Oxidation and Reduction Flashcards

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What does 'redox' mean?

A reaction where reduction and oxidation happen together.

What does oxidation mean in terms of oxygen?

A substance gains oxygen.

What does reduction mean in terms of oxygen?

A substance loses oxygen.

What does OIL RIG stand for in redox?

Oxidation Is Loss of electrons; Reduction Is Gain of electrons.

When a metal atom forms a positive ion, is it oxidised or reduced?

Oxidised, because it loses electrons.

In a displacement reaction, what happens to the more reactive metal?

It is oxidised. It loses electrons.

What is an oxidising agent?

A substance that causes another to lose electrons; it gains electrons and is reduced.

What is a reducing agent?

A substance that causes another to gain electrons; it loses electrons and is oxidised.

What is the half equation for the reduction of Cu2+ to copper metal?

Cu2+ + 2e- -> Cu.

What is the half equation for the oxidation of magnesium atoms to Mg2+ ions?

Mg -> Mg2+ + 2e-.

In extracting a metal using carbon, what happens to the metal oxide?

It is reduced. It loses oxygen to form the metal, while carbon is oxidised to carbon dioxide.

Is rusting a redox process, and what happens to iron?

Yes. Iron is oxidised. It reacts with oxygen and water to form iron oxide.