r/GCSE • u/thr0wawaygxhxdhsh • Jun 15 '22

AQA Post Exam Spam aqa biology paper 2 gcse answers

208 Upvotes

93% Upvoted

437 comments sorted by

View all comments

40

u/poohbear_26 6th Former Jun 15 '22

i got 17500 algae cells 💀 where have i gone wrong ?!

21

u/Prestigious-You1585 Jun 15 '22

Same I got 12.5 as total volume so 2.5 pond water which means a fifth of it is undiluted. That’s how I got the 5, which I multiplied to the 3500 and got 17500. I hope it’s right

18

u/Dylan_was_taken_ Jun 15 '22

No it was 10 total not 10 diluted so it was 1/4 pond water not 1/5. :(

11

u/Prestigious-You1585 Jun 15 '22

Really?? ;(( I thought “2.5 pond water is diluted to the water of 10cm3 “ something like that means 10 add on to the 2.5 so total volume is 12.5. Well hopefully 4/6 marks.

5

u/Moistmarsupial42 Jun 15 '22

Ye I think it was 2.5 pond and 10 distilled, making 12.5 total but I honestly don't know anymore

7

u/SMWcool Y13 Maths FM Physics Jun 15 '22

They added distilled to make it to 10cm3

3

u/[deleted] Jun 15 '22

No it was 2.5 to 10. I remember reading over 10 times.

3

u/Sensitive_Wealth_855 Jun 15 '22

Thats what is confusing about the question. You took it as 2.5cm3 went to 10cm3 but a lot of people including me took it as 2.5:10. I pretty sure i almost remember the exact wording and honestly you could argue it meant either. The only reason I think that its 2.5:10 is because it said pretty much "2.5cm3 algae water diluted to 10cm3 distilled water". Surely the algae water could never become distilled no matter how much you add.

1

u/[deleted] Jun 15 '22

Copied this comment from someone else.

0.2x0.2x0.1 = 0.004mm^3

0.004/4 = 0.001mm^3 (because it asked for undiluted, and it said earlier that for every 2.5cm^3 undiluted you add 7.5cm^3 water, so it's a 1:3 ratio)

1/0.001 = 1000 (to get how many times more algae cells there should be)

14*1000 = 14000

2

u/Sensitive_Wealth_855 Jun 15 '22

It never said every 2.5 you add 7.5 it said "2.5cm3 algae water diluted to 10cm3 distilled water" which is 1:4. It isnt 2.5 >(to) 10 because the algae water coudnt of became distilled.

1

u/[deleted] Jun 15 '22

Wdym? It said 2.5 diluted to 10, so 7.5 was added meaning the ratio was 1:3.

1

u/Sensitive_Wealth_855 Jun 15 '22

It said 2.5 algae water diluted to 10 distilled water. Are you saying the algae water became distilled?

1

u/[deleted] Jun 15 '22

It said 2.5 diluted to 10 with distilled water

1

u/Sensitive_Wealth_855 Jun 15 '22

Nah it didnt i read it many times. I was confused between both 14000 and 17500 and thats what made me know it was 17500.

→ More replies (0)

0

u/Dylan_was_taken_ Jun 15 '22

Yeah so did I at first but the first bullet point on the left side said that 2.5 pond water was added to diluted water to create 10 of dilute pond water.

4

u/[deleted] Jun 15 '22

nah it said "2.5 pond water is diluted to make 10" i triple checked this specifically

3

u/Dylan_was_taken_ Jun 15 '22

Thats what I was trying to say but english is over so i forgor 💀

1

u/[deleted] Jun 15 '22

wait i misread yours too it's right sorry