Writing Chemistry Answers & Command Words
Command-word execution and writing structure that turns chemistry knowledge into mark-scheme-ready answers.
This route helps when you keep missing the same type of question across different topics. Use it to combine lesson notes with linked practice and tools in one place.
Notes and Hubs in This Route
- Alcohol Structures and Isomers
Draw and name C1–C4 alcohols, distinguish molecular and grouped formulae, and recognise changes in branching and hydroxyl-group position.
- Alkane Structures and Isomers
Draw and name the C1–C4 alkanes, use their general formula, explain physical trends, and distinguish the two C4 structural isomers.
- Addition Reactions of Alkenes
Follow ethene through hydrogenation, bromination, hydration and polymerisation, and explain hydrogenation of vegetable oils.
- Alkene Structures and the Bromine Test
Draw C2–C4 alkene structures, distinguish structural isomers, and use bromine-water observations to identify unsaturation.
- Carboxylic Acid Structures and Reactions
Draw and name C1–C4 carboxylic acids, explain partial ionisation, and predict reactions with metals, bases and carbonates.
- Condensation Polymers
Recognise nylon and Terylene from partial chains, distinguish amide and ester linkages, and connect man-made fibres to their uses.
- Cracking and Refinery Demand
Explain why refineries crack hydrocarbons, describe the conditions, and use atom conservation to deduce products.
- Esters: Formation and Naming
Locate the ester linkage, form an ester from a C1–C4 alcohol and carboxylic acid, and work backwards from its name or structure.
- Ethanol Production
Compare fermentation of glucose with hydration of ethene, explain their conditions, and choose a route using stated production priorities.
- Ethanol Reactions and Oxidation
Distinguish ethanol combustion from oxidation to ethanoic acid, conserve oxygen atoms, and interpret acidified manganate(VII) observations.
- Crude Oil and Fractional Distillation
Explain why natural gas and crude oil are non-renewable, how fractional distillation separates crude oil, and how fraction properties determine their uses.
- Interpreting Crude-Oil Fractions
Use boiling ranges, column conditions and material properties to explain crude-oil fractions and choose suitable uses.
- Introduction to Organic Chemistry
Organic chemistry basics: homologous series, functional groups, general formulas, and how saturation/unsaturation links to reactions and tests.
- Plastic Waste and Recycling
Explain plastic disposal problems, distinguish physical and chemical recycling, and weigh social, economic and environmental trade-offs.
- Addition Polymers
Read repeat units, preserve atoms and substituents, and deduce alkene monomers from their addition polymers.
- Because → Therefore: How to Explain Trends in Chemistry
Use a mark-scheme-safe Because-Therefore-So template to explain trends in periodicity, kinetics, equilibria, electrochemistry, and data questions.
- Chemistry Definitions: Conditions, State Symbols, Units
Mark-scheme-safe definitions for O Level and A Level chemistry, including conditions, state symbols, unit phrases, and drill templates.
- Explain vs Describe vs Suggest (Chemistry Command Words)
Learn how to explain, describe and suggest in chemistry with answer templates, mark-scheme triggers, and worked examples from graphs and experiments.