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IAL Chemistry Unit 4 Jan 2018

I didn’t see a thread for this so here y’all go. How was it? (Edexcel)

Update: I got hold of the paper just recently, so if anyone wants it just email me your email addresses and I’ll be glad to send it to you.

(edited 6 years ago)

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Reply 1

MrRJ

How did answer the 6 mark question about determining the rate of reaction?

Reply 2

a271999

What u think the grade boundary is gonna be for an a*??

Reply 3

a271999

Original post by MrRJ

How did answer the 6 mark question about determining the rate of reaction?

u had to quench then titrate with an acid at different times and draw conc/time graph to get the rate from the gradient.

Reply 4

bfis

what were the answers for mcqs? i wanna know whether most of mine turned out right or not

Reply 5

bfis

Original post by a271999

What u think the grade boundary is gonna be for an a*??

I think they may be high. They usually always are, but since I feel like this paper wasn't all that hard, it might be high. A lot of my friends did really well. :frown:

Worst exam ever.

Guys what was the order of reaction that you got?

Reply 8

funkypineapple

Original post by Aima qureshi

Worst exam ever.

Same

What did you guys get for kc ?

Reply 9

Rockitty99

Original post by bfis

I think they may be high. They usually always are, but since I feel like this paper wasn't all that hard, it might be high. A lot of my friends did really well. :frown:

I agree with this. I found the exam really easy too and so did my friends. I hope they’re not really really high though

Reply 10

a271999

Original post by funkypineapple

Same

What did you guys get for kc ?

4.25....

Reply 11

Rockitty99

Original post by funkypineapple

Same

What did you guys get for kc ?

I got 4.82

Original post by Aima qureshi

Guys what was the order of reaction that you got?

I got r=k[halogenoalkane], dunno if it’s correct or not as some said NaOH was there and some said it wasn’t

And what did y’all write for ethanol being used instead of water?.

Reply 12

Bebou

What did u guys get for the rate equation and rate constant?
I got first order for the halogenoalkane

Reply 13

bfis

Original post by Bebou

What did u guys get for the rate equation and rate constant?
I got first order for the halogenoalkane

right? I got first order too, but so many of my friends told me that it was wrong. If it does turn out wrong, will we have error carried forward for it? :frown:

Guys, for the 6 mark question regarding finding the rate, I said measure at 2 minute intervals but didn't state for how long like 10 minutes for example, and said rate would be of mass of ppt (cuz I used AgNO3 addition to C4H9Br) not change of mass...I'm just worried that they would reject that cuz I remember I've seen them reject that before..making me lose all 6 marks..what do u guys think?

Reply 16

Sam19KY

What did you guys get for the rate constant value in section c ? did you use the volumes of the solutions in your calculation or the volume of each reactant divided by the volume of the whole reaction mixture ?

Reply 17

The Korean girl

Original post by a271999

4.25....

we're on the same boat, I got 4.25 too!!!!

Reply 18

The Korean girl

Original post by bfis

right? I got first order too, but so many of my friends told me that it was wrong. If it does turn out wrong, will we have error carried forward for it? :frown:

No worries, it is first order ^^
so the rate equation is
rate= k [C5H9Br]

also, the reaction is Sn1, as only 1 specie is involved in the RDS

Reply 19

The Korean girl

Original post by Rockitty99

I got 4.82

I got r=k[halogenoalkane], dunno if it’s correct or not as some said NaOH was there and some said it wasn’t

And what did y’all write for ethanol being used instead of water?.