O Level · Cambridge 5070

Chemistry 5070

2,317 practice questions with worked solutions, organised by topic and past-paper session. Practise any question and get your answer marked instantly.

Practise by topic

States of matter Solids, liquids and gases Diffusion Atoms, elements and compounds Elements, compounds and mixtures Atomic structure and the Periodic Table Isotopes Ion and ionic bonds Simple molecules and covalent bonds Giant covalent structures Metallic bonding Stoichiometry Formulae Relative masses of atoms and molecules The mole and the Avogadro constant Electrochemistry Electrolysis Hydrogen–oxygen fuel cells Chemical energetics Exothermic and endothermic reactions Chemical reactions Physical and chemical changes Rate of reaction Reversible reactions and equilibrium Redox Acids, bases and salts The characteristic properties of acids and bases Oxides Preparation of salts The Periodic Table Arrangement of elements Group I properties Group VII properties Transition elements Noble gases Metals Properties of metals Uses of metals Alloys and their properties Reactivity series Corrosion of metals Extraction of metals Chemistry of the environment Water Fertilisers Air quality and climate Organic chemistry Formulae, functional groups and terminology Naming organic compounds Fuels Alkanes Alkenes Alcohols Carboxylic acids Polymers Experimental techniques and chemical analysis Experimental design Acid–base titrations Chromatography Separation and purification Identification of ions and gases

By past paper

May/June 2016 May/June 2015

Example questions

The apparatus for fractional distillation shown below is being used to separate a mixture of two liquids. The thermometer is absent from the setup. Where should the bulb of the thermometer be positioned?

Separation and purification · May/June 2015

When powdered calcium carbonate is added to dilute hydrochloric acid, calcium chloride, water and carbon dioxide are formed. Which ionic equation, with state symbols included, correctly represents this reaction?

The characteristic properties of acids and bases · May/June 2015

State the relative molecular mass, $M_r$, of $\text{CuSO}_4\cdot 5\text{H}_2\text{O}$?

Relative masses of atoms and molecules · May/June 2015

$1.00\,\text{dm}^3$ of ammonia gas is made to pass over heated copper(II) oxide. $3\text{CuO(s)} + 2\text{NH}_3\text{(g)} \rightarrow 3\text{Cu(s)} + \text{N}_2\text{(g)} + 3\text{H}_2\text{O(l)}$ At the same temperature and pressure as the ammonia, what volume of nitrogen is produced?

The mole and the Avogadro constant · May/June 2015

When aqueous copper(II) sulfate is electrolysed with copper electrodes, what are the correct products formed at the anode (positive electrode) and the cathode (negative electrode)?

Electrolysis · May/June 2015

Concentrated aqueous sodium chloride is electrolysed with inert electrodes. Which statement about this electrolysis is correct?

Electrolysis · May/June 2015

The diagram illustrates the energy profile of a chemical reaction. Two energy changes are marked $X$ and $Y$. Which statement about the reaction is correct?

Exothermic and endothermic reactions · May/June 2015

From the graph, curve 1 was produced by monitoring the decomposition of $100\,\text{cm}^3$ of $1.0\,\text{mol dm}^{-3}$ hydrogen peroxide solution, catalysed by manganese(IV) oxide. $2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2$ Which change to the original experimental conditions would generate curve 2?

Rate of reaction · May/June 2015

The equation below represents a redox reaction involving iron(II) chloride and chlorine gas. $2\text{FeCl}_2 + \text{Cl}_2 \rightarrow 2\text{FeCl}_3$ Which equation represents the reduction step in this reaction?

Redox · May/June 2015

Identify the row that correctly describes the oxides.

Oxides · May/June 2015