AS & A Level Chemistry (9701) — May–June 2025, Paper 44
8 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Group 2 carbonates decompose on heating. (i) State and explain the trend in the thermal stability of Group 2 carbonates as the group is descended. (ii) Write the equation for the…
Answer this question and get it marked →Nitrogen triiodide, NI3, decomposes explosively. 2NI3(s) → N2(g) + 3I2(g) (i) Describe the observation when NI3 is heated. (ii) Define the term entropy. (iii) Explain why the…
Answer this question and get it marked →Nickel iodate, Ni(IO3)2, is a sparingly soluble salt. (i) Write an expression for Ksp of Ni(IO3)2. State the units of Ksp. (ii) The solubility of Ni(IO3)2 is 2.30×10⁻² mol dm⁻³.…
Answer this question and get it marked →Three polymers X, Y and Z are made from the following monomers. Monomer for X: H₂N(CH₂)₅CO₂H Monomer for Y: CH₂=CHCO₂CH₃ Monomers for Z: CH₃CH(OH)CO₂H (a) For each polymer, state…
Answer this question and get it marked →Atorvastatin is a drug with the molecular formula C₃₃H₃₅FN₂O₅. Its structure includes an amide group, two OH groups, an NH group, an alkene, and a fluorine-substituted aromatic…
Answer this question and get it marked →Lavandulol (compound A, C₁₀H₁₈O) is a natural product found in lavender. It contains an alcohol group and two carbon–carbon double bonds. Compound A undergoes a series of…
Answer this question and get it marked →Benzoic acid, phenol and ethanol are three organic compounds. State and explain their relative acidities. Write equations to support your answer.
Answer this question and get it marked →(i) Define the term lattice energy. (ii) Define the term standard enthalpy change of solution, ΔHsol⦵.
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