AQA GCSE Chemistry Paper 1 8462 Higher - 16 May 2019 Unofficial Markscheme

Why aluminium oxide is a mixture one I said how it’s melting point is way too high so it needs to be a mixture to lower it

Catalyst was magnesium oxide
one of the answers were Equation 2 because moles were both 0.04
i got mass of oxygen to be 144kg
polysterene cup is used to prevent heat escaping

what wud u say grade boundaries would be someone plz make a good estimate

I got 941kg on the 2000kg Aluminium Oxide question and -1002 on the bond energy

What did everyone get for the standard form question

i thought the catalyst was chromium because chromium is a transition metal that has the properties for a catalyst.

-1200 ish (cant remember the exact number) on the bond energies. And i got 200kg ish for the mass of oxygen however i am not confident

-1272 maybe?

-1272 maybe?

I got -1272 too. I think they made a printing error as they should've put kj /mol not kj.

The bond energy was -1272(If I remeber correctly)
Last question was 0.62 and 34.72
The graph question (where they crossed) was like 11.5
Mass of oxygen was 941.17.....(round if needed but the question didn’t state to do so)
The standard form was 4.0344x10^4
The volume of gas was around 50 something

Think that’s all the maths questions

How do you work out the volume of gas?

I got 941kg on the 2000kg Aluminium Oxide question and -1002 on the bond energy

For the last question I got 0.62 mol/dm^3 and 69.44 g/dm^3 for the last question, but the second one is wrong

The bond energy was -1272(If I remeber correctly)
Last question was 0.62 and 34.72
The graph question (where they crossed) was like 11.5
Mass of oxygen was 941.17.....(round if needed but the question didn’t state to do so)
The standard form was 4.0344x10^4
The volume of gas was around 50 something

Think that’s all the maths questions