What this topic covers
Topic 4: Chemical changes has 3 subtopics:
- Reactivity of metals
- Reactions of acids
- Electrolysis
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GCSE AQA Foundation Combined Science Chemistry · Topic 4 of 11
Topic 4: Chemical changes – GCSE AQA Foundation Combined Science Chemistry revision notes
Choose a subtopic. Topic 4: Chemical changes covers Reactivity of metals, Reactions of acids, and Electrolysis in GCSE AQA Foundation Combined Science Chemistry. 17 lessons in 3 subtopics.
Revise Topic 4: Chemical changes for GCSE AQA Foundation Combined Science Chemistry, including Reactivity of metals, Reactions of acids, and Electrolysis.
17
Lessons
3
Subtopics
Topic 4: Chemical changes lessons by subtopic
17 lessons, grouped by subtopic.
Reactivity of metals
- Metal Reactions and the Reactivity Series
- Displacement Reactions and the Extended Reactivity Series
- How metals are found and extracted
- Reduction and oxidation in metal extraction
- Evaluating metal extraction processes
- Metal Oxides and Oxidation Reactions
Reactions of acids
- What Salts Are Produced in Neutralisation?
- Neutralisation Reactions and Salt Formulae
- Making Soluble Salts from Acids
- Crystallising Salt Solutions and Making Pure Samples
- Understanding the pH Scale
- Acids, Alkalis and Neutralisation
Electrolysis
More in this course
Go back to the full GCSE AQA Foundation Combined Science Chemistry topic list, or practise this topic with past-paper questions.
Frequently asked questions
What is Topic 4: Chemical changes?
Topic 4: Chemical changes covers Reactivity of metals, Reactions of acids, and Electrolysis in GCSE AQA Foundation Combined Science Chemistry. 17 lessons in 3 subtopics.
What is a base in chemistry?
A base is a substance that neutralises acids by accepting hydrogen ions. The Neutralisation Reactions and Salt Formulae notes cover this in full.
What is the order of the metal reactivity series?
The metal reactivity series, from most reactive to least reactive, is potassium, sodium, lithium, calcium, magnesium, aluminium, zinc, iron, copper. The Metal Reactions and the Reactivity Series notes cover this in full.
What is an alkali?
An alkali is a soluble base that releases hydroxide ions (OH⁻) when dissolved in water. The Neutralisation Reactions and Salt Formulae notes cover this in full.
What is a displacement reaction?
A displacement reaction is a reaction where a more reactive element takes the place of a less reactive element in a compound. The Displacement Reactions and the Extended Reactivity Series notes cover this in full.
What is rust?
Rust is iron oxide, formed when iron slowly oxidises in damp air. The Metal Oxides and Oxidation Reactions notes cover this in full.
What happens when a metal reacts with an acid?
A metal reacting with a dilute acid produces a salt and hydrogen gas: metal + acid → salt + hydrogen. The Metal Reactions and the Reactivity Series notes cover this in full.
What colour is universal indicator at different pH values?
Universal indicator is red at pH 0-3, orange at pH 4-5, yellow at pH 6, green at pH 7 (neutral), blue at pH 8-10 and purple at pH 11-14. The Understanding the pH Scale notes cover this in full.
What is the formula of calcium chloride?
The formula of calcium chloride is CaCl₂. The What Salts Are Produced in Neutralisation? notes cover this in full.