Evaluating methods for measuring the rate of reaction
I can compare different methods for measuring the effect of concentration on the rate of reaction and suggest improvements.
Evaluating methods for measuring the rate of reaction
I can compare different methods for measuring the effect of concentration on the rate of reaction and suggest improvements.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning 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.
- 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.
Keywords
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 misconception
Adding a bung to the top of a conical flask does not affect volume measurements.
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.
To help you plan your year 10 chemistry lesson on: Evaluating methods for measuring the rate of reaction, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 10 chemistry lesson on: Evaluating methods for measuring the rate of reaction, 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.
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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.
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Lesson video
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Starter quiz
6 Questions
occurs when an instrument does not reset to zero
is caused by the equipment used
occurs when a measurement is not taken at eye-level
made by the investigator such as timing incorrectly