1. States of matter

1.1 Solids, liquids and gases

1.2 Diffusion

2. Atoms, elements and compounds

2.1 Elements, compounds and mixtures

2.2 Atomic structure and the Periodic Table

2.3 Isotopes

2.4 Ions and ionic bonds

2.5 Simple molecules and covalent bonds

2.6 Giant covalent structures

2.7 Metallic bonding

3. Stoichiometry

3.1 Formulae

3.2 Relative masses of atoms and molecules

3.3 The mole and the Avogadro constant

4. Electrochemistry

4.1 Electrolysis

4.2 Hydrogen–oxygen fuel cells

5. Chemical energetics

5.1 Exothermic and endothermic reactions

6. Chemical reactions

6.1 Physical and chemical changes

6.2 Rate of reaction

6.3 Reversible reactions and equilibrium

6.4 Redox

7. Acids, bases and salts

7.1 The characteristic properties of acids and bases

7.2 Oxides

7.3 Preparation of salts

8. The Periodic Table

8.1 Arrangement of elements

8.2 Group I properties

8.3 Group VII properties

8.4 Transition elements

8.5 Noble gases

9. Metals

9.1 Properties of metals

9.2 Uses of metals

9.3 Alloys and their properties

9.4 Reactivity series

9.5 Corrosion of metals

9.6 Extraction of metals

10. Chemistry of the environment

10.1 Water

10.2 Fertilisers

10.3 Air quality and climate

11. Organic chemistry

11.1 Formulae, functional groups and terminology

11.2 Naming organic compounds

11.3 Fuels

11.4 Alkanes

11.5 Alkenes

11.6 Alcohols

11.7 Carboxylic acids

11.8 Polymers

12. Experimental techniques and chemical analysis

12.1 Experimental design

12.2 Acid–base titrations

12.3 Chromatography

12.4 Separation and purification

12.5 Identification of ions and gases

IGCSE Chemistry 9.5 Corrosion of metals Question Bank

[Maximum number: 1]

This question is about the first 30 elements in the Periodic Table.
Name the element which:

(a)

is used to galvanise iron.

[ 1 ]

(a)

Iron rusts when it is in contact with oxygen and water.

[ 3 ]

(i)

Explain how sacrificial protection prevents rusting.

[ 2 ]

(ii)

State one other method of rust prevention.

[ 1 ]

[Maximum number: 4]

Tin is a metallic element in Group IV. Its main ore is cassiterite which is an impure form of tin(IV) oxide, $\mathrm{SnO}_{2}$ .
Tin also occurs in stannite, $\mathrm{Cu}_{2} \mathrm{FeSnS}_{4}$ .

(a)

Iron does not rust when it is completely coated with zinc. When the zinc is scratched, the iron still does not rust.

[ 4 ]

(i)

Explain why the iron does not rust when it is completely coated with zinc.

[ 1 ]

(ii)

Explain why the iron still does not rust when the zinc is scratched.

[ 3 ]

(a)

The metal iron and the alloy steel are commonly used materials. A problem with them is that they rust.

[ 4 ]

(i)

How does painting iron and steel prevent rusting?

[ 1 ]

(ii)

Magnesium blocks can be attached to the bottom of steel boats.

Explain how the magnesium blocks prevent the whole of the bottom of the boat from rusting.

[ 2 ]

(iii)

Replacing the magnesium blocks with copper blocks does not prevent rusting.

Explain why the copper blocks do not prevent rusting.
[Total: 10]

[ 1 ]

[Maximum number: 5]

Iron is manufactured in a blast furnace.

(a)

Preventing the rusting of steel is important.

State the chemical name of rust.

[ 1 ]

(b)

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

[ 4 ]

(i)

State the term used for coating steel with zinc.

[ 1 ]

(ii)

Describe another barrier method for preventing rusting.

[ 1 ]

(iii)

Explain how zinc provides sacrificial protection.

[ 2 ]

[Maximum number: 1]

Which statement explains why galvanising prevents iron from rusting?

Zinc is more reactive than iron and corrodes in preference to iron.

Zinc is more reactive than iron and loses electrons less easily than iron.

Zinc is less reactive than iron and corrodes in preference to iron.

Zinc is less reactive than iron and loses electrons more easily than iron.

[Maximum number: 1]

Mild steel is galvanised to prevent corrosion of the iron.
Which statements about galvanising are correct?
1 Galvanising prevents corrosion because the zinc forms an alloy.
2 If the coating is damaged, water and oxygen do not corrode the iron.
3 Zinc is a sacrificial metal and corrodes in preference to iron.

1 and 2

1 and 3

2 only

2 and 3

[Maximum number: 1]

This question is about metals and metal oxides.

(a)

Iron often rusts.

Name the two substances, other than iron, that must be present for iron to rust.

1

2

[ 1 ]

[Maximum number: 1]

Metal X acts as a sacrificial metal to prevent iron from corroding.
Metal X does not act as a sacrificial metal to prevent aluminium from corroding.

What is X ?

copper

magnesium

silver

zinc

[Maximum number: 1]

Three experiments, J, K and L, are set up to investigate rusting.

In which experiments does rusting occur?

key

$\checkmark$

$\checkmark=$ yes

$\checkmark$

$\boldsymbol{x}=$ no

$\checkmark$

0 selected

Question 1

Question 1(j)

Question 1

Question 1(b)

Question 1(b)(i)

Question 1(b)(ii)

Question 3

Question 3(g)

Question 3(g)(i)

Question 3(g)(ii)

Question 3

Question 3(b)

Question 3(b)(i)

Question 3(b)(ii)

Question 3(b)(iii)

Question 3

Question 3(e)

Question 3(f)

Question 3(f)(i)

Question 3(f)(ii)

Question 3(f)(iii)

Question 24

Question 24

Question 3

Question 3(b)

Question 25

Question 25