Year 8 Science · Unit 3 · Lesson 12

Collecting and Interpreting Reaction Data

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Learning Goals

Warm Up

Because… chain

Fill in the missing effects. Each cause leads to the next step in the process of handling an anomalous result.

Reaction rate data is collected across three repeat trials at each temperature.
→
One data point at 40°C is far higher than the other two repeats.
→
The scientist checks their equipment calibration and measurement technique.
→
No equipment fault is found; the anomaly is confirmed as real.
→

Overall outcome:

Your Turn

Real-world context

A student investigates how temperature affects the rate of CO₂ production from yeast fermenting sugar solution. They measure the volume of CO₂ produced in 5 minutes at temperatures of 20°C, 30°C, 40°C, 50°C, and 60°C, with three repeats at each temperature. Their averaged results show a clear increase up to 40°C, then a sharp drop at 50°C and 60°C. However, one trial at 40°C produced only 3 mL of gas, compared to the other two readings of 18 mL and 19 mL at that temperature.

(a) Identify the anomalous data point and explain how you recognised it as an anomaly.

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(b) Suggest one likely cause for this anomalous result. Refer to the experimental context in your answer.

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(c) Should the anomalous result (3 mL) be included when calculating the average for 40°C? Explain your decision and state how including or excluding it would affect the average.

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Wrap Up

In one sentence, what was the main idea of this lesson?

HSCScience · Year 8 Science · Unit 3 · Lesson 12 · Apply Worksheet