Chemistry papers
Cambridge (CAIE) · O Level · Chemistry
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29Experimental chemistry2025, 2024, 2023, 2022, 2021, 202073The particulate nature of matter2025, 2024, 2023, 2022, 2021, 202014Formulae, stoichiometry and the mole concept2025, 2023, 2022, 2021, 202098Electrolysis2025, 2024, 2023, 2022, 2021, 202028Energetics2025, 2024, 2023, 2022, 2021, 202054Chemical reactions2025, 2024, 2023, 2022, 2021, 202090Acids, bases and salts2025, 2024, 2023, 2022, 2021, 202020The Periodic Table2025, 2023, 2022, 2021, 202048Metals2025, 2024, 2023, 2022, 2021, 202021Air and atmosphere2025, 2023, 2022, 2021, 2020159Organic chemistry2025, 2024, 2023, 2022, 2021, 2020297Qualitative Analysis2025, 2024, 2023, 2022, 2021, 2020108Titration2025, 2024, 2023, 2022, 2021, 202084Stoichiometry2025, 2024, 2022, 2021, 202053Redox Reactions2025, 2024, 2023, 2022, 2021, 202036Thermochemistry2025, 2024, 2022, 2021, 202035Polymers2025, 2024, 2023, 2022, 2021, 202035Atomic Structure2025, 2024, 2023, 2022, 2021, 202034Unclassified2025, 2023, 2022, 2021, 202032Acids and Bases2025, 2024, 2023, 2022, 2021, 202030Equilibrium2025, 2024, 2023, 2022, 2021, 202029Reaction Rates2025, 2024, 2023, 2022, 2021, 202029Mole Calculations2025, 2024, 2023, 2022, 2021, 202026Environmental Chemistry2025, 2024, 2023, 2022, 2021, 202021States of Matter2025, 2024, 2023, 2022, 2021, 202021Separation Techniques2025, 2024, 2022, 2021, 202021Ionic Compounds2025, 2024, 2022, 2021, 202020Concentration Calculations2025, 2023, 2022, 2021, 202020Rates of Reaction2025, 2024, 2023, 2022, 2021, 202020Chromatography2025, 2024, 2023, 2021, 202020Periodic Table2025, 2024, 2023, 2021, 202019Rate of Reaction2025, 2023, 202218Solubility2025, 2024, 202017Reactivity Series2025, 2024, 2023, 2021, 202017Structure and Bonding2025, 2024, 2023, 2021, 202017Neutralisation Reaction202317Transition Metals2025, 2024, 2023, 2021, 202016Experimental Techniques2025, 2024, 2022, 202116Chemical Equations2024, 2023, 2021, 202015Reactivity of Metals2024, 2023, 2022, 202114Esters2025, 2024, 2023, 2022, 2021, 202013Salt Preparation2025, 2024, 2023, 2022, 2021, 202013Chemical Tests2025, 2024, 2023, 202212Fuel Cells2025, 2024, 2023, 202012Gas Laws2025, 2024, 2023, 2021, 202012Extraction of Metals2024, 2023, 2022, 2021, 202012Industrial Processes2025, 2024, 2023, 2022, 2021, 202011Graph Plotting2025, 2023, 2022, 2021, 202011Neutralisation2023, 202111Covalent Bonding2025, 2024, 2023, 2022, 2021, 202010Catalysis2025, 2023, 2022, 2021, 202010Alkenes2025, 2023, 2022, 2021, 202010Water Treatment2025, 2024, 2023, 202010Chemical Compounds2023, 20209Isotopes2025, 2024, 2023, 2022, 20219Chemical Bonding2025, 2023, 2022, 2021, 20209Metallurgy2025, 2022, 2021, 20209Noble Gases2025, 2024, 2022, 20218Experimental Design2025, 2023, 2021, 20208Acid-Base Reactions2025, 2024, 2023, 2021, 20208Fertilisers2025, 2024, 20208Air Pollution2025, 2024, 20238Gas Tests2025, 2023, 2022, 20218Alcohols2025, 2021, 20208Metallic Bonding2025, 2024, 2022, 2021, 20208Data Analysis2022, 2021, 20208Hydrocarbons2025, 2024, 20208Graphical Analysis2025, 2023, 20217Enthalpy Changes2024, 2023, 20227Flame Tests2025, 20247Cracking2024, 2022, 2021, 20207Fractional Distillation2024, 2021, 20207Empirical Formula2024, 2023, 2021, 20207Precipitation Reactions2023, 2022, 2021, 20207Oxides2024, 2022, 20207Thermal Decomposition2024, 2021, 20206Periodic Trends2023, 20216Corrosion2025, 2023, 20216Preparation of Salts2025, 2024, 2023, 20206Polymerisation2024, 2022, 2021, 20206Catalysts2025, 2024, 2023, 20225Water and Solutions20255Alkanes2025, 2023, 20215Molecular Mass2024, 2023, 2021, 20205Kinetics2025, 20205Electronic