5. 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 st... show full transcript
Worked Solution & Example Answer:5. 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
In this reaction, hydrogen peroxide is identified as the substrate. This is because the substrate is the substance that is acted upon by the enzyme catalase to produce oxygen and water.
Step 2
Explain why the student used potato discs with the same mass.
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Answer
The student used potato discs with the same mass to ensure a fair test. Using equal masses allows for consistent surface area and reactant availability, helping to control variables that could affect the rate of reaction. This ensures that any differences in the reaction rate can be attributed to the concentration of hydrogen peroxide, rather than variations in the amount of catalase present.
Step 3
Calculate the rate of reaction for the 25% hydrogen peroxide solution.
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Answer
The rate of reaction can be calculated using the formula:
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Answer
The result was not anomalous because the reaction time recorded was consistent with expected results from similar experiments. The measured time falls within a reasonable range for the reaction under controlled conditions, indicating that factors affecting the reaction were managed properly.
