Potato cells contain the enzyme catalase.
This enzyme catalyses the breakdown of hydrogen peroxide into oxygen and water.
Figure 10 shows what happened when a studen... show full transcript
Worked Solution & Example Answer:Potato cells contain the enzyme catalase - Edexcel - GCSE Biology Combined Science - Question 5 - 2018 - Paper 1
Step 1
Which term describes the hydrogen peroxide in this reaction?
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Answer
The term that describes the hydrogen peroxide in this reaction is B substrate. In this context, the hydrogen peroxide is the substance on which the enzyme acts.
Step 2
The potato discs all had the same mass. Explain why the student used potato discs with the same mass.
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Answer
Using potato discs of the same mass ensures that the surface area exposed to the hydrogen peroxide is consistent across all experiments. This helps to eliminate mass as a variable and ensures that any differences in the reaction observed can be attributed to the concentration of the hydrogen peroxide, not differing amounts of potato tissue.
Step 3
Calculate the rate of reaction for the 25% hydrogen peroxide solution.
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Answer
To calculate the rate of reaction, we use the formula:
extRate=Time1
Given that the time taken is 75 seconds, the rate of reaction is:
extRate=751=0.0133 s−1
Step 4
Give the reason why the result was not anomalous.
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The result for the 25% hydrogen peroxide solution was not anomalous because the rate of reaction observed aligns with expected results based on the concentration of hydrogen peroxide. Since the experiment maintained controlled conditions, it suggests that there were no unexpected influences affecting the reaction.
