Chemistry Predictions/Thoughts (6 Viewers)

[almost_done]

It doesn't change KEQ because KEQ is only changed by Temperature.
In the system however it is still dynamic equilibrium, by adding Argon it increases the pressure of the system and causes it to shift towards the right.

yeah thats what i thought? why are people saying it doesnt change the temp... its 4 marks, clearly they wanted some explanation

 

[dubbatee]

You're determining the concentration of silver ions though, aren't you?

Yeah thats why I think its sort of odd. Either way, if we had the silver ions in the conical flask with the indicator, then the silver ions would just form a precipitate with the dichromate. Then, our burette would have the Cl- ions, which wouldnt really make sense. The dichromate is in a very small quantity, so only a very small amount of AgCr2O4 has been produced. Hence, as we add, say 10mL of our Cl- solution, there might not be a very defined colour change, since our indicator has already been consumed. I think it would be a very bad titration, but I agree that the question makes it seem like this.

 

[thatnerdyhylian]

Yeah thats why I think its sort of odd. Either way, if we had the silver ions in the conical flask with the indicator, then the silver ions would just form a precipitate with the dichromate. Then, our burette would have the Cl- ions, which wouldnt really make sense. The dichromate is in a very small quantity, so only a very small amount of AgCr2O4 has been produced. Hence, as we add, say 10mL of our Cl- solution, there might not be a very defined colour change, since our indicator has already been consumed. I think it would be a very bad titration, but I agree that the question makes it seem like this.

Thanks

I was confused because I had thought silver chromate would form a complex (and not precipitate), which meant it would be fine to go in the flask. I've no idea why I assumed this.

 

[Wildhalberd]

Harder or easier than 2024?

 

[lolcti]

Harder or easier than 2024?

Equal to

 

[eternallyboreduser]

Harder or easier than 2024?

harder mcq was way harder and the explanation qs in 2024 wad way eadier

 

[dubbatee]

Thanks

I was confused because I had thought silver chromate would form a complex (and not precipitate), which meant it would be fine to go in the flask. I've no idea why I assumed this.

Its honestly a really niche topic, I didn't think they would test precipitation titration because I dont think I actually learned it in class when i did chem last year

 

[lolcti]

Its honestly a really niche topic, I didn't think they would test precipitation titration because I dont think I actually learned it in class when i did chem last year

Same

 

[nowomansland]

Its honestly a really niche topic, I didn't think they would test precipitation titration because I dont think I actually learned it in class when i did chem last year

i was lowk expecting them to give a big precipitation titration instead of back titration to throw everyone off

 

[nowomansland]

BBAACDDDADABCBDAABCB I think

(Edited: I had put 18 as A and was corrected)

why is 7 D? shouldnt it be UV-Vis?

 

[tsswhzl]

why is 7 D? shouldnt it be UV-Vis?

Yeah

 

[academicalwizard101]

I think for the argon gas question they will award marks to both cases.
Its cruel to be misleading us with the temperature and making it 4 marks.
At least make the question: Will equillibrium shift when argon gas is added? 2 marks -this will make students actually think

 

[TJ_Cool01]

I think for the argon gas question they will award marks to both cases.
Its cruel to be misleading us with the temperature and making it 4 marks.
At least make the question: Will equillibrium shift when argon gas is added? 2 marks -this will make students actually think

I really really hope so, worst case surely they give 2mks for the "wrong" one?

 

[nowomansland]

I think for the argon gas question they will award marks to both cases.
Its cruel to be misleading us with the temperature and making it 4 marks.
At least make the question: Will equillibrium shift when argon gas is added? 2 marks -this will make students actually think

yeah asking about temp made me assume there would be a change in temp

 

[tsswhzl]

BBAACDDDADABCBDAABCB I think

(Edited: I had put 18 as A and was corrected)

Why would question 1 be B it seems to be concentrated and strong

 

[nowomansland]

Why would question 1 be B it seems to be concentrated and strong

bc there were only 4 ions w a lot of gap in between so it would be dilute

 

[catie_mc1237]

guys i’m dying can someone please send all the answers it’s too stressful

 

[academicalwizard101]

I really really hope so, worst case surely they give 2mks for the "wrong" one?

yeah asking about temp made me assume there would be a change in temp

they better award marks then it would genuinely be unfair to the students who were taught that argon gas does shift eq

 

[tywebb]

catalyst sols attached

 

[BionicMango]

this test was so fucking hard. 2024 asked surface level questions i could've scraped a band 4 with

pH of NaOH is 13, so adding it to acid means it will never go above 13, it will decrease.