Lesson 7: Oxidation, Reduction and Displacement

Question 1

OILRIG

Description

Answer 1

• Oxidation is Loss, Reduction is Gain (of electrons).
• Eg. Cu2+ + Mg ~> Cu + Mg2+

Cu shows reduction; Mg shows oxidation.

Question 2

OILRIG

Oxidation

Answer 2

• Loss of electrons.
• Atoms ~> (+) ions.
• (-) ions ~> atoms.

Eg. Mg(s) ~> Mg2+(aq) + 2e-

Question 3

OILRIG

Reduction

Answer 3

• Gain of electrons.
• Atoms ~> (-) ions.
• (+) ions ~> atoms.

Eg. Cu2+(aq) + 2e- ~> Cu(s)

Question 4

Displacement

Description

Answer 4

• When a more reactive element displaces a less reactive element from its compound.
• More reactive metals can be used to extract other metals from compound/ores.

Question 5

Displacement

Reactivity Series

Elements

Answer 5

• Potassium (K)
• Sodium (Na)
• Calcium (Ca)
• Magnesium (Mg)
• Aluminium (Al)
• Carbon (C)
• Zinc (Zn)
• Iron (Fe)
• Tin (Sn)
• Lead (Pb)
• Hydrogen (H)
• Copper (Cu)
• Silver (Ag)
• Gold (Au)
• Platinum (Pt)

It is best to have this memorised.