What is oxidation (in terms of electrons)?

Oxidation is the loss of electrons.

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What is reduction (in terms of electrons)?

Reduction is the gain of electrons.

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What is a redox reaction?

A redox reaction is a reaction in which both oxidation and reduction take place.

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What is a useful phrase to help remember oxidation and reduction (but only in terms of electrons)?

OIL RIG


Oxidation is loss (of electrons)


Reduction is gain (of electrons)

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What is a metal displacement reaction?

Metal displacement is where a more reactive metal displaces a less reactive metal in a compound.

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What is a half equation?

A half equation is an equation that shows the gain or loss of electrons of a single element in a reaction.


As an example, the half equation for the reduction of oxygen is:

O2 + 4e- ➔ 2O2-

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What is the half equation for the oxidation of magnesium?

Mg ➔ Mg2+ + 2e-

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In displacement reactions, are the metal ions reduced or oxidised?

In displacement reactions, the metal ions are reduced (they gain electrons).

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In displacement reactions, are the metal atoms reduced or oxidised?

In displacement reactions, the metal atoms are oxidised (they lose electrons).

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Describe what is shown in ionic equations.

In ionic equations, only the particles that react and the products they form are shown - the ions that don't change are ignored.

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What do we call ions that aren't involved in a chemical reaction?

Spectator ions.

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What is the ionic equation for this reaction: Mg + ZnCl2 ➔ MgCl2 + Zn

The chloride ions don't take part in the reaction so can be removed, this makes the equation: Mg + Zn2+ ➔ Mg2+ + Zn

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