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.
To help you plan your year 10 chemistry lesson on: Concentration and rate: analysis, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 10 chemistry lesson on: Concentration and rate: analysis, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 4 chemistry lessons from the Rate of reaction unit, dive into the full secondary chemistry curriculum, or learn more about lesson planning.
Equipment
Graph paper, ruler (to draw tangent) and calculator.