OCR GCSE Combined Science A (Gateway) Chemistry Paper 3 Foundation June 2025 mark scheme J250/03
Practise the past exam questions by topic
Three states of matter46 Qs
Conservation of mass & balanced equations52 Qs
Oxidation & reduction in terms of electrons21 Qs
Chromatography11 Qs
Reactions of acids22 Qs
Pure substances9 Qs
Subatomic particles26 Qs
Metals & non-metals9 Qs
Exothermic & endothermic reactions9 Qs
Reaction profiles10 Qs
Chemical bonds26 Qs
Electrolysis10 Qs
Ionic bonding & ionic compounds10 Qs
Empirical formulae10 Qs
Relative formula mass17 Qs
Mixtures & separation techniques12 Qs
PH scale & neutralisation16 Qs
+13 more
15 questions
- Q1 - 1 mark - The three states of matter
- Q2 - 1 mark - Conservation of mass and balanced equations
- Q3 - 1 mark - The three states of matter
- Q4 - 1 mark - Conservation of mass and balanced equations
- Q5 - 1 mark - Oxidation and reduction in terms of electrons
- Q6 - 1 mark - Chromatography
- Q7 - 1 mark - Reactions of acids
- Q8 - 1 mark - The three states of matter
- Q9 - 1 mark - Pure substances
- Q10 - 1 mark - Subatomic particles
- Q11 - 5 marks - Metals and non-metals
- Q12 - 5 marks - Exothermic and endothermic reactions, Reaction profiles
- Q13 - 15 marks - Chemical bonds, Electrolysis, Ionic bonding and ionic compounds, The three states of matter
- Q14 - 13 marks - Chemical bonds, Conservation of mass and balanced equations, Empirical formulae, Relative formula mass, Subatomic particles
- Q15 - 12 marks - Mixtures and separation techniques, Reactions of acids, The pH scale and neutralisation
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