Form 5 chemistry - Chapter 1 Redox

Front

What is a reducing agent?

Back

A reducing agent is a substance that donates electrons in a chemical reaction, causing another substance to be reduced.

Front

Identify the electrode that contains the plating metal in electroplating.

Back

The electrode that contains the plating metal is called the anode.

Front

What is the role of zinc in protecting the hull of ships from rusting?

Back

Zinc acts as a sacrificial anode, corroding in place of the iron hull to prevent rust.

Front

List three reasons for metal plating.

Back

1. Decorative purposes 2. Prevent rust and corrosion 3. Improve conductivity

Front

What does the term 'oxidation' refer to in a redox reaction?

Back

Oxidation refers to the loss of electrons by a substance.

Front

What does the term 'reduction' refer to in a redox reaction?

Back

Reduction refers to the gain of electrons by a substance.

Front

In the reaction Al + 3Ag+ → Al3+ + 3Ag, which substance is oxidized?

Back

Aluminium (Al) is oxidized.

Front

In the reaction Al + 3Ag+ → Al3+ + 3Ag, which substance is reduced?

Back

Silver ion (Ag+) is reduced.

Front

What is the difference between anode and cathode?

Back

Anode is the electrode where oxidation occurs, while cathode is where reduction occurs.

Front

What is the significance of the ionic equation in redox reactions?

Back

Ionic equations show the actual species involved in the reaction, highlighting electron transfer.