Question

Three cubes of 10 mm × 10 mm × 10 mm of sweet potato were used.
Cube 1 was placed into the test-tube and 5cm3 of hydrogen peroxide was added.
The bung was quickly replaced into the top of the test-tube.
The students carefully counted the number of bubbles of oxygen delivered into the water in one
minute and then measured the fi nal height of foam in the test-tube.
For cube 1, they counted 12 bubbles in one minute. The height of foam is shown in Fig. 1.2.
They then discarded the contents of the test-tube and rinsed it with clean water.
Cube 2 was cut into two pieces of approximately the same size.
Both of these pieces were placed into the test-tube and 5 cm3 of hydrogen peroxide was added as
before.
For cube 2, they counted 23 bubbles in one minute. The height of foam is shown in Fig. 1.2.
They then discarded the contents of the test-tube and rinsed it with clean water.
Cube 3 was cut into eight small pieces which were all placed into the test-tube and 5 cm3 of
hydrogen peroxide was added as before.
For cube 3, they counted 38 bubbles in one minute. The height of foam is shown in Fig. 1.2.

Answer 1

Answer:

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Explanation:

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