CAIE IGCSE Chemistry 9.5 Corrosion of Metals Topic Practice

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Covered syllabus points

9.5.1—Conditions required for the rusting of9.5.2—Some common barrier methods9.5.3—Barrier methods prevent rusting by9.5.4—Use of zinc in galvanising as an9.5.5—Sacrificial protection in terms of the

Question 1

[Maximum number: 1]

The diagrams show experiments to investigate rusting of iron nails.

Figure for Question 1 — CAIE IGCSE Chemistry

In which test-tubes do the nails rust?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

1 only

Question 2

[Maximum number: 5]

Iron is manufactured in a blast furnace.

Question (a)

(a)

Preventing the rusting of steel is important.

State the chemical name of rust.

[ 1 ]

Question (b)

(b)

Steel can be coated with zinc to prevent rusting. This provides both a barrier method and sacrificial protection.

[ 4 ]

Question (i)

(i)

State the term used for coating steel with zinc.

[ 1 ]

Question (ii)

(ii)

Describe another barrier method for preventing rusting.

[ 1 ]

Question (iii)

(iii)

Explain how zinc provides sacrificial protection.

[ 2 ]

Question 3

[Maximum number: 1]

Iron rusts in the presence of oxygen and water.
Which statements about the rusting of iron are correct?

1 Anhydrous iron(II) oxide is produced when iron rusts.
2 Iron rusts more quickly when attached to a piece of zinc.
3 Coating the iron with plastic prevents the iron from rusting.
4 Iron loses electrons when it rusts.

A

1 and 2

B

1 and 4

C

2 and 3

D

3 and 4

Question 4

[Maximum number: 1]

Iron is manufactured in a blast furnace.

Steel can be coated with zinc to prevent rusting. This provides both a barrier method and sacrificial protection.

Describe another barrier method for preventing rusting.

Question 5

[Maximum number: 1]

This question is about metals.

Zinc is used to coat iron to prevent rusting.

Name the process used to coat iron with zinc as a method of rust prevention.

Question 6

[Maximum number: 2]

This question is about metals.

Zinc is used to coat iron to prevent rusting.

When the zinc coating is scratched, the iron underneath does not rust.

Explain why the iron underneath the zinc does not rust.

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