prelim content in HSC chem exams (1 Viewer)

[momothemonkey]

hi, just wondering what prelim chem content transfers over to HSC besides calculation basics and inter/intramolecular forces. specifically, will they ever test galvanic cells or nuclear chemistry? tyty

 

[ALolly]

havent really seen galvanic cells but nuclear chem might there in mod 8 i believe

 

[momothemonkey]

Nuclear chem is mod 1 right? On radioactive decay. Mod 8 is more the applications and extra additions to modules 5, 6, and 7. lol there is more "Nuclear chem" in physics mod 8 than chemistry so unless there is something else it would literally take like 10 minutes to revise the nuclear chemistry part of mod 1. I just really don't want gas laws to come back in hsc

okie thanks guys!!

in relation to the last part of your reply (i mean this may not apply to the HSC itself but) my mod 5 internal exam had some terrible ICE table question where you had to incorporate the ideal gas law…(and some titration content for some reason even tho we still to this day haven’t learnt titration in school)

 

[momothemonkey]

okie thanks guys!!

in relation to the last part of your reply (i mean this may not apply to the HSC itself but) my mod 5 internal exam had some terrible ICE table question where you had to incorporate the ideal gas law…

although i doubt they’d be that evil in the HSC, my school js likes to torture us, but regardless id prob revise gas laws if you have some spare time just in case

 

[momothemonkey]

I know what you are talking about, its not really that the questions are hard, but they just take so long and feel so easy to mess up. Are there mod 5 questions that involve titrations or am i misunderstanding?

i mean yeah that’s what the question was. but maybe it’s more the other way around where there may be titration questions that involve mod 5 calculations? we’ve barely even started mod 6 so don’t take my word for it.

 

[momothemonkey]

I've learnt how to do simple titrations yesterday so today when I go through more complex calcs then I'll keep an eye out. Btw there are so many gas law questions for 6.1 its super annoying because I forgot all of that.

what do you mean by 6.1 btw?

 

[WeiWeiMan]

hi, just wondering what prelim chem content transfers over to HSC besides calculation basics and inter/intramolecular forces. specifically, will they ever test galvanic cells or nuclear chemistry? tyty

most of it tbh

imo, unless you're particularly bad at yr11, you don't rly need to revise it cuz you'll cover the stuff you need again in yr12 chem anyway

galvanic cells and nuclear chem aren't part of yr12 chem

I know what you are talking about, its not really that the questions are hard, but they just take so long and feel so easy to mess up. Are there mod 5 questions that involve titrations or am i misunderstanding?

titration is like all of mod 6

havent really seen galvanic cells but nuclear chem might there in mod 8 i believe

nah

 

[momothemonkey]

Properties of acids and bases

ohh, but gas laws? we js finished 6.1 and there wasnt any content relating to gases unless i missed smth?

 

[momothemonkey]

You may finish 6.1 but there are question that'll come up when you go to practice. They arent do bad ig but I had to spend 30 minutes going through that stuff cause I forgot everything

ahh okay thanks for the warning lol

 

[momothemonkey]

If i come cross one tmr I'll just send it. I'm pretty sure a common example is an acid carbonate reaction and they would give u a limiting reagent and be like how much litres of co2 produced so yeah

ohh okie tysm

 

[WeiWeiMan]

ohh, but gas laws? we js finished 6.1 and there wasnt any content relating to gases unless i missed smth?

you'll need gas laws for some mod 5 qns. perhaps random ones in mod 7

it's essentially assumed knowledge anyway. you'll rly just use PV = nRT but it's nice to know what the others are by name

 

[WeiWeiMan]

those abominations

they should be fine once you understand what ur doing

like a certain volume of gas at certain conditions is gonna correspond to a certain amount of gas

 

[ALolly]

loll i kinda forgot they even existed.

 

[jazz519]

Hi I made a list about that previously here: https://boredofstudies.org/threads/...an-experienced-hsc-tutor.388479/#post-7314798

Mainly content that crosses over is to do with ability to write chemical equations, chemical formulas of compounds, moles based calculations like basic ones involving ratios in an equation, concentration of solution and limiting reagents. Other stuff like the galvanic cells is unlikely to be asked about but you should know concepts from it such as what is a redox reaction and the 2 types oxidation, reduction and what the definition of them is since technically that kind of content could come up later on in module 6 and 8 in titrations and chemical analysis type questions.

 

[jazz519]

For the gas laws they are unlikely to ask you to list out all the different ones learnt in year 11 but you need to be able to use the main one that combines all those theories together which is the ideal gas law. That one you don't need to memorise because the data sheet given during exams has that with the PV = nRT formula, as well as the value of the gas constant R listed below it. That ideal gas law can also be used to derive all the other gas laws from it anyways with some algebra working if in the off chance it came up

For instance, if you rearrange the PV = nRT equation to make 'n' the subject you can get all the other Laws. Why do we make n the subject? that's because the moles of a compound will be the exact same even if the temperature, pressure or volume changes since moles is a measure of how much matter there is and that can't be created or destroyed based on Law of conservation of mass.

So if i make n the subject I get:
n = PV/RT

If we have 2 different equations based on like P, V or T being different we get:
n1 = P1V1 / RT1
n2 = P2V2 / RT2

n1 = n2 because as stated above the moles will be conserved
doing simultaneous equations we get
P1V1 / RT1 = P2V2 / RT2

R will cancel out on both sides because it is the Gas Constant which is a fixed value, so we are left with

P1V1/T1 = P2V2/T2
this is the Combined Gas Law of the Boyle's, Charles' and Gay-Lussac's Laws

Then the rest just come directly from that based on what each says:
Boyle's Law has constant temperature so T1 = T2
P1V1/T1 = P2V2/T1
The T1 will cancel out since it's the same giving us the P1V1 = P2V2 (Boyle's Law)

Charle's Law has constant pressure, so P1 = P2
P1V1/T1 = P1V2/T2
P1 cancels so you get V1/T1 = V2/T2 (Charles' Law)

You can do same thing for the Gay Lussac.

So all you need to actually remember for doing all these gas law questions is PV=nRT (Ideal Gas Law) and P1V1 / T1 = P2V2 / T2 (Combined Gas Law)