OCR Gateway GCSE Chemistry revision notes

Describe the structure of the atom and use atomic number and mass number correctly.

Use periodic table trends to predict properties and explain the history of its development.

Write and use electronic configurations to predict chemical behaviour.

Describe ionic bond formation and predict the formula of ionic compounds.

Draw dot-and-cross diagrams and relate structure to properties for covalent substances.

Describe metallic bonding and explain how alloying changes the properties of metals.

Use the mole concept to calculate masses and reacting quantities from balanced equations.

Calculate concentration, volume and moles for solutions and use titration data.

Define acids and alkalis in terms of pH, H⁺ ions and neutralisation reactions.

Predict products of electrolysis and write half-equations for electrode reactions.

Use the reactivity series to predict displacement reactions and explain how metals are extracted.

Classify reactions by their energy changes and use bond energy data to calculate enthalpy changes.

Explain and investigate how concentration, temperature, surface area and catalysts affect reaction rate.

Apply Le Chatelier's principle to predict the effect of changing conditions on equilibrium position.

Name and draw alkanes and alkenes and explain how crude oil is processed.

Describe addition and condensation polymerisation and compare the properties of different materials.

Describe the composition of the atmosphere and explain how human activity affects climate.

Describe how potable water is produced and explain the tests for water purity.