Displacement reactions 2

Displacement reactions

Multiple Choice

If a metal is less reactive than carbon electrolysis is used to extract it, true or false?

• True

• False

Displacement reactions

• Use this example -

• Mary and Frank are copper oxide

• Joe is magnesium

• The magnesium (Joe) displaces the copper to become zinc oxide leaving the copper (Frank) alone.

Ionic equations

In this reaction the sulfate ions, SO₄^2-(aq), remain the same, so do not appear in the ionic equation. 

So the correct ionic equation is:

Mg_(s) + Cu²⁺_(aq) --> Mg²⁺_(aq) + Cu_(s)

This shows that magnesium atoms have a greater tendency to form positive ions than copper atoms (magnesium is more reactive)

Oxidation vs reduction

• This are the terms we use to describe the transfer of electrons i.e. oxidised ve reduced.

• Something that is oxidised loses electrons

• Something that is reduced gains them

• Look at the OILRIG mnemonic to help

Multiple Choice

Has the following been reduced or oxidised based on the loss or gain of electrons - remember OILRIG

Mg(s) --> Mg2+(aq) + 2e-

• Oxidised

• Reduced

Multiple Choice

Has the following been reduced or oxidised based on the loss or gain of electrons - remember OILRIG

Ca(s) --> Ca2+(aq) + 2e-

• Oxidised

• Reduced

Multiple Choice

Has the following been reduced or oxidised based on the loss or gain of electrons - remember OILRIG

Fe(s) --> Fe3+(aq) + 3e-

• Oxidised

• Reduced

Multiple Choice

Will a displacement reaction occur between Zinc sulphate and copper?

What is the correct word equation for this reaction

• Zinc sulphate + copper --> zinc + copper sulphate

• Zinc sulphate + copper --> zinc sulphate + copper

Multiple Choice

What is the correct definition of oxidation?

• The gaining of electrons

• The loss of electrons

Multiple Choice

What is the correct definition of reduction?

• The gaining of electrons

• The loss of electrons

Open Ended

Write the correct word equation for the following displacement reaction

Magnesium + iron sulphate -->

Open Ended

We can use a carbon to extract zinc from its oxide by displacing in, explain why we cannot use this method for magnesium.