Configurations20245Industrial Chemistry2025, 2024, 20205Kinetic Theory2024, 2021, 20205Gas Volumes2024, 2023, 20205Alloys2025, 2023, 20205Oxidation Reactions2021, 20205Rusting of Iron20235Isomerism2025, 2024, 20235Qualitative analysis2022, 20205Practical Chemistry20215Combustion2025, 2023, 2021, 20204Group I Elements2025, 2024, 2023, 20204Cation Identification2023, 20214Reactions of Acids20224Chemical Formulas2025, 2024, 20204Chemical Changes2025, 20234Redox reactions2022, 20204Addition Reactions2025, 2024, 2021, 20204Moles and stoichiometry20204Moles and Stoichiometry2021, 20204Chemical Equilibrium2024, 2023, 20214Graph Analysis2025, 2022, 20214Electronic Configuration2022, 20204Gas Collection Methods20224Qualitative Analysis of Anions20244Percentage Composition2025, 2023, 20224Carboxylic Acids2025, 2024, 20214Practical Techniques20254Gas Calculations2023, 2022, 20214Reactivity series20204Environmental chemistry20203Energy Changes2022, 20213Recycling2021, 20203Metals and Non-metals2025, 20243Ion Identification20233Organic reactions2022, 20203Electrical Conductivity2024, 20203Gas Identification2023, 20213Electrochemistry2025, 20203Dot-and-Cross Diagrams2024, 20203Combustion Reactions2024, 20233Indicators20233Metallic bonding2022, 20203Salts20243Mass Calculations2022, 20203Laboratory Equipment20223Covalent bonding2022, 20203Chemical Formulae2024, 20233Metal Extraction20243Collision Theory2023, 20213Exothermic and Endothermic Reactions2024, 20223Organic Reactions2024, 20203Diffusion2025, 20243Bonding2025, 20203Quantitative Analysis20243Substitution Reactions2024, 20233Ionic Bonding2024, 20223Mole Concept2025, 20243Crystallization2021, 20203Measurement and apparatus2022, 20203Fuels2025, 20213Atomic structure2022, 20203Contact Process2024, 20213Reaction Pathways2025, 20243Uses of Metals2024, 2023, 20223Ions2025, 20242Extraction of metals20202Equilibria20202Anion Identification20212Fermentation20202Gases2024, 20212Physical Changes20242Exothermic Reactions20242Relative Molecular Mass20242Electronic configuration20202Greenhouse Gases2021, 20202Reactions of Alkenes2024, 20212Physical Properties20202Concentration calculations20202Proteins2024, 20202Energy changes20202Graph Interpretation2023, 20202Corrosion and Prevention2024, 20232Blast Furnace2025, 20202Displacement Reactions2025, 20212Preparation of salts20222Apparatus Accuracy20202Alkanes and Alkenes20252Gas laws20202Electroplating2021, 20202Experimental Errors20212Properties of Metals2023, 20222Fertilizers2024, 20212pH Measurement20242Reactions of Ammonium Compounds20212Ionic Equations2022, 20212Molecular Structure2023, 20202Ions and Charges20222Crude Oil20202Gas Volume Calculation20232Haber Process2024, 20222Molar Mass Calculations20222Empirical formula20202Fractional distillation20202Soil Chemistry2023, 20222Halogens2025, 20232Rates of reaction20202Chemical Calculations2023, 20212Industrial processes20202Percentage Yield2022, 20202Flame Tests for Metal Ions20242Electricity and conduction20202Graphing and Data Analysis20252Empirical and Molecular Formula20202Photosynthesis20242Empirical and Molecular Formulas20222Empirical Formulas20242Carbohydrates20202Salt preparation20202Precision in Measurement20242Homologous Series2023, 20212Air Composition20252Apparatus Identification20211Properties of Alkanes20211Combustion reactions20221Mixtures20241Identification of Ionic Compounds20241Measurement Precision20231Properties of Substances20241Observation of Solutions20241Measurement20201Concentration Calculation20231Covalent Compounds20251Environmental Impact20241Molar Mass20251Gas Diffusion20241Organic Compounds20241Uses of Chemicals20201Electrochemical Cells20221Solutions20231Sublimation20241Renewable