General Thoughts: Chemistry (1 Viewer)

[bhatman]

Also multiple choice solutions (almost 100% sure these are correct):
1: D
2: A
3: B
4: C
5: C
6: B
7: C
8: C
9: A
10: C
11: A
12: C
13: B
14: D
15: D
16: B
17: A
18: D
19: B
20: D

 

[bhatman]

Yeh i wrote it was parallel and linear trend since controlled just inaccurate.

The key thing (again), was not to identify the trend, but to show that it achieved the aim; hence at least partially valid. The validity was compromised by the heat losses and incorrect use of the thermometer.

 

[faisalabdul16]

Also multiple choice solutions (almost 100% sure these are correct):
1: D
2: A
3: B
4: C
5: C
6: B
7: C
8: C
9: A
10: C
11: A
12: C
13: B
14: D
15: D
16: B
17: A
18: D
19: B
20: D

8 is B, read the question. I also fell for it

 

[bio4lyf]

the sulphate, chloride and carbonate question was to do with solubility rules rite???

 

[SuchSmallHands]

lol yeah that was me, I had like 45 minutes to do all of chem of art and all of multiple choice. That actually seems pretty legit haha. Where did the hydrogen come from though? I had an ammonium vanadate prac thingy as it changes oxidation state

I did the zinc/chromium one. I didn't even have time to write a reaction equation but I do remember that hydrogen gas was evolved. 7 marker I only wrote one page, I'm so screwed holy shit. Hopefully chem of art aligns/moderates/whatever it is well because I screwed it pretty bad in some places. I wrote way too much for the core and then had no time for it...

 

[faisalabdul16]

The key thing (again), was not to identify the trend, but to show that it achieved the aim; hence at least partially valid. The validity was compromised by the heat losses and incorrect use of the thermometer.

Yes i agree! you had to talk about how aspects of the experiment was valid and not valid. You had to talk about experimental method/ trends and the stuff you mentioned previously

 

[bhatman]

are you sure about question 8?

oh dang, just realised I dun goofed
should be B then

 

[photastic]

Can someone explain why Q8 is B?

 

[IR]

The key thing (again), was not to identify the trend, but to show that it achieved the aim; hence at least partially valid. The validity was compromised by the heat losses and incorrect use of the thermometer.

That linking still should not be More than one mark?

 

[bhatman]

the sulphate, chloride and carbonate question was to do with solubility rules rite???

That was in the anion testing dot point. For carbonate you add nitric acid and you produce CO2 gas as a product indicating the presence of carbonate ions. Sulfate you acidify the sample with HNO3 and add Ba(NO3)2, giving precipitate of BaSO4 and thereby indicating SO4- is present. For chloride, you again acidify with HNO3 and add AgNO3, to precipitate silver chloride. Didn't need to know solubility rules if you had the flow chart of anion testing memorised or at least knew what to do to identify these ions in a sample.

 

[bio4lyf]

No.. chemical monitoring and management m8

the cation and anion thing from chem monitoring and manangement rite??? coz thats wat i rote!!!

 

[bhatman]

Praying to the BOSTES gods that they mark my paper as nicely as my school teachers did my trials

 

[Cleverusername5321]

I FUCKING lost 3 marks on multiple choice. Question 7, 13 and 20. The only legit mark I should have lost was maybe question 13. I'm fucking retarded, I had 5 minutes left over and didn't use that time to check the answers.

 

[bio4lyf]

That was in the anion testing dot point. For carbonate you add nitric acid and you produce CO2 gas as a product indicating the presence of carbonate ions. Sulfate you acidify the sample with HNO3 and add Ba(NO3)2, giving precipitate of BaSO4 and thereby indicating SO4- is present. For chloride, you again acidify with HNO3 and add AgNO3, to precipitate silver chloride. Didn't need to know solubility rules if you had the flow chart of anion testing memorised or at least knew what to do to identify these ions in a sample.

yeah okie thanx thats what i wrote!

 

[SuchSmallHands]

Yeah that was me :/ deep regrets at some points in core I wrote like 2 pages for a 3 marker, no wonder I couldn't finish the paper. The last 45 minutes were stressful as hell, and then I come out of the exam and everyone was like "omg it was so good! I finished an hour early!"...

Argh me too, I wrote down the margins for two markers (the supervisers were taking too long to keep getting booklets, and wouldn't just give me a stack at a time smh), so stupid. Then I wrote two extra pages on ethanol and didn't even answer the question fully so good on me.

 

[enigma_1]

also probably had to add something about how you're testing the next sample on the filtrate from the previous one, and how co2 must be destroyed after testing by adding excess hno3, because the question did say "in a sequence"

This and also include the confirmation tests perhaps

 

[Cleverusername5321]

What was the answer to the first question in the core on nuclear chemistry? That was another gem.

 

[photastic]

After the exam: Pretty Good
After Boredofstudies: FML

Lost 20 marks after looking at this

 

[SuchSmallHands]

omg that question was annoying as because it said include "one" chemical equation. And I wanted to include so many more i cri haha

I included all of them, it's not like they'll deduct marks. I didn't see the 'in a sequence' part though, so sad right now. I was thinking there wasn't much work for 5 marks there!

 

[bhatman]

omg that question was annoying as because it said include "one" chemical equation. And I wanted to include so many more i cri haha

BOSTES taking the piss when they said ONE