# The rate of a chemical reaction: including graphs

I can describe what happens during a chemical reaction as it progresses over time and interpret graphs showing how the instantaneous rate of the reaction changes.

# The rate of a chemical reaction: including graphs

I can describe what happens during a chemical reaction as it progresses over time and interpret graphs showing how the instantaneous rate of the reaction changes.

## Lesson details

### Key learning points

- Most chemical reactions start more quickly and slow down as they progress.
- The rate of a chemical reaction is equal to the amount of product formed per unit time (or reactant used per unit time).
- The mean rate of a chemical reaction is different to the instantaneous rate that changes throughout the reaction.
- Graphs of mass, volume, or concentration vs. time can all represent the changing rate of a chemical reaction.
- The gradient of a rate of reaction graph can be calculated from a tangent drawn at a point on the curve.

### Common misconception

To calculate the instantaneous rate of reaction by reading values from the graph at a specific time.

Students need to draw a tangent in order to calculate the gradient of the graph at a specific time to work out the instantaneous rate of reaction.

### Keywords

Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place.

Mean rate of reaction - The mean rate of reaction is the average rate at which reactants are converted into products over a given period of time.

Instantaneous rate of reaction - The instantaneous rate of reaction is the rate at which reactants are converted into products at a specific moment in time.

Tangent - A tangent is a straight line that touches a curve at exactly one point without crossing it.

Gradient - The gradient on a graph represents the rate at which one quantity changes relative to another.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

### 6 Questions

## Exit quiz

### 6 Questions

the rate in which reactants form products in a given period of time

the rate in which reactants form products at a specific moment in time

a straight line that touches a curve at exactly one point

represents the rate at which one quantity changes relative to another