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VCE Chemistry Question Thread

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TnGn74:

--- Quote from: arnavg2207 on March 14, 2022, 02:49:28 pm ---Hey, for combustion reactions and thermochemical equations I was wondering if you give the state of water as (l) or (g)? The answers seem to be inconsistent (for the combustion of octane one gives it as liquid while the other gives it as solid)

Thanks!

--- End quote ---

I would give H2O(g) for combustion reactions (because hot) in general. Give H2O(l) if it states a specific temperature <373K or SLC, and that includes when giving a dH from the data book in a thermochemical equation as those values are at SLC.

Arad S:
Hello guys, can anybody help me for writing an aim for an experiment?

This experiment is about the galvanic cell, which there is 6 half cell with 50 ml of their solutions, which we need to determine the voltage produce by each electrochemical cell and determining that which rod is oxidation or reduction.

Thanks!

biology1234:
Why are ionic substances brittle? Thanks

bw304:
hi all, could i have some help with this electrolysis question?

An electrolytic cell was constructed using a sodium chloride solution for the electrolyte, a copper electrode and a zinc electrode. Complete the reduction half-equation, oxidation half-equation and overall equation.

based off the electrochemical series i got:

Reduction half-equation: 2H2O(l) + 2e- --> H2 (g) + 2OH-aq
Oxidation half-equation: Zn(s) --> Zn2+(aq) + 2e-
Overall equation: 2H2O(l) + Zn(s) --> H2 (g) + 2OH-aq + Zn2+(aq)

however the solutions say:

Reduction half-equation: 2H2O(l) + 2e- --> H2 (g) + OH-aq
Oxidation half-equation: Zn(s) --> Zn2+(aq) + 2e-
Overall equation: H2O(l) + Zn(s) --> H2 (g) + Zn2+(aq)

i think there's a balancing error in the solutions for the reduction equation? i'm mainly confused to how they've balanced the final reaction. how come the OH- disappears without any H+ ions being added?
any help would be appreciated!

user28:
Do Sac marks really matter?

Hello, I was wondering if getting a 40% on my chemistry SACs will impact my study score. Should I be worried about these marks?

I want to aim higher but the content is quite difficult at the moment. What's the mark that I should be aiming for to get a decent study score?

Thanks !

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