VCE Chemistry Question Thread

[HopefulLawStudent]

thanks for the response, should I not touch any of the exams pre 2008?
And if someone hypothetically had a hypothetical stash of exams on a dropbox could they please hypothetically message me.
hypothetically.

Don't most schools have heeeeaaaaps of practice exams on hand anyway? At my school, we legit have a classroom that's used purely as a storage space for printed math and science practice exams (let's not discuss the amount of money my school spends annually on printing and paper because the number's so big it's shameful considering no one has the time to go through THAT many exams).

[Swagadaktal]

Don't most schools have heeeeaaaaps of practice exams on hand anyway? At my school, we legit have a classroom that's used purely as a storage space for printed math and science practice exams (let's not discuss the amount of money my school spends annually on printing and paper because the number's so big it's shameful considering no one has the time to go through THAT many exams).

Yeah they have a decent amount, it's kinda early atm to be asking for exams tho soo
Why they print why not just give u online version :O

[HopefulLawStudent]

You pose a very good point.

Tbh. My school's math and science teachers have a thing against technology so them giving an online version is like Santa Claus being real, that's how shocking it'd be.

[JellyBeanz]

You pose a very good point.

Tbh. My school's math and science teachers have a thing against technology so them giving an online version is like Santa Claus being real, that's how shocking it'd be.

That's my spesh teacher, don't know why he's so against the use of technology lol.

[Elizawei]

(let's not discuss the amount of money my school spends annually on printing and paper because the number's so big it's shameful considering no one has the time to go through THAT many exams).

Ugh my school makes us pay for printing.... can barely afford to print heaps of practise exams lol 

[JellyBeanz]

Ugh my school makes us pay for printing.... can barely afford to print heaps of practise exams lol 

What? O_O

Damn, i have come to the realisation that schools are way too diverse in the way they handle practice exams. our school just gives us digital copies.

[Elizawei]

What? O_O

Damn, i have come to the realisation that schools are way too diverse in the way they handle practice exams. our school just gives us digital copies.

Haha they give us digital copies but I kinda prefer doing them on the printed sheets My printing balance has not risen above 5 dollars all year haha xD

[JellyBeanz]

Haha they give us digital copies but I kinda prefer doing them on the printed sheets My printing balance has not risen above 5 dollars all year haha xD

I prefer doing them on the printed sheets too , that's why i print them at home.

[knightrider]

Basically the functional group of acetic anhydride (i.e.. the oxygen in the middle bonded to 2 Carbons, which are in turn both doubled bonded to an oxygen each) is called an "acid anhydride" group. You do not need to know this for VCE Chem, however; all you need to know is the structure of acetic anhydride.

Thanks abc12345j 

[JellyBeanz]

Could someone please explain how exactly pressure affects an equilibrium system? I understand that the system will adjust to the increased pressure according to Le Chatelier's principle, but I'm not exactly sure how it actually happens.

Thanks

[smiley123]

Hi, I was wondering if anyone could provide me with errors and their impact in uv-vis spectroscopy?

[jyce]

Could someone please explain how exactly pressure affects an equilibrium system? I understand that the system will adjust to the increased pressure according to Le Chatelier's principle, but I'm not exactly sure how it actually happens.

Thanks

Let's say we have an increase in pressure / a decrease in volume. What that means is that now, in a given space, there are more reactant/product particles. According to Le Chatelier's principle, there will be either a net forward or net backward reaction to oppose this change, i.e. to decrease the pressure or reduce the number of particles in a given space. To do this, the equilibrium will shift towards the direction with the fewer particles. For example, if we were looking at the reaction 2H₂(g) + O₂(g) -> 2H₂O(g), the system would respond to an increase in pressure with a net forward reaction, as this would take three particles and make only two particles. On the other hand, when there is a decrease in pressure / an increase in volume, there will be a net reaction in the direction that produces more particles. This could be either the forward or backward direction, it depends on the specific reaction.

Does this make sense?

[JellyBeanz]

Let's say we have an increase in pressure / a decrease in volume. What that means is that now, in a given space, there are more reactant/product particles. According to Le Chatelier's principle, there will be either a net forward or net backward reaction to oppose this change, i.e. to decrease the pressure or reduce the number of particles in a given space. To do this, the equilibrium will shift towards the direction with the fewer particles. For example, if we were looking at the reaction 2H₂(g) + O₂(g) -> 2H₂O(g), the system would respond to an increase in pressure with a net forward reaction, as this would take three particles and make only two particles. On the other hand, when there is a decrease in pressure / an increase in volume, there will be a net reaction in the direction that produces more particles. This could be either the forward or backward direction, it depends on the specific reaction.

Does this make sense?

Ahh yes, i see, thanks alot Jyce!
I was confused about the particles in an equation having those effects in an equilibrium system when changes occur.But now it makes sense.

[HasibA]

http://imgur.com/2onwuGj
any help with interpreting what's going on in the question and dissecting relevant information from it? seem to get lost in that big wall of text :p thank you guys

[blacksanta62]

Can anyone give me an explanation on cyclic molecules? There's a gap in my notebook and I keep forgetting to ask my chemistry teacher (probs ask him tomorrow tbh)