Year 10 - Science
The effect of temperature on the rate of decomposition by an enzyme: data analysis and evaluation
Living organisms and their environments
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores ecosystem organisation, biotic and abiotic factors, material cycling, and the role of decomposers. It covers methods for identifying species and measuring their distribution. Emphasis is on selecting appropriate techniques, accurate measurements, sampling, and fieldwork practices.
Lesson Summary
You will learn to analyse, explain and evaluate the results of an experiment investigating how temperature affects the rate of decomposition of milk by an enzyme.
Key Notes
- Calculate rate of reaction where rate = 1/time taken to reach the end point.
- Plot a graph of results (x-axis = temperature and y-axis = rate, or time taken to reach end point).
- Interpret the results and evaluate how well they support the hypothesis.
- Explain the results using ideas about the effect of temperature on the rate of enzyme activity.
Vocabulary To Learn
- rate: The rate is how quickly something takes place. The rate of a reaction is a measure of how much change occurs per unit of time.
- end point: The point at which a reaction is complete, often indicated by a change in colour of an indicator.
- hypothesis: A precise, measurable and testable statement based on observations about how something works.
- active site: The part of an enzyme where the substrate binds.
- denature: A permanent change in the shape of an enzyme which stops it from working.
Common Mistakes To Avoid
- As pH increases above the optimum, enzymes denature and reaction rate falls; but this is not what happens at pHs below the optimum, so the graph and explanation resemble temperature.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Calculate rate of reaction where rate = 1/time taken to reach the end point. Plot a graph of results (x-axis = temperature and y-axis = rate, or time taken to reach end point).
2. Define this scientific word and use it in context. 'rate'
The rate is how quickly something takes place. The rate of a reaction is a measure of how much change occurs per unit of time. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: As pH increases above the optimum, enzymes denature and reaction rate falls; but this is not what happens at pHs below the optimum, so the graph and explanation resemble temperature. Correction: The process of denaturing an enzyme is explored in detail, and a graph of reaction rate is explained carefully to make it clear that the changes to rate occur above and below the optimum pH.
More Lessons In This Unit
- Competition and adaptations in ecosystems Study Guide
- Components of an ecosystem Study Guide
- Estimating population size and distribution using transects: practical Study Guide
- Estimating population size using quadrats: practical Study Guide
- Factors affecting the rate of decomposition Study Guide
- Material cycles: the carbon cycle Study Guide
- Material cycles: the water cycle Study Guide
- Measuring the size and distribution of populations of organisms Study Guide
- The effect of temperature on the rate of decomposition by an enzyme: practical Study Guide
- The role of microorganisms in decomposition Study Guide
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