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

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ettamagill
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Post your answers for questions for TRIPLE AQA from today x
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username3829122
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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
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meriem_ait
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For the bond energy one (higher tier) I got -2... something lol can’t remembrr
(Original post by ettamagill)
Post your answers for questions for TRIPLE AQA from today x
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meriem_ait
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I got 0.62 mol too!
(Original post by mosquito1234)
For the last question I got 0.62 mol/dm^3 and 68.44 g/dm^3 for the last question, but the second one is wrong
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meriem_ait
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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
(Original post by ettamagill)
Post your answers for questions for TRIPLE AQA from today x
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ettamagill
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For the 6mark question on the back I got 0.62 mol/dm3 and then 34.72g/dm3
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nabihaa
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I got 0.62 and then 34.72 for the second one
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kandy1023
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what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode
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meriem_ait
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Same
(Original post by nabihaa)
I got 0.62 and then 34.72 for the second one
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nabihaa
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what was the reason for it being an exothermic reaction, I put the energy used to make bonds was greater than the energy released
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tanyapriya
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how did everyone find it ???
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meriem_ait
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Yh that’s what I said and how the anode is made up of carbon which would react With oxygen to make carbon dioxiede
(Original post by kandy1023)
what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode
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meriem_ait
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Good! A lot of ppl came out saying it was hard thou
(Original post by tanyapriya)
how did everyone find it ???
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meriem_ait
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Yh same
(Original post by nabihaa)
what was the reason for it being an exothermic reaction, I put the energy used to make bonds was greater than the energy released
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Jmander
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Said the same thing
(Original post by kandy1023)
what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode
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daeho14
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(Original post by nabihaa)
what was the reason for it being an exothermic reaction, I put the energy used to make bonds was greater than the energy released
That’s what I put as well but I put greater than the energy used to break bonds in the reactants
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Ddfvbjjjhgvvh
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#17
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I got 0.617777777 so did u lot just round to 6.2
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Evil Homer
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Hope the exam went well!
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charlieost
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#19
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-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
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ridaax
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(Original post by kandy1023)
what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode
Because it’s made of graphite which is a form of carbon and it reacts with oxygen to form carbon dioxide
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