GCSE Chemistry - Oxidation and Reduction - Redox Reactions #39 (Higher Tier)

The video tutorial covers redox reactions, where oxidation and reduction occur simultaneously. It explains oxidation as the gain of oxygen or loss of electrons, and reduction as the loss of oxygen or gain of electrons, using the mnemonic 'oil rig'. Examples include magnesium reacting with acid and displacement reactions like calcium displacing iron. The tutorial also covers writing ionic and half equations, focusing on electron transfer and charge balance.

What does the mnemonic 'OIL RIG' stand for in the context of redox reactions?

• Oxidation is gain, reduction is loss

• Oxidation is loss, reduction is gain

• Oxidation involves light, reduction involves gravity

• Oxidation is light, reduction is gravity

In a redox reaction involving magnesium and dilute acid, what happens to the magnesium atoms?

• They lose protons and form magnesium gas

• They gain protons and form magnesium ions

• They lose electrons and form magnesium ions

• They gain electrons and form magnesium gas

What is a displacement reaction?

• A reaction where a metal is oxidized by oxygen

• A reaction where a less reactive metal displaces a more reactive one

• A reaction where a more reactive metal displaces a less reactive one

• A reaction where two metals combine to form a compound

What are spectator ions in an ionic equation?

• Ions that participate in the reaction

• Ions that change their charge during the reaction

• Ions that are formed as a product of the reaction

• Ions that do not participate in the reaction

How do you ensure the balance of charges in a half equation?

• By changing the state of the reactants

• By adding or removing electrons to balance the charges

• By ensuring the number of atoms is equal on both sides

• By adding protons to the equation