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GCSE Chemistry · key term
The minimum energy that colliding particles must have for a reaction to occur.
Used by AQA, Edexcel and OCR
Specification 4.5.1.2, 4.6.1.3, 4.6.1.4 · Paper 1, Paper 2
The minimum energy that reacting particles must have for a reaction to occur when they collide.
Revise: Reaction ProfilesThe activation energy is the minimum energy that the reacting particles must have for the collision to result in a reaction.
The minimum energy that reacting particles must have when they collide for a reaction to occur.
Specification 7.3, 7.4, 7.7, 7.15, 7.16 · Paper 2
Revise: Collision TheoryA collision is successful only if the colliding particles have sufficient energy. They must have at least the activation energy: the minimum collision energy needed for the reaction to begin.
The minimum energy particles must have when they collide for a reaction to occur.
The minimum energy that colliding particles need for a reaction to occur.
The minimum energy that colliding reactant particles must have for a reaction to occur.
The minimum energy that reacting particles must have for a chemical reaction to start.
The minimum energy that reacting particles must have for a reaction to occur.
Specification CM3.2i, C3.2b, C3.2c, C5.2d, C5.2h · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The minimum energy that colliding particles need for a reaction to occur.
Revise: Interpreting Reaction ChartsThe activation energy is the vertical difference between the reactants’ level and the peak: it is the minimum energy colliding particles need to react. Even a reaction that gives out energy overall can need an initial input of energy to get started.
The energy needed to start a chemical reaction, shown on a reaction profile by the rise from the reactants’ energy level to the peak.
The minimum energy that reacting particles need for a reaction to occur.
The minimum energy needed in a collision for reactant particles to react.
The minimum energy that reacting particles must have for a collision to result in a reaction.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The minimum energy needed for a reaction to occur; on a reaction profile it is the energy difference between the reactants and the top of the pathway.
Revise: Reaction profilesActivation energy is the minimum energy needed for a reaction to occur.
The minimum energy that reacting particles must have for a reaction to occur.
The minimum energy that reacting particles must have for a reaction to occur; on a reaction profile, it is the energy difference from the reactants’ level to the peak.
The minimum energy that colliding particles need for a reaction to occur.
Measure activation energy from the reactants’ energy level to the peak, not from the bottom of the axis.
Keep the activation energy and overall energy change distinct: one reaches the peak, while the other compares reactants with products.
For an explanation, give the complete chain: the catalyst provides a different pathway with lower activation energy, so a greater proportion of collisions are successful and the rate increases.
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