VCE Chemistry Exam Discussion and Solutions (in progress)

[finn_smith]

In relation to the battery question, the answer was B. I discussed with my teacher and we also discovered in the heineman textbook that low temperatures are not ideal for battery recharges. Negative 8 degrees Celsius is quite extreme for battery recharging ... also see this link for further validation, more specifically the paragraph labelled ‘Low-Temperature Charge’: http://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

[waterangel82]

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

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

I don't know... cause I'm pretty sure that it was talking about mass in undiluted coffee of 350 mL, and the graph showed 0.04g/L when a 5 mL sample was diluted to 50mL, so I took into account of the dilution factor and multiplied concentration by 10?

[occidit]

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

Care the molar ratios

[JaeSunRyoo]

I don't know... cause I'm pretty sure that it was talking about mass in undiluted coffee of 350 mL, and the graph showed 0.04g/L when a 5 mL sample was diluted to 50mL, so I took into account of the dilution factor and multiplied concentration by 10?

Now I don't even know what answer I wrote XD

[dov4k]

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

No, you had to convert it to M, as they gave the question in mol

[messi10]

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?

the dietry fibres had to be excluded from the calculations, isnt that right?

[Deonyi]

Oh of course; silly me.

I think I got 0·014g of caffeine and 14% of protein.

[waterangel82]

the dietry fibres had to be excluded from the calculations, isnt that right?

Yeah - there was no data for energy that fibre provides anyway - only proteins, fats and carbs

[messi10]

How hard is it to get a 35+ ssc in this subject, like roughly what exam score do you need? Anyone with experience or knowledge, not only me, many others will benefit from your reply
thanks 

[messi10]

Multi choice the most effective way for that vitamin C and D thingy, what did u guys put?

[crackleking]

In relation to the battery question, the answer was B. I discussed with my teacher and we also discovered in the heineman textbook that low temperatures are not ideal for battery recharges. Negative 8 degrees Celsius is quite extreme for battery recharging ... also see this link for further validation, more specifically the paragraph labelled ‘Low-Temperature Charge’:
http://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatures

I chose b as well as thas temperature wasn't as low as A but also wasn't as high and had the smallest difference between max and mix temp.

[ameeria1002]

Multi choice the most effective way for that vitamin C and D thingy, what did u guys put?

I think I put A (the one that said eat oranges and sit outside with sun protection) because you can't chemically dissolve a vitamin D tablet (since it's non-polar) in water like you can with a vitamin C tablet and drink it. That's just my logic behind it, could possibly be wrong though

[JaeSunRyoo]

I think I put A (the one that said eat oranges and sit outside with sun protection) because you can't chemically dissolve a vitamin D tablet (since it's non-polar) in water like you can with a vitamin C tablet and drink it. That's just my logic behind it, could possibly be wrong though

I chose the supplement oils and the citrus fruits. Seems like everyone has their own opinion on this, lol.

I just chose the oils because I know that vitamin tablets aren't the most efficient or effective way of fixing deficiencies, and for being in the sun? Eh... even with sun protection, stay out for one hour... I don't know, really.

[docdave]

The independent variable was the identity or brand of the tartaric acid sample.

[messi10]

I chose the supplement oils and the citrus fruits. Seems like everyone has their own opinion on this, lol.

I just chose the oils because I know that vitamin tablets aren't the most efficient or effective way of fixing deficiencies, and for being in the sun? Eh... even with sun protection, stay out for one hour... I don't know, really.

Yeah I did the same!