Concentration and rate: analysis
I can represent graphically and explain how the rate of reaction depends on the concentration of one of the reactants.
Concentration and rate: analysis
I can represent graphically and explain how the rate of reaction depends on the concentration of one of the reactants.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The changing rate of a chemical reaction can be represented by a graph of volume of gas produced against time.
- When reacting excess acid, the same volume of gas is produced for equal amounts of magnesium.
- Doubling the concentration doubles the rate of reaction.
- The gradient of a rate of reaction graph can be calculated from a tangent drawn at a point on the curve.
Keywords
Gradient - The gradient on a graph represents the rate at which one quantity changes relative to another.
Rate of reaction - Rate of reaction is the speed with which a chemical reaction takes place.
Excess - A reactant in excess is present in a greater amount than is necessary to completely react with the limiting reactant.
Mean rate of reaction - The mean rate of reaction is the average rate at which reactants are converted into products in a given time.
Tangent - A tangent is a straight line that touches a curve at exactly one point without crossing it.
Common misconception
Thinking that as the concentration of a solution in excess changes, so does the volume of gas produced.
The slide deck uses graphical data to show that the same volume of gas is produced when different concentrations are used, so long as the reacting solution is in excess.
Equipment
Graph paper, ruler (to draw tangent) and calculator.
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).
Lesson video
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