Year 11 - Science
Evaluating methods for measuring the rate of reaction
Rate of reaction
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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 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 compare different methods for measuring the effect of concentration on the rate of reaction and suggest improvements.
Key Notes
- Measuring volume of gas produced throughout a reaction allows the changing rate of reaction to be calculated.
- Errors in measuring volumes of gas over time include timing, reading volumes in real time and gas displaced by the bung.
- Measuring an end-point in a reaction allows direct and simple comparison of reaction rates.
- Errors in measuring end-points include subjectivity of observations, measuring times and volumes, and contamination.
Vocabulary To Learn
- accuracy: Accuracy refers to how close a measured value is to the true or standard value.
- repeatable: A method is described as repeatable if a person uses the same method and obtains the same/similar results when repeating the experiment.
- parallax error: A parallax error occurs when a measurement is not taken at eye-level.
- systematic error: A systematic error is caused by the equipment used.
Common Mistakes To Avoid
- Adding a bung to the top of a conical flask does not affect volume measurements.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Measuring volume of gas produced throughout a reaction allows the changing rate of reaction to be calculated. Errors in measuring volumes of gas over time include timing, reading volumes in real time and gas displaced by the bung.
2. Define this scientific word and use it in context. 'accuracy'
Accuracy refers to how close a measured value is to the true or standard value. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Adding a bung to the top of a conical flask does not affect volume measurements. Correction: The bung can displace a small volume of gas, which can affect the accuracy of the measurements. It is essential to account for the volume displaced by the bung in calculations.
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: analysis Study Guide
- Concentration and rate: practical using end point method Study Guide
- Concentration and rate: practical using gas collection method 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
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