A-level Chemistry/WJEC

This is the branch of the A-level Chemistry book, designed to follow the WJEC and eduqas specifications. It is not endorsed by WJEC or eduqas. It will hopefully be useful as a revision guide, or for those seeking a basic grounding in the principles of the course. WJEC A-level Chemistry homepage WJEC Chemistry Data Booklet, issued in every exam AS Units UNIT 1 1.1 Formulae and Equations 75% April 3rd 2026 1.2 Basic Ideas About Atoms 75% March 23rd 2026 1.3 Chemical Calculations 25% March 4th 2026 1.4 Bonding 50% March 26th 2026 1.5 Solid Structures 50% October 29th 2025 1.6 The Periodic Table 50% February 17th 2026 1.7 Simple Equilibria and Acid-Base Reactions 50% March 3rd 2026 UNIT 2 2.1 Thermochemistry 50% August 9th 2025 2.2 Rates of Reaction 50% March 19th 2026 2.3 The Wider Impact of Chemistry 50% March 29th 2026 2.4 Organic Compounds 50% February 16th 2026 2.5 Hydrocarbons 75% March 19th 2026 2.6 Halogenoalkanes 50% April 2nd 2026 2.7 Alcohols and Carboxylic Acids 50% July 23rd 2025 2.8 Instrumental Analysis 75% April 12th 2026 A2 Units UNIT 3 3.1 Redox and Standard Electrode Potential 25% February 17th 2026 3.2 Redox Reactions 25% February 13th 2026 3.3 Chemistry of the p-Block 25% March 19th 2026 3.4 Chemistry of the d-Block Transition Metals 50% March 19th 2026 3.5 Chemical Kinetics 50% March 19th 2026 3.6 Enthalpy Changes for Solids and Solutions 50% August 9th 2025 3.7 Entropy, and Feasibility of Reactions 25% March 28th 2026 3.8 Equilibrium Constants 25% March 19th 2026 3.9 Acid-base Equilibria 50% January 1st 2026 UNIT 4 4.1 Stereoisomerism 25% March 23rd 2026 4.2 Aromaticity 50% March 19th 2026 4.3 Alcohols and phenols 25% January 1st 2026 4.4 Aldehydes and ketones 75% February 22nd 2026 4.5 Carboxylic acids and their derivatives 25% February 26th 2026 4.6 Amines 50% April 2nd 2026 4.7 Amino Acids, Peptides and Proteins 75% April 10th 2026 4.8 Organic Synthesis and Analysis 25% January 1st 2026 WJEC Peculiarities Unusual topics required by WJEC: Radioactive decay and nuclear equations The CsCl lattice and an explanation of why CsCl forms a different lattice to NaCl Trends in solubility of Group 2 sulfates and hydroxides The pH of solutions of salts formed from weak acids or weak bases Extensive coverage of p-block elements including: inert pair effect, expansion of the octet, general properties of p-block chlorides and general trends down each group, and the properties of the two forms of boron nitride. Decarboxylation of carboxylic acids Formation of, for example, benzoic acid by oxidation of methylbenzene Reactions of phenols with iron(III) chloride, acyl chlorides and acid anhydrides Iodoform test for methyl carbonyl groups Enzymes Topics not required by WJEC: Global warming related to IR absorption by greenhouse gases Plastic waste Fragmentation of organic molecules in mass spectrometry Linking chromatography to MS Factors affecting industrial reaction conditions Stereoisomerism in complex ions Haemoglobin and EDTA as complex ions Reactions of complex ions with aqueous ammonia Factors affecting lattice enthalpy Cracking and reforming of hydrocarbons Friedel-Crafts acylation