Identify oxidising and reducing agents

A clean piece of aluminium metal strip is placed in a copper sulphate (${\text{CuSO}}_4$) solution. The reaction was observed again after 2 hours.

After 2 hours it was observed that the blue solution turned colourless and the shiny metallic aluminium turned brown.

The net ionic balanced equation for the reaction is given below:

$2\text{Al (s)}+3{\text{Cu}}^{2+}\text{(aq)}\to 3\text{Cu (s)}+2{\text{Al}}^{3+}\text{(aq)}$

9.2 Write down the chemical symbol of a substance that is ...

8.1 A solution of nickel (II) nitrate is placed in a zinc container. It was observed, after some time, that a chemical reaction has taken place. The net ionic equation is:

$\text{Zn(s)}+{\text{Ni}}^{2+}\text{(aq)}\rightleftharpoons {\text{Zn}}^{2+}\text{(aq)}+\text{Ni(s)}$

The letters A to G in the table below represent organic compounds.

2.3 Compound E, ${\text{C}}_3{\text{H}}_8$(g), reacts with oxygen, ${\text{O}}_2$(g), according to the balanced equation:

${\text{C}}_3{\text{H}}_8\text{(g)}+5{\text{O}}_2\text{(g)}\to 3{\text{CO}}_2\text{(g)}+4{\text{H}}_2\text{O(g)}$

Initially $8$ cm${}^3$ of compound E and $50$ cm${}^3$ of oxygen were injected into a container of adjustable volume and allowed to react, as shown below.

Answer the questions that follow.

8.1 Dilute hydrochloric acid, HCℓ(aq), reacts with magnesium, Mg(s), at $25$ °C according to the following balanced equation:

$\text{Mg(s)}+2\text{HC}\ell \text{(aq)}\to \text{MgC}{\ell }_2\text{(aq)}+{\text{H}}_2\text{(g)}$

Answer the questions that follow.