HSC 2012-2015 Chemistry Marathon (archive) (6 Viewers)

[leehuan]

re: HSC Chemistry Marathon Archive

You are given unknown solutions of sodium carbonate, sodium chloride and potassium sulfate, and you do not know which one is which.

You are then given nitric acid, silver nitrate, and barium nitrate.

(i) Design a suitable method using your known solutions to determine which unknown solution is which. (3)
(ii) Write suitable chemical equations to support your expected observations. (2)


Forgive me, I've only just started chemical monitoring & management.

 

[trumanblack]

re: HSC Chemistry Marathon Archive

Quick question, how would you draw a flow-chart to acceptable HSC chemistry standards? I know obviously to use a ruler and pencil and such, but any other specifications? e.g. separate shapes to distinguish added chemicals to processes? acceptable to have chemical equations hanging on the side?

 

[Kaido]

re: HSC Chemistry Marathon Archive

You are given unknown solutions of sodium carbonate, sodium chloride and potassium sulfate, and you do not know which one is which.

You are then given nitric acid, silver nitrate, and barium nitrate.

(i) Design a suitable method using your known solutions to determine which unknown solution is which. (3)
(ii) Write suitable chemical equations to support your expected observations. (2)


Forgive me, I've only just started chemical monitoring & management.

simply refer to the solubility table + tests for common cations/anions

 

[Kaido]

re: HSC Chemistry Marathon Archive

Quick question, how would you draw a flow-chart to acceptable HSC chemistry standards? I know obviously to use a ruler and pencil and such, but any other specifications? e.g. separate shapes to distinguish added chemicals to processes? acceptable to have chemical equations hanging on the side?

No, there's no need to be fancy or anything like that.
Communicate your knowledge in a clear and concise manner through neat diagrams is enough

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

You are given unknown solutions of sodium carbonate, sodium chloride and potassium sulfate, and you do not know which one is which.

You are then given nitric acid, silver nitrate, and barium nitrate.

(i) Design a suitable method using your known solutions to determine which unknown solution is which. (3)
(ii) Write suitable chemical equations to support your expected observations. (2)


Forgive me, I've only just started chemical monitoring & management.

i) Mix the Nitric acid in the solution if it bubbles theres carbonate present Sodium Carbonate

ii) Mix sodium chloride and if a white precipitate forms the solution is Silver nitrate

iii) Mix barium nitrate into the solution and if a white precipitate forms it is potassium sulfate

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

Quick question, how would you draw a flow-chart to acceptable HSC chemistry standards? I know obviously to use a ruler and pencil and such, but any other specifications? e.g. separate shapes to distinguish added chemicals to processes? acceptable to have chemical equations hanging on the side?

Never used a pencil for diagrams or a ruler :L...

 

[Speed6]

re: HSC Chemistry Marathon Archive

Bump

 

[hawkrider]

re: HSC Chemistry Marathon Archive

Never used a pencil for diagrams or a ruler :L...

gg no re

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

gg no re

Maybe thats why im getting crap in chem...

 

[liquid_soda]

re: HSC Chemistry Marathon Archive

Maybe thats why im getting crap in chem...

I use pencil but seeing that they scan hsc exams my diagrams won't pick up. wtf

 

[Librah]

re: HSC Chemistry Marathon Archive

Never used a pencil for diagrams or a ruler :L...

I didn't bring a ruler or pencil into my HSC exam. Tables/diagram were done in pen, and i used the edge of my paper as a ruler.

 

[Librah]

re: HSC Chemistry Marathon Archive

Preparation/10.

 

[liquid_soda]

re: HSC Chemistry Marathon Archive

Aren't we only supposed to use dark pen in all external hsc exams? Is pencil even allowed?

 

[Crisium]

re: HSC Chemistry Marathon Archive

Aren't we only supposed to use dark pen in all external hsc exams? Is pencil even allowed?

For drawing diagrams and tables

But the interior of these tables and the labelling of diagrams should be done in pen

 

[Librah]

re: HSC Chemistry Marathon Archive

I got 7/7 for my freehand pen-drawn table. I doubt they actually care, your not being assessed on how well you can swap stationary devices.

 

[liquid_soda]

re: HSC Chemistry Marathon Archive

For drawing diagrams and tables

But the interior of these tables and the labelling of diagrams should be done in pen

Paper scanning will pick up our pencil diagrams and tables?

 

[DepressedPenguino]

re: HSC Chemistry Marathon Archive

Paper scanning will pick up our pencil diagrams and tables?

I would just use pen but if u are really afraid that you would make a big mistake, use a 2B pencil as they are dark enough to be seen after scanning

 

[Drsoccerball]

re: HSC Chemistry Marathon Archive

What do you do with a dead chemist

 

[Librah]

re: HSC Chemistry Marathon Archive

What do you do with a dead chemist

Bury him.

 

[leehuan]

re: HSC Chemistry Marathon Archive

You should know this. If you can't curium, nor can you helium, you have to barium. It appears in the HSC every year!

Ok, no.
-------------------
Outline the most optimal conditions for the production of ammonia in the Haber process. Explain why these conditions are suitable. In your response, make reference to Le Chatelier's principle on the system's equilibrium. (4)

This is a horribly worded question...