Rate of reaction
What Rate of reaction means in Combined Science GCSE, as defined for AQA.
Definitions of Rate of reaction
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Reference: AQA
A quantity that depends on the frequency of successful collisions, so a factor that increases this frequency increases it.
Measures how quickly a reactant is used up or a product is formed, being the change in amount divided by the time taken.
How quickly photosynthesis takes place, shown on a graph as the dependent variable on the y-axis, including its units.
How fast a reaction goes, increased by raising temperature through more frequent and more energetic collisions.
The mean rate of reaction tells you how quickly a product appears, on average, across a chosen time interval.
Shown by the gradient of the curve: a steeper curve means a faster reaction at that time.
Topics that use Rate of reaction
- Calculating rates of reactions (AQA GCSE)
- Collision theory and activation energy (AQA GCSE)
- Rate of photosynthesis (AQA GCSE)
Related terms
- Gradient
- Activation energy
- Catalysts
- Choosing scales
- Collision theory
- Concentration and pressure
- Control variables
- Data presentation
Using Rate of reaction in the exam
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