Year 11 - Science
Concentration and rate: analysis
Rate of reaction
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores factors influencing reaction rates, including temperature, concentration, surface area, and catalysts. It covers using models and theories to develop hypotheses, planning and conducting experiments safely, selecting appropriate techniques, and presenting and translating data.
Lesson Summary
You will learn to represent graphically and explain how the rate of reaction depends on the concentration of one of the reactants.
Key Notes
- 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.
Vocabulary To Learn
- 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 Mistakes To Avoid
- Thinking that as the concentration of a solution in excess changes, so does the volume of gas produced.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key 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.
2. Define this scientific word and use it in context. 'gradient'
The gradient on a graph represents the rate at which one quantity changes relative to another. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Thinking that as the concentration of a solution in excess changes, so does the volume of gas produced. Correction: 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.
More Lessons In This Unit
- Appropriate equipment for measuring the rate of a reaction Study Guide
- Catalysts and rate Study Guide
- Collision theory Study Guide
- Concentration and rate: practical using end point method Study Guide
- Concentration and rate: practical using gas collection method Study Guide
- Evaluating methods for measuring the rate of reaction Study Guide
- Surface area and rate: analysis Study Guide
- Surface area and rate: practical Study Guide
- Temperature and rate: practical Study Guide
- The rate of a chemical reaction: including graphs Study Guide
Browse all guides in the Year 11 Science guide library.