Oxidation and Reduction (Oxygen Gain and Loss) Flashcards

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In terms of oxygen, what does oxidation mean?

Oxidation is when a substance gains oxygen.

In terms of oxygen, what does reduction mean?

Reduction is when a substance loses oxygen.

When a metal reacts with oxygen, what type of compound is formed?

A metal reacting with oxygen forms a metal oxide, and the metal has been oxidised.

In the reaction magnesium + oxygen → magnesium oxide, which substance is oxidised, and why?

Magnesium is oxidised because it gains oxygen to form magnesium oxide.

In the reaction copper(II) oxide + hydrogen → copper + water, which substance is reduced, and why?

Copper(II) oxide is reduced because it loses oxygen to form copper.

In the reaction copper(II) oxide + hydrogen → copper + water, which substance is oxidised, and why?

Hydrogen is oxidised because it gains oxygen to form water.

What is a redox reaction in terms of oxygen?

A redox reaction is one where one substance gains oxygen and another loses oxygen.

What is an oxidising agent in terms of oxygen?

An oxidising agent gives oxygen to another substance, causing that substance to be oxidised.

What is a reducing agent in terms of oxygen?

A reducing agent removes oxygen from another substance, causing that substance to be reduced.

Why do oxidation and reduction always happen together in a reaction?

Because when one substance gains oxygen, another substance must lose that oxygen.