Redox

Question 1

Oxidation

Answer 1

• The gain of oxygen atoms
• The loss of hydrogen atoms
• Increase in oxidation number
• Loss of electrons

Question 2

Reduction

Answer 2

• The loss of oxygen atoms
• The gain of hydrogen atoms
• Decrease in oxidation number
• Gain of electrons

Question 3

Oxidizing agents

Answer 3

Substances that will oxidize other substances, itself getting reduced.

Question 4

Reducing agents

Answer 4

Substances that will reduce other substances, itself getting oxidised.

Question 5

Primary cells

Answer 5

Contain chemicals which undergo a redox reaction to produce an electric current but once the reactants are used up, the batteries are discarded.
1. They cannot be recharged
2. They are disposable

Question 6

Secondary cells

Answer 6

They contain chemicals to produce an electric current (spontaneous reaction - as in a galvanic cell.) But the good thing about this cell is that once the reactants have been used up they can be regenerated by a non-spontaneous reaction.

Question 8

Electrolysis of molten substances

Answer 8

The process where an electric current is supplied to break down an ionic compound.

Question 9

Why is electrolysis non spontaneous

Answer 9

Because energy is provided to carry out the experiment

Question 10

Electrolysis of aqueous solutions

Answer 10

Aqueous solutions contain ionic salts dissolved in water, an advantage of this electrolysis is that they can occur at room temperature,