AQA GCSE Chemistry Paper 1 unofficial mark scheme [COMPILED]

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ZdYnm8vuNR
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(The answers here are collected from this thread: https://www.thestudentroom.co.uk/sho....php?t=5370688)

What can make soluble salts question:
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Metal Hydroxide / Metal Carbonate

6 Marker on making Magnesium Sulfate salt:
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- put some dilute sulfuric acid into a beaker
- heat it gently under a bunsen burner and add magnesium oxide in excess
- filter to remove unreacted magnesium oxide
- heat the rest of the solution so half of it evaporates
- put into a crystallising dish and allow to cool and crystallise for 24 hours.
- dry crystals with filter paper
- wear eye protection around chemicals

Balancing the reaction in a hydrogen fuel cell:
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2H2 + O2 -> 2H20

Calcium Charge:
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Ca(NO3)2

Bond Energy Question:
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290

pH Question:
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5.0 (decreased by a factor of 100, ph increases from 3 to 5)

Iron/Sulfur Fórmula Question:
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FeS2

Unknown concentration in titration question:
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Sodium Hydroxide: 0.105 mol/dm^3
Titrations: 22.10, 22.15, 22.15
Mean titre= 22.13(r)

2NaOH + H2SO4 -> Na2SO4 + 2H20

Mol (NaOH)= (22.13(r)*0.105)/1000 = 2.324*10-3
Ratio Alkali: Acid = 2:1

Mol (H2S04)= (2.324*10^-3)/2 = 1.162*10-3 mol
Conc (H2S04) = ((1.162*10^-3)/25)*1000= 0.04648 mol/dm^3
= 0.465 mol/dm^3 (sfg in accordance to the lowest sfg given in question stem)

Problem in electrolosys apparatus:
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Need a gas syringe to measure the volume of the gas produced

Atom Economy Question:
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67.8%


Feel free to comment on any edits I need to do or to add any question answers
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Lemur14
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Hi there :wavey:
I've moved your thread to the Chemistry Exams forum where hopefully you'll get more answers In future, it's best to select the subject from the list here and create a thread in there instead :yep: If you want to see where threads belong, check out this thread
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Florina12345
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is this the paper 1 higher from may 2018? or triple
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XiuYee
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(Original post by Florina12345)
is this the paper 1 higher from may 2018? or triple
This is for the AQA GCSE Chemistry Paper 1, it's an unofficial Mark scheme. It's Higher.
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goodgrades24
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(Original post by XiuYee)
This is for the AQA GCSE Chemistry Paper 1, it's an unofficial Mark scheme. It's Higher.
is this for triple or core science?
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XiuYee
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(Original post by goodgrades24)
is this for triple or core science?
Triple, I had the test today as part of a mock. It was correct and I'm a higher student
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2003hannah
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(Original post by XiuYee)
Triple, I had the test today as part of a mock. It was correct and I'm a higher student
Did anything else come up?
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s22996
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have you got more question on chemistry paper1?
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mansi.see
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(Original post by XiuYee)
Triple, I had the test today as part of a mock. It was correct and I'm a higher student
is this all you had on the test?
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appleuser12
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Wait is this core science or triple science ??? Can someone clarify please!
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2003hannah
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Triple
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fGCSEcba
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(Original post by appleuser12)
Wait is this core science or triple science ??? Can someone clarify please!
tripple science is when you do the seperate sciences and are given 3 seperate GCSEs for double is just the normal one
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appleuser12
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(Original post by fGCSEcba)
tripple science is when you do the seperate sciences and are given 3 seperate GCSEs for double is just the normal one
wait so this test is people who are doing triple right ???
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fGCSEcba
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(Original post by appleuser12)
wait so this test is people who are doing triple right ???
just tripple, im doing it tomorrow
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Mosty
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Is that all the questions ?
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