O LevelChemistryCambridge (CIE)Exam Questions9. Metals9.5 Corrosion of Metals

Corrosion of Metals (Cambridge (CIE) O Level Chemistry): Exam Questions

Exam code: 5070

45 mins10 questions

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9.5 Corrosion of Metals

1a
1 mark

Six steel rods of the same size were placed in solutions of different pH for one week.

The percentage corrosion of the rods was measured and the results plotted on the grid below.

A grid with pH of solution on the horizontal axis, labelled 0, 1, 5 and 6, and percentage corrosion of steel rod on the vertical axis, labelled 0, 10, 20 and 30. Six crosses are plotted and fall from left to right: at pH 1 about 32.5, pH 2 about 27, pH 3 about 21.5, pH 4 about 16, pH 5 about 8.5 and pH 6 about 5. No line is drawn through them.

Draw a best fit straight line through the points.

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1b
1 mark

Why were the steel rods the same size?

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1c
1 mark

State one other variable which should have been kept constant.

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1d
1 mark

State one conclusion that could be drawn from the results.

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1e
1 mark

Determine the percentage corrosion of a steel rod in a solution of pH 6.5.

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