Activity 1C:
Carry out this activity in groups.
Table 1.3 shows the chemical equations for two examples of redox reactions.
(a) Discuss why the reactions in Table 1.3 can be classified as redox reactions.
(b) For each reaction, identify the following:
(i) Oxidised and reduced substances.
(ii) Oxidising and reducing agents.
Present the outcome of your group discussion in your class in a Gallery Walk activity.
Answer:
CuO + H2 → Cu + H2O
(a) A redox reaction occurs because the oxidation number of copper in copper(II) oxide decreases from +2 to 0, while the oxidation number of hydrogen increases from 0 to +1.
(b)(i) H2 is oxidised and CuO is reduced.
(ii) Oxidising agent is CuO and reducing agent is H2.
Mg + 2HCl → MgCl2 + H2
(a) A redox reaction occurs because the oxidation number of magnesium increases from 0 to +2, while the oxidation number of hydrogen decreases from +1 to 0.
(b)(i) Mg is oxidised and HCl is reduced.
(ii) Oxidising agent is HCl and reducing agent is Mg.
Carry out this activity in groups.
Table 1.3 shows the chemical equations for two examples of redox reactions.
(a) Discuss why the reactions in Table 1.3 can be classified as redox reactions.
(b) For each reaction, identify the following:
(i) Oxidised and reduced substances.
(ii) Oxidising and reducing agents.
Present the outcome of your group discussion in your class in a Gallery Walk activity.
Answer:
CuO + H2 → Cu + H2O
(a) A redox reaction occurs because the oxidation number of copper in copper(II) oxide decreases from +2 to 0, while the oxidation number of hydrogen increases from 0 to +1.
(b)(i) H2 is oxidised and CuO is reduced.
(ii) Oxidising agent is CuO and reducing agent is H2.
Mg + 2HCl → MgCl2 + H2
(a) A redox reaction occurs because the oxidation number of magnesium increases from 0 to +2, while the oxidation number of hydrogen decreases from +1 to 0.
(b)(i) Mg is oxidised and HCl is reduced.
(ii) Oxidising agent is HCl and reducing agent is Mg.