HSC Chemistry Question Thread

[massive]

Guys I don't get the sample answer, I always thought citric acid is more of a stronger acid than acetic because its triprotic :S

[noonedoesnt]

Can they actually ask this in hsc!

[jakesilove]

Guys I don't get the sample answer, I always thought citric acid is more of a stronger acid than acetic because its triprotic :S

Nup, turns out that acetic acid is stronger than citric acid. That's just a fact, memorise it!

[jakesilove]

Can they actually ask this in hsc!

I didn't do Industrial, but if that is an HSC question, then yes they certainly can!

[lha]

How do you do this question? I dont recall doing this experiment...

During  your  practical  work  you performed a  first-hand investigation  to observe the  reactions of  sulfuric acid acting as an oxidising agent.
Outline a  conclusion  drawn  from  the  results of  this  investigation and  assess  the     validity  of   this  conclusion.

[:3]

Can they actually ask this in hsc!

Pretty sure they can ask this and the process itself (i.e. draw the structural equations of soap + glycerol being made from fat and base).

[:3]

How do you do this question? I dont recall doing this experiment...

During  your  practical  work  you performed a  first-hand investigation  to observe the  reactions of  sulfuric acid acting as an oxidising agent.
Outline a  conclusion  drawn  from  the  results of  this  investigation and  assess  the     validity  of   this  conclusion.

I believe one of them was sulfuric acid reacting with zinc metal to produce ZnSO4 and Hydrogen Gas.

[lha]

I believe one of them was sulfuric acid reacting with zinc metal to produce ZnSO4 and Hydrogen Gas.

How would you answer the question then? I have no idea what to write...

[Cindy2k16]

Hi for this question the BOSTES sample answer has the depletion of ozone by CFCs. Is it still correct if i wrote equations for the natural depletion of ozone?
TIA

[jakesilove]

Hi for this question the BOSTES sample answer has the depletion of ozone by CFCs. Is it still correct if i wrote equations for the natural depletion of ozone?
TIA

Technically, you'd definitely get the marks (the question doesn't specify CFCs), however I would recommend sticking to the dotpoints where applicable

[massive]

Hey guys, are you meant to use c1v1=c2v2 for this question?? because i tried that and got 13.301... but the answer is 13.25

[Cindy2k16]

Hi how come in this reaction Cl gas isn't being produced at the anode? TIA

[noonedoesnt]

Hi how come in this reaction Cl gas isn't being produced at the anode? TIA

Hi cindy

The question states that it is an 0.05 mol/L solution of NaCl

Thus it is a dilute solution. Electrolysis of a dilute solution results in the oxidation of water at the anode and the reduction of water at the cathode.

Note: In a concentrated NaCl solution, Cl is oxidised at anode, and water is reduced at cathode. Whilst in a liquid/molten solution, Na is reduced and Cl is oxidised.

[noonedoesnt]

Anyone have an idea?

[Furrrball]

Hey guys, are you meant to use c1v1=c2v2 for this question?? because i tried that and got 13.301... but the answer is 13.25

Hope this makes sense

http://imgur.com/Fc4ehZQ