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19th May 2016 - OCR 21st Century Science C1 C2 C3 Exam

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One wet scrubbing method:
- alkaline slurry. Calcium oxide and water make calcium sulphate (aka gypsum) which is sold as plaster

Reply 41

username1454260

Original post by stitch1212

1st question and im already stumped xD not looking great...

Haahh don't worry :smile:

I'll answer them all in half an hour if no one else does, then you'll know :tongue:

Reply 42

stitch1212

see its that awkward moment when you usually just BS your way through the questions you dont know for one mark hopefully but you dont feel comfortable doing that online for every way to think your incompetent xD

Reply 43

11207ymir

Original post by Ella_08

Good predictions, I agree with them all.

I hope that the evolution of the earths atmosphere come up as a 6 marker even though it came up last year!

Reply 44

Usmaan345

Can you go all over c1 c2 and c3 with us

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Reply 45

username1454260

Original post by 11207ymir

I hope that the evolution of the earths atmosphere come up as a 6 marker even though it came up last year!

Ikr! although I doubt it will, they don't usually repeat 6 markers from the previous year :/

Reply 46

louisemayorx

Original post by Ella_08

Yeah sure, I am. Let's ask each other loads of questions and then someone should answer it. First question: Why might synthetic materials be better than natural materials?

as synthetic materials are sometimes more durable and effective in their purpose? i'm not sure, that's what i would write in the exam :/

Reply 47

username1454260

Does anyone want me to just post random facts?

Reply 48

tasnia25

Can someone summarise what may come up in the exam?

Reply 49

stitch1212

Original post by Ella_08

Does anyone want me to just post random facts?

YES?!?!?

Reply 50

Usmaan345

Ella can you start from c1 please

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Reply 51

JNota

I Predict:
-Crude Oil
-Emulsions
-Cracking
-Polymers
-Limestone
-Biofuels

Reply 52

Sum Ting

What would you need to know about limestone?

Reply 53

stitch1212

Original post by Sum Ting

What would you need to know about limestone?

i agree what does everyone mean by limestone???

Reply 54

thatonepunkguy

I'm so bloody nervous about this exam! I've been pretty calm about my exams so far despite being a nervy person but I had a panic attack earlier thinking about tomorrow, it wasn't pleasant. Does anyone have any good notes? I've read over my revision guide and made mindmaps and put quite a few hours in but I'm still not feeling all that confident, especially on C2 and 3.

Reply 55

Sum Ting

Original post by thatonepunkguy

These notes are quite detailed, should help you out

C1- Air Quality.docx34.7KB

C2-Material Choices.docx114.1KB

C3- Chemicals in our lives.docx41.6KB

Reply 56

thatonepunkguy

Original post by stitch1212

i agree what does everyone mean by limestone???

All my revision guide says about limestone is that along with coal and salt, it's a very valuable mineral deposit and that deposits of these minerals are found in North West England. While not in the revision guide, with some research I found out limestone is used to neutralise excess acidity, that it can be used as a building material, that it can be used to purify iron in blast furnaces and it's also used in the manufacturing of glass and cement.

(edited 7 years ago)

Reply 57

Jakir

Original post by louisemayorx

if it's no trouble, does anyone have the C123 2015 paper? I haven't seen it and since it's most recent to the exam tomorrow I think it would be extremely helpful!