AS & A Level · Cambridge 9701

Chemistry 9701

5,719 practice questions with worked solutions, organised by topic and past-paper session. Practise any question and get your answer marked instantly.

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Atomic structureAtoms, molecules and stoichiometryChemical bondingStates of matterChemical energeticsElectrochemistryEquilibriaReaction kineticsThe Periodic Table: chemical periodicityGroup 2Group 17Nitrogen and sulfurAn introduction to AS Level organic chemistryHydrocarbonsHalogen compoundsHydroxy compoundsCarbonyl compoundsCarboxylic acids and derivativesNitrogen compoundsPolymerisationOrganic synthesisAnalytical techniquesChemical energeticsElectrochemistryEquilibriaReaction kineticsGroup 2Chemistry of transition elementsAn introduction to A Level organic chemistryHydrocarbonsHalogen compoundsHydroxy compoundsCarboxylic acids and derivativesNitrogen compoundsPolymerisationOrganic synthesisAnalytical techniques

By past paper

Feb/March 2018Feb/March 2017Feb/March 2016

Example questions

Which compound contains two different elements that have the same oxidation state?

Atoms, molecules and stoichiometry · Feb/March 2016

Which equation shows a reaction enthalpy that is equal to the standard enthalpy change of atomisation of chlorine?

Chemical energetics · Feb/March 2016

During an experiment, $2.00\ \text{mol}$ of hydrogen and $3.00\ \text{mol}$ of iodine were placed in a sealed container, then heated so that the reaction could reach equilibrium at a constant temperature. The container volume was kept at $1.00\ \text{dm}^3$. When equilibrium was reached, the mixture contained $2.40\ \text{mol}$ of iodine. $\text{H}_2\text{(g)} + \text{I}_2\text{(g)} \rightleftharpoons 2\text{HI(g)}$ Calculate the value of the equilibrium constant, $K_c$?

Equilibria · Feb/March 2016

The consecutive elements X, Y and Z are all in Period 3 of the Periodic Table. Of these three elements, Y has the greatest first ionisation energy and the smallest melting point. What are the identities of X, Y and Z?

The Periodic Table: chemical periodicity · Feb/March 2016

When a spillage of metallic sodium is being dealt with, it is important that no toxic or flammable products are produced. Which material should be used if metallic sodium is spilled?

The Periodic Table: chemical periodicity · Feb/March 2016

Chlorine gas is commonly used to disinfect polluted water. Which species in the water after chlorine gas has been added is responsible for killing bacteria?

Equilibria · Feb/March 2016

Which line in the table is correct?

Chemical bonding · Feb/March 2016

Hydrogen chloride gas and hydrogen iodide gas do not have the same thermal stability. This difference arises because some of the covalent bonds involved in decomposition have different bond energies. Which row identifies which of the two compounds is the more stable, and provides the correct reason?

Group 17 · Feb/March 2016

Ammonium sulfate, $(\text{NH}_4)_2\text{SO}_4$, together with ammonium nitrate, $\text{NH}_4\text{NO}_3$, are employed as fertilisers. The percentage by mass of nitrogen is different in these salts. Each has the same effect as the other on the pH of neutral soil. Which row is the correct one?

Atoms, molecules and stoichiometry · Feb/March 2016

River water from a chalk-rich agricultural region contains $\text{Ca}^{2+}$, $\text{Mg}^{2+}$, $\text{CO}_3^{2-}$, $\text{HCO}_3^-$, $\text{Cl}^-$ and $\text{NO}_3^-\,$ ions. At a water treatment plant, this water is processed by adding a calculated amount of calcium hydroxide. Which substances will precipitate from the river water after the calcium hydroxide has been added?

Equilibria · Feb/March 2016