AS & A Level Chemistry (9701) — May–June 2025, Paper 21
6 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 11 marks · Chemical bonding: metallic bonding; ionic bonding
(i) Name the type of bonding in sodium. Name the type of bonding in sodium oxide. (ii) Explain how solid sodium conducts electricity. (iii) Explain why sodium oxide conducts…
Answer this question and get it marked →Question 2 · 11 marks · Atomic structure: isotopes
Define the term isotopes.
Answer this question and get it marked →Question 3 · 10 marks · Reaction kinetics: Boltzmann distribution; catalysis
(i) On the axes of Fig. 3.1, sketch the Boltzmann distribution of molecular energies for H2 at a higher temperature than T. (ii) Explain why increasing temperature increases the…
Answer this question and get it marked →Question 4 · 9 marks · Atoms, molecules and stoichiometry: empirical formula
Deduce the empirical formula of vitamin C (molecular formula C6H8O6).
Answer this question and get it marked →Question 5 · 12 marks · Organic chemistry: esters; hydrolysis
Draw the structure of compound A (which hydrolyses to give malonic acid HOOCCH2COOH and 2 mol ethanol CH3CH2OH).
Answer this question and get it marked →Question 6 · 7 marks · Organic chemistry: carbonyl compounds; functional groups
State the functional group in ethanal, propanal and propanone.
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