Question

(a) Two isotopes of iron are iron-54 and iron-56.

Both isotopes have a proton number of 26.

Iron-54 has a nucleon number of 54 and iron-56 has a nucleon number of 56.

(i) State the number of electrons in one atom of iron-54. (Sub-topic – C2.2)

▶️Answer/Explanation

Answer:
26

(ii) Determine the difference in the number of neutrons between an atom of iron-54 and an atom of iron-56. (Sub-topic – C2.3)

▶️Answer/Explanation

Answer:
2

(b) Iron is extracted from iron oxide using carbon monoxide. Carbon dioxide is also made. (Sub-topic – C6.3)

(i) Write the word equation for this reaction.

▶️Answer/Explanation

Answer:
Iron oxide + carbon monoxide → iron + carbon dioxide

(ii) State the substance that is oxidised in this reaction.

▶️Answer/Explanation

Answer:
Carbon monoxide

(c) Iron reacts with two other substances to make rust. (Sub-topic – C9.5)

(i) Name the element and the compound that react with iron when it rusts.

▶️Answer/Explanation

Answer:
Element: Oxygen
Compound: Water

(ii) Iron is coated with a material to prevent rusting.

Suggest one suitable material to use.

▶️Answer/Explanation

Answer:
Paint