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.
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.
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.
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.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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