Energy20211Biochemistry20211Energy Changes in Reactions20241Molar Mass and Concentration20211Decomposition of Baking Soda20231Reactions with Acids20241Titration Errors20211Purification Methods20201Data Trend Analysis20241Carboxylic acids20221Laboratory Apparatus20241Thermal Conductivity20231Experimental Planning20241Concentration and Rate of Reaction20241Reactions of Metals20251Reducing Agents20241Neutralisation and Exothermic Reactions20231Properties of materials20201Testing for Oxidising Agents20221Ions and Isotopes20241Empirical and molecular formulae20221Bonding and structure20201Relative Masses20241Covalent Structures20241Laboratory Safety20201Acidity of Solutions20211Error Reduction in Experiments20241Solubility of Compounds20211Gas Testing Techniques20241Titration Technique20201Volumetric Analysis20241Functional Groups20201Structure of Solids20231Volume Calculations20211Metallic Structures20251Condensation Reactions20241Properties of Liquids20241Complex Ions20251Noble gases20221Ions and Electrons20251Data Recording20201Moles and Mass20241Pollutants20221Chemical Kinetics20251Halogen Reactions20251Rusting20201Properties of Ionic Compounds20221Group Trends20211Group VII Elements20201Diffusion and gas laws20221Gas Behavior20241Measurement and Apparatus20221Complex Ion Formation20231Ions in Solution20211Gas Collection20211Desalination20201Isotopes and relative atomic mass20221Properties of Gases20241Temperature Changes in Neutralisation20251Properties of Elements20211Ions and Ionic Compounds20231Endothermic and Exothermic Reactions20221Temperature Prediction20241Group II Elements20241Gas laws and experiments20221Carbon Cycle20211Hydration and Dehydration20241Corrosion Prevention20211Trends in the Periodic Table20221Purification20251Hydration Reactions20241Chemical equilibrium20221Experimental Setup20211Organic Nomenclature20231Reaction Energetics20231Chemical and Physical Changes20241pH and Ions20241Acids and bases20221Oxidation Numbers20231Titration and energetics20221Intermolecular Forces20221Unsaturated Compounds20241pH and Acidity20241Ionic and covalent compounds20221Relative Atomic Mass20251Molecular and Giant Structures20241Precision in Measurements20231Solubility Rules20231Molecular Formulas20241Safety in Chemistry20211Periodic trends20221Thermal decomposition20221States of matter20221Gas Preparation and Collection20221Anion Test20231Saturated Compounds20241Properties of Compounds20241Reactions of Oxides20231Properties of Bases20231Water of Crystallisation20241Reactions of Alkanes20211Salts and Solubility20251Reaction kinetics20221Ions and Electron Configuration20231Oxidation and Reduction20241Gas Production20241Sulfuric Acid20201Kinetic Particle Theory20201Allotropes and Structures20231Gaseous State20211Empirical and Molecular Formulae20241Fats20201Petroleum Fractions20231Electricity20201Endothermic Reactions20241Ionic and covalent bonding20221Temperature Change Calculation20241Molecular Formula20201Sources of Methane20211Reactions of Chlorides20211Chemical formulae20221Chemical bonding20201Measurement of Volume20201Sulfur and its compounds20221Separation techniques20221Combustion of Alcohols20231Global Warming20241Measurement Accuracy20251Safety20241Catalytic Converters20211pH Indicators20201Classification of Substances20231Group 1 Elements20241Measurement Techniques20251Isotopes and Atomic Mass20241Greenhouse Effect20241Water Chemistry20201Reaction Observations20221Isotopes and Relative Atomic Mass20241Acid Dissociation20251Climate Change Mitigation20241Ammonia and Its Compounds20201Organic Acids20241Temperature Change in Solutions2024
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