Chemistry Revision & Mock Test
Study the core Chemistry topics, practise original questions, receive an instant mark, read corrections and see which topics need more work.
16 topic guides · 20-question mock · instant corrections
Practice notice: Original New Horizon practice questions – not an official ZIMSEC examination paper.
Chemistry topic guides
1. Laboratory Techniques and Safety
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Identify hazards, select PPE, heat substances safely, measure accurately and separate mixtures using filtration, crystallisation, distillation or chromatography.
Exam focus: State the apparatus, method and observation clearly.
2. Matter
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Use the particle model to explain solids, liquids, gases, diffusion and changes of state.
Exam focus: Changes of state are physical changes; no new substance forms.
3. Atoms, Elements and Compounds
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Atoms contain protons, neutrons and electrons. Elements contain one type of atom; compounds contain chemically combined elements.
Exam focus: Atomic number equals proton number.
4. Chemical Bonding
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Ionic bonding involves electron transfer; covalent bonding involves shared electrons; metallic bonding explains conductivity and malleability.
Exam focus: Link bonding and structure to physical properties.
5. Mole Concept and Stoichiometry
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Use relative masses, moles, balanced equations, reacting ratios, concentrations and gas volumes in calculations.
Exam focus: Balance the equation before using mole ratios.
6. Acids, Bases and Salts
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Acids produce hydrogen ions in water, bases neutralise acids and salts can be prepared by suitable reactions.
Exam focus: Choose salt preparation method from solubility and reactants.
7. Electrochemistry and Redox
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Oxidation is electron loss and reduction is electron gain. Electrolysis uses electricity to decompose ionic substances.
Exam focus: Ions, not electrons, move through the electrolyte.
8. Chemical Energetics
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Exothermic reactions release energy; endothermic reactions absorb energy. Bond breaking absorbs and bond making releases energy.
Exam focus: State whether the surroundings warm or cool.
9. Equilibria
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Dynamic equilibrium occurs in a closed system when forward and reverse reaction rates are equal.
Exam focus: At equilibrium reactions continue; concentrations are constant, not necessarily equal.
10. Rates of Reaction
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Rate increases with temperature, concentration, pressure, surface area or a catalyst because successful collisions become more frequent.
Exam focus: A catalyst lowers activation energy and is not used up.
11. Periodic Table
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Groups contain elements with similar outer-electron patterns and chemical properties. Trends help predict reactions.
Exam focus: Group number helps infer valency for main-group elements.
12. Metals and Extraction
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Reactivity determines extraction method. Metals above carbon usually require electrolysis; less reactive metals may be reduced by carbon.
Exam focus: Consider energy cost, ore grade and environmental impact.
13. Non-Metals
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Study oxygen, hydrogen, nitrogen, sulfur, halogens and their important compounds and tests.
Exam focus: Learn gas tests and observations precisely.
14. Fuels and Hydrocarbons
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Crude oil is separated by fractional distillation. Alkanes are saturated; alkenes are unsaturated and decolourise bromine water.
Exam focus: Complete combustion forms carbon dioxide and water.
15. Alcohols, Acids and Polymers
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Ethanol can be made by fermentation or hydration. Carboxylic acids react as acids; monomers join to form polymers.
Exam focus: Distinguish addition polymerisation from condensation.
16. Environmental and Applied Chemistry
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Chemistry supports agriculture, water treatment and industry, but pollution, greenhouse gases and waste require control.
Exam focus: Evaluate benefits, risks and practical mitigation.
Chemistry mock test
Choose one answer for each question, then submit. Unanswered questions are marked incorrect.