VCE Chemistry Question Thread

[anne198]

Does anyone have answers to the following practice exams


Lisachem 2016
Stav 2016
Insight 2017
Neap 2016
Lisa chem 2015
Kiblaha 2017

[zenith101]

besides temperature, are there any other types of values we don't consider when determining correct sig figs?

[Freddie Hg]

besides temperature, are there any other types of values we don't consider when determining correct sig figs?

why wouldnt you consider temperature.
any and all values USED in a calculation is considered!!

[vceme]

besides temperature, are there any other types of values we don't consider when determining correct sig figs?

sig figs is dependent on the data given

[passbleh24]

Hey could someone please share their opinion on the exam difficulty of 2018 nth exam and last year's 2017 exam ? I personally found the nth one more difficult.

Thanks

[Freddie Hg]

Hey could someone please share their opinion on the exam difficulty of 2018 nth exam and last year's 2017 exam ? I personally found the nth one more difficult.

Thanks

NHT was deadset insane! praying its not that hard on tuesday hopefully it isnt. at the start of my chem exam prep i was aiming for an above 45 (my appraisal after doing 2013 exams onwards) after the nht 2018 i realised that vcaa was capable of destroying me on tuesday.
sorry if i sound negative, but there is a high possibility if not 100% tuesday will be just as hard if not harder. telling from this years methods exam 1, subjects like chem there is no boundaries. i wish i was in year 12 during 2016 and lower
again apologies with negativity you dont need to hear this. its just my personal sentiment  which you asked for

[passbleh24]

NHT was deadset insane! praying its not that hard on tuesday hopefully it wasnt. at the start of my chem exam prep i was aiming for an above 45 (my appraisal after doing 2013 exams onwards) after the nht 2018 i realised that vcaa was capable of destroying me on tuesday.
sorry if i sound negative, but there is a high possibility if not 100% tuesday will be just as hard if not harder. telling from this years methods exam 1, subjects like chem there is no boundaries. i wish i was in year 12 during 2016 and lower
again apologies with negativity you dont need to hear this. its just my personal sentiment  which you asked for

Yep i asked for an opinion, thanks !!
I think its all the explanation questions regarding the experiments that keeps getting more confusing each year.

[vceme]

does anyone have any tips/ notes for experimental design questions or is it just a matter of doing questions? bombing out on these type of questions is just a rip.

[Freddie Hg]

Yep i asked for an opinion, thanks !!
I think its all the explanation questions regarding the experiments that keeps getting more confusing each year.

i think they realised that the state doesnt struggle with the calculations rather with ambiguous questions regarding nuanced explanations like you said.
good luck man

does anyone have any tips/ notes for experimental design questions or is it just a matter of doing questions? bombing out on these type of questions is just a rip.

just question everythig/analyse everything there is,  as its there for a reason
tbh i suck at these too
i think the issue was throughout the year my school asked normal test questions in the sac (i scored well on those getting above 95% sac avg) but i found i wasnt ready to analyse experiments. things like accuracy validity and reliability wasnt cemented nor was the ability to critically evaluate experimental designs rather than the theory behind them 

[vceme]

i think the issue was throughout the year my school asked normal test questions in the sac (i scored well on those getting above 95% sac avg) but i found i wasnt ready to analyse experiments. things like accuracy validity and reliability wasnt cemented nor was the ability to critically evaluate experimental designs rather than the theory behind them

yeah i feel like sacs should always try to incorporate some sort of experimental design questions not just the scientific poster  cause its DRAAAAGGING my score down

[hums_student]

yeah i feel like sacs should always try to incorporate some sort of experimental design questions not just the scientific poster  cause its DRAAAAGGING my score down

Relatable one of the recent VCAA papers asked for the independent variable of a bloody titration experiment. That messed everyone up. Hopefully they'll be nicer this year but then again VCAA's rarely known for being nice.

why wouldnt you consider temperature.
any and all values USED in a calculation is considered!!

Not 100% sure on this, but I think calculations involving temperature are generally addition and subtraction (eg. determining delta T), and when doing adding/subtracting you don't look at sig figs - only decimal places.
So like if the original temperature was say, 20.3 degrees Celsius and final temperature was 25.42 degrees Celsius you would leave your answer as 5.1 -- least number of decimal places -- even if the correct answer should technically be 5.12.

Can anyone please confirm? I'm not 100% confident on this and don't want to accidentally misinform people lol.

[Bri MT]

Not 100% sure on this, but I think calculations involving temperature are generally addition and subtraction (eg. determining delta T), and when doing adding/subtracting you don't look at sig figs - only decimal places.
So like if the original temperature was say, 20.3 degrees Celsius and final temperature was 25.42 degrees Celsius you would leave your answer as 5.1 -- least number of decimal places -- even if the correct answer should technically be 5.12.

Can anyone please confirm? I'm not 100% confident on this and don't want to accidentally misinform people lol.

Addition and subtraction is dp not sig figs

[Lear]

I had the understanding that since the graph is only provided with integer values and we find the temperature change by minusing (visually) 28-24, we should have the calculated CF to 0 decimal places. However, the answer says 2.13 while I think it should be 2
Thoughts?

[hums_student]

(Image removed from quote.)

I had the understanding that since the graph is only provided with integer values and we find the temperature change by minusing (visually) 28-24, we should have the calculated CF to 0 decimal places. However, the answer says 2.13 while I think it should be 2
Thoughts?

You find delta T through 28-24 to get 4, but the rest of the calculations are all using sig figs, not decimal places.
n(C10H8) = m/M = 0.212/128 = 0.001656mol
E = n x delta Hc = 8.50153kj
CF = E/delta T = 8.50153kj / 4 = 2.1254 Kj / C = 2.13 Kj/C to 3 sig figs.

I think when your calculations involve a number like "4" not "4.0" then you ignore the sig figs in calculations?

[vceme]

(Image removed from quote.)

I had the understanding that since the graph is only provided with integer values and we find the temperature change by minusing (visually) 28-24, we should have the calculated CF to 0 decimal places. However, the answer says 2.13 while I think it should be 2
Thoughts?

I think when your calculations involve a number like "4" not "4.0" then you ignore the sig figs in calculations?

teacher notes i have:
When doing a calculation in chem involving either multiplication or division, the answer must be given the same number of sig figures as the piece of DATA containing the least number of sig figures.

If a calculation requires only ADDITION OR SUBTRACTION, the final answer must have the same number of decimal places as the piece of DATA containing the least number of decimal places.

So I think from your question Lear, the data is the table labelled as data and not the graph which is to 3 sig figures, so thus it's 2.13 and not 2