CAIE IGCSE Chemistry 9.5 Corrosion of Metals Topic Practice

CourseCourseConceptConceptDocumentDocument

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

All question bank results loaded