What this topic covers
Topic 5: Energy changes has 2 subtopics:
- Exothermic and endothermic reactions
- Chemical cells and fuel cells (chemistry only)
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GCSE AQA Foundation Chemistry · Topic 5 of 11
Topic 5: Energy changes – GCSE AQA Foundation Chemistry revision notes
Choose a subtopic. Topic 5: Energy changes covers Exothermic and endothermic reactions and Chemical cells and fuel cells (chemistry only) in GCSE AQA Foundation Chemistry. 6 lessons in 2 subtopics.
Revise Topic 5: Energy changes for GCSE AQA Foundation Chemistry, including Exothermic and endothermic reactions. 6 lessons across 2 subtopics.
6
Lessons
2
Subtopics
Topic 5: Energy changes lessons by subtopic
6 lessons, grouped by subtopic.
Exothermic and endothermic reactions
- Understanding Exothermic and Endothermic Reactions
- Examples and Applications of Energy Transfer Reactions
- Drawing and Understanding Reaction Profiles
- Activation Energy and Collision Theory
Chemical cells and fuel cells (chemistry only)
More in this course
Go back to the full GCSE AQA Foundation Chemistry topic list, or practise this topic with past-paper questions.
Frequently asked questions
What is Topic 5: Energy changes?
Topic 5: Energy changes covers Exothermic and endothermic reactions and Chemical cells and fuel cells (chemistry only) in GCSE AQA Foundation Chemistry. 6 lessons in 2 subtopics.
What are examples of endothermic reactions?
Examples of endothermic reactions include thermal decomposition, such as calcium carbonate breaking down into calcium oxide and carbon dioxide, and citric acid reacting with sodium hydrogencarbonate. The Examples and Applications of Energy Transfer Reactions notes cover this in full.
What does an exothermic reaction profile look like?
In an exothermic reaction profile, the products are at a lower energy level than the reactants, because energy is released to the surroundings. The Drawing and Understanding Reaction Profiles notes cover this in full.
What is combustion?
Combustion is the reaction of a fuel with oxygen that releases energy as heat and light. The Examples and Applications of Energy Transfer Reactions notes cover this in full.
What is activation energy?
Activation energy is the minimum amount of energy that particles must have to react when they collide, measured in kJ/mol. The Activation Energy and Collision Theory notes cover this in full.
What are examples of exothermic reactions?
Examples of exothermic reactions include the combustion of fuels such as methane, oxidation reactions such as iron rusting, and neutralisation of acids and bases. The Examples and Applications of Energy Transfer Reactions notes cover this in full.
What does an endothermic reaction profile look like?
In an endothermic reaction profile, the products are at a higher energy level than the reactants, because energy is absorbed from the surroundings. The Drawing and Understanding Reaction Profiles notes cover this in full.
What is an electrode?
An electrode is a conductor through which electricity enters or leaves an electrolyte during chemical reactions. The How Cells and Batteries Work notes cover this in full.
How do hand warmers work?
Many hand warmers use the slow oxidation of iron powder by oxygen from the air, 4Fe + 3O₂ → 2Fe₂O₃, which releases heat for hours. The Examples and Applications of Energy Transfer Reactions notes cover this in full.