AQA GCSE Combined Science Chemistry – Paper 2 Higher Tier Predicted Paper may 2023 attached with marking scheme

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GCSE Combined Science
AQA
Chemistry – Paper 2
Higher Tier
Predicted Paper 2023


Name ……………………………………………………………………
Date …………………


1 hour 15 minutes allowed.
You may use a calculator and an AQA periodic table.




Grade boundaries Possible Marks
Question
marks gained
These are VERY rough guesses! Getting a 1 13
7 on this paper does not guarantee you 2 17
the same mark in the exam. 3 15
4 12
5 13
 9-9 70% Total 70
 8-8 60%
 7-7 50%
 6-6 45%
 5-5 35%
 4-4 30%




[Type text]

,chem



01
a) Alkanes are hydrocarbons.
Define the term hydrocarbon.
[2 marks]




b) The general formula for alkanes is CnH2n+2,

i. Give the formula for an alkane that has 3 carbons.
[1 mark]


C H




ii. Give the specific name for this alkane.
[1 mark]




iii. Draw this alkane.
[3 marks]




C C C




[Type text]

, chem



c) Alkanes are often very long chains; these are found in the ground
as crude oil. Crude oil is a mixture of different length hydrocarbon
chains.

Explain why crude oil needs to be refined before it can be used.
[3 marks]




d) A student said that “fractional distillation can be used to separate all
types of mixtures”.

Discuss if this student is correct or not.
[3 marks]




[Type text]