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AQA Chemistry GCSE C1 Higher - Unofficial Mark Scheme Period.

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Reply 60

Merin123

If I got an a for all my exams but got an a star for my isa what grade do I get

Reply 61

anaryanstark

Did the last question have 4 marks? Did anyone say that the hydrophilic heads of the molecule repelled each other, keeping the oil molecules evenly dispersed throughout the emulsion?

Reply 62

R7499

Any ideas of grade boundaries?

Reply 63

Callnitram

i got like 52 whats that

Reply 64

Mynigga69

Original post by Merin123

If I got an a for all my exams but got an a star for my isa what grade do I get

You would most likely get a high A but could sneak an A*

Reply 65

Lola1244

for the accuracy one could you have put to repeat it for each value and then take an average or is that not right?

Reply 66

Callnitram

Original post by hope99

Thanks for the markscheme, but where did you get these answers from? I'm not sure about a few eg for the cast iron one,i think the question was about why isn't cast iron used for pylons not cables, but anyway i don't think it's too soft like you said because it's cast iron not pure iron; pure iron would be too soft but cast iron is brittle, so maybe that's why?

No there was a separate question on cast iron for pylons and Aluminium instead of copper for overhead wires!

Reply 67

Mynigga69

Original post by Callnitram

i got like 52 whats that

I think anything above 47 should be an A*. By that standard, you should get about 95-97 UMS marks

Reply 68

Lola1244

also would a property be changing shape in different conditions or does it have to be shape memory

Reply 69

2spooky4AQA

Got 42 according to this. A or B? thks

Reply 70

Hermione118

Original post by metrize

Wasnt the element oxygen

No, I wrote that to start with. The MASS number of oxygen is 16 and the atomic number of sulfur is 16. You needed to look at the atomic number, not the mass number.

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Reply 71

tibz101

I thought the element on page 2 was oxygen as ut had 16 electrons?

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Reply 72

tibz101

Original post by 2spooky4AQA

Got 42 according to this. A or B? thks

That's an A, I believe. Good job!

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Reply 73

Hriz23

Thank you so much! You forgot one question though OP, it said how can copper be extracted using iron or something (right after the question about aluminum and copper's place on periodic table and how we can tell it's transition metal), and if I am correct the right answer is because iron is more reactive than copper so displacement would happen! Add that and you have got everything

Reply 74

tibz101

For the 'why is thrre no overall charge?' question, I put that protons have a +1 charge and neutrons have no charge but electrons have a -1 charge so these cancel eachother out?

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Reply 75

Visha99

Got a 56 is that defo an A*?

Reply 76

Visha99

Original post by tibz101

I wrote that its because atoms have the same number of protons(+) and electrons (-) so they cancel each ithers charge out causing the atom to have no overall charge.