Oxidation & ReductionHESI A2 cheat sheet

Electrons moving

7 key facts 1 practice questions Reviewed Oct 2026

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Definitions

Oxidation — LOSS of electrons
Reduction — GAIN of electrons
OIL RIG — Oxidation Is Loss, Reduction Is Gain

Paired

They always happen together — a redox reaction
The reducing agent is oxidized; the oxidizing agent is reduced

In The Body

Cellular respiration is a redox process — glucose is oxidized, oxygen reduced

Examples

Rusting, combustion, batteries

Key takeaway

Electrons moving

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Question 1 of 1

Oxidation is best defined as:

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