HSC Chemistry Question Thread

[beau77bro]

Ohhh ok yea no thankyou, so just the ions that take part Hahaha sorry I'll word it better next question

[beau77bro]

Omg sorry that doesn't even make sense, thanks Jake I'll do better next time hopefully

[jakesilove]

Omg sorry that doesn't even make sense, thanks Jake I'll do better next time hopefully

Aha nah I understand what you mean! There's just so much going on when it comes to Chemistry, it's hard to stay on top of all the terminology

[Aaron12038488]

So I'm in prelim and my first assessment is a Prac. My class has not done the separating techniques only gravimetric analysis. So is it possible that one of the separating techniques is in the Prac. The other class has done all the techniques, so I'm confused why my class hasn't.

[jakesilove]

So I'm in prelim and my first assessment is a Prac. My class has not done the separating techniques only gravimetric analysis. So is it possible that one of the separating techniques is in the Prac. The other class has done all the techniques, so I'm confused why my class hasn't.

Hey!

As a general rule, your teacher will not assess you on anything they haven't taught you in class. It would be very easy for you to go to the head of Science, or the school, if they unfairly assessed you (particularly if one class has done the work, and another class has not). So, I think it's worth talking to some classmates about whether you REALLY haven't done the learning required for gravimetric analysis. If not, I wouldn't worry about it. Also, the best course of action is always to just ask your teacher

[mylinh-nguyen]

Can someone explain how reverse titration works and the difference between normal titration? I'm concerned my assessment task it will be that.
also does it matter how much indicator you use in the solution with unknown concentration?

[shreya_ajoshi]

Can someone explain how reverse titration works and the difference between normal titration? I'm concerned my assessment task it will be that.
also does it matter how much indicator you use in the solution with unknown concentration?

By reverse titration, do you mean back titration?
No, the amount of indicator used doesn't really matter. I normally add 5 drops

[jakesilove]

Can someone explain how reverse titration works and the difference between normal titration? I'm concerned my assessment task it will be that.
also does it matter how much indicator you use in the solution with unknown concentration?

The amount of Indicator matters a little bit; the indicator itself is acidic or basic, so by adding it you're changing to pH. This affects the validity of the experiment. So, we try to use as few drops as possible!

[legorgo18]

Hey have a question about the cabbage indicator

So im revising for half yearly and each of my sources have different colours for the cabbage indicator

Can someone please give me the legit ones for the red cabbage indicator

All ive got is pink for acid, blue for neutral and green for base

Thank you

[kiwiberry]

Hey have a question about the cabbage indicator

So im revising for half yearly and each of my sources have different colours for the cabbage indicator

Can someone please give me the legit ones for the red cabbage indicator

All ive got is pink for acid, blue for neutral and green for base

Thank you

This is what I have:
- Pink/red for acidic (1-4)
- Purple for slightly acidic to neutral (4-7)
- Blue for neutral to slightly basic (7-10 but slightly green at 10)
- Green for basic (10-12)
Not sure if legit though!

[jakesilove]

This is what I have:
- Pink/red for acidic (1-4)
- Purple for slightly acidic to neutral (4-7)
- Blue for neutral to slightly basic (7-10 but slightly green at 10)
- Green for basic (10-12)
Not sure if legit though!

Aha at the end of the day, it genuinely varies for cabbage to cabbage. So, this isn't super important, and different sources will say different things. That being said, the above looks legit.

[Mathew587]

Hi can someone help me with this question.
Write overall Redox equations for the following reaction in an acidic environment and identify the oxidising and reducing agent in each case
A) MNO4^-1 (aq) + H2S (aq) -> Mn^2+ (aq) + S(s)

B) ClO^-1 (aq) + SO2 (g) -> Cl^-1(aq) + SO4^2- (aq)

[Ellie__]

Hey guys,

You've probably answered this like 10000000 times, but I was wondering if there is any 'cheat sheet' thing or what the best way to remember likely acids, bases, formulas and valencies for tests. I'm doing the acidic environment currently and have completed the production of materials and there is A LOT of formulas and stuff to remember for 1/2 yearlies so I really want to know how it's best to remember



Thanks Guys!!!!!!!!

[jakesilove]

Hey guys,

You've probably answered this like 10000000 times, but I was wondering if there is any 'cheat sheet' thing or what the best way to remember likely acids, bases, formulas and valencies for tests. I'm doing the acidic environment currently and have completed the production of materials and there is A LOT of formulas and stuff to remember for 1/2 yearlies so I really want to know how it's best to remember



Thanks Guys!!!!!!!!

Hey! Check out this formula sheet that I made a while ago. In my opinion, it has everything you need to memorise! Let me know if you have any questions

[Bubbly_bluey]

Hey guys i'm having trouble in determining whether these equations are redox reactions. How can i tell?

A) Mg + H₂SO⁴ --> MgSO₄ + H₂ (for thisone i said yes b/c Mg is oxidising ang H₂ is reducing???)
B) 2MnO₄^- + 16H⁺ + 10I^- --> 2Mn²⁺+ 5I₂ + 8H₂O