Energetics & Rates of Reaction
Exothermic and endothermic, bond energies, and collision theory, two sections the paper loves to combine into one graph question.
What this lesson covers
Energetics & Rates of Reaction is a 7-part O Level Chemistry lesson. Each part makes one point and then hands over to the next, so it can be read in a sitting or picked up again at the part you stopped on. It defines the idea in plain words before using it, works through an example step by step, breaks the topic into its parts and compares them, names the mistakes that cost marks in an exam, ends with a recap of what to remember.
How it begins
Exothermic reactions transfer energy to the surroundings (temperature rises) and ΔH is negative. Combustion, neutralisation, respiration, most oxidations. Endothermic reactions take energy in (temperature falls) and ΔH is positive. Thermal decomposition, photosynthesis, dissolving ammonium nitrate. A reaction profile plots energy against progress.
The 7 parts
- Exothermic, endothermic, and the profile diagram
- Bond energies: why a reaction is exo- or endothermic
- Rate: measuring it, and reading the graph
- Collision theory: one sentence for each factor
- Where marks go
- What to remember
- Watch one worked through
Practise Energetics & Rates of Reaction
Everything on QuizByt for O Level Chemistry that goes with this lesson: read it first, then test yourself while it is fresh.
🧠 5 quizzes on Energetics & Rates of Reaction (2 easy, 2 medium, 1 hard)
Work up from easy to hard: the hard quiz asks the O Level exam-style questions on Energetics & Rates of Reaction.
🖨️ Printable worksheet
Energetics & Rates of Reaction on paper for O Level, with room to write the working out. Preview the first page free.
🎮 Games for O Level Chemistry
Memory and reasoning games at the right level for O Level. Passing a quiz on Energetics & Rates of Reaction earns the credits that open them.
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