6.3 Redox

Question 1

What is oxidation in terms of electrons?

Answer 1

Loss of Electrons

Question 2

What is reduction in terms of electrons?

Answer 2

Gain of Electrons

Question 3

What is oxidation in terms of hydrogen?

Answer 3

Loss of Hydrogen

Question 4

What is reduction in terms of hydrogen?

Answer 4

Gain of Hydrogen

Question 5

What is oxidation in terms of oxygen?

Answer 5

Gain of Oxygen

Question 6

What is reduction in terms of oxygen?

Answer 6

Loss of Oxygen

Question 7

Define a ‘redox’ reaction

Answer 7

A redox reaction is where oxidation and reduction take place together at the same time in the same reaction

Question 8

What is the oxidation number of any uncombined element? (eg. H₂ & O₂)

Answer 8

Zero

Question 9

What is the oxidation number of any monoatomic ion? (eg. Zn²⁺ & Fe³⁺)

Answer 9

The same as the charge

Question 10

What is the sum of oxidation numbers in a compound equal to? (eg. NaCl)

Answer 10

Zero (Na = +1) (Cl = -1)

Question 11

Define an oxidising agent

Answer 11

An oxidising agent is a substance that oxidises another substance, and becomes reduced in the process

Question 12

Define a reducing agent

Answer 12

A reducing agent is a substance that reduces another substance, and becomes oxidised in the process