy to reverse and "reset" the chemical reaction)

Hope this makes sense

Ahhh, the external power source.

I forgot about that. Oh well.

[The Bus]

I think it was a decrease in pH (because the concentration of H+ increases) and a conversion of electrical energy to chemical energy (as an external power source supplies electrical energy to reverse and "reset" the chemical reaction)

Hope this makes sense

It was D right?

[messi10]

Does anyone remember whether the answer to the multi choice question about the pH increase/decrease during recharge of a car battery was A or B. I’m scared I shaded the wrong bubble and put down a pH increase

The reaction given was the overall discharging reaction and H+ was a reactant meaning pH increases. However the question asks us what happens during discharge so H+ is a product hence ph decreases and since its recharging, conversion from electrical to chemical energy

[Willba99]

It was D right?

I think so yeah

[tigerlily28]

solutions up yet?

[JaeSunRyoo]

Doesn't seem like it.

Is there some issue with copyright, or was that just a joke?

[Willba99]

Doesn't seem like it.

Is there some issue with copyright, or was that just a joke?

More likely that its much harder for every day Joe's i.e. not VCAA assessors to write solutions for a very qualitative Chemistry exam when compared to something like Methods. In Maths theres one right answer and everything else is wrong, but for something like that Mars question it would be very difficult for someone outside of the official assessors to come up with an accurate marking scheme.

My advice - don't worry about it. Go to parties, sleep in. You can't change an exam you've already sat so imo theres no point thinking about it.

[JaeSunRyoo]

Good advice.

[lovebiology]

how about solutions for multi choice？

[flozza00]

So this is what I got: 
1D 2A 3D 4B 5B 6C 7B 8A 9C 10D 11C 12A 13A 14D 15B 16A 17C 18B 19D 20D 21B 22C 23A 24C 25A 26A 27A 28C 29D 30B
but I have been known to make the odd mistake!

[LRog99]

More likely that its much harder for every day Joe's i.e. not VCAA assessors to write solutions for a very qualitative Chemistry exam when compared to something like Methods. In Maths theres one right answer and everything else is wrong, but for something like that Mars question it would be very difficult for someone outside of the official assessors to come up with an accurate marking scheme.

My advice - don't worry about it. Go to parties, sleep in. You can't change an exam you've already sat so imo theres no point thinking about it.

But is the actual exam even up? I can't find it anywhere?