Oxidation & Reduction in Terms of Electrons (OCR GCSE Chemistry A (Gateway Science Suite)): Flashcards

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Oxidation & Reduction in Terms of Electrons
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Definition of a redox reaction

Reaction involving transfer of electrons between substances

Definition of oxidation

Loss of electrons from an atom or ion

Effect on oxidation state when a substance is oxidised

Oxidation state increases

Definition of reduction

Gain of electrons by an atom or ion

Effect on oxidation state when a substance is reduced

Oxidation state decreases

Relationship between oxidation & reduction in redox reactions

Always occur together - one substance oxidised, another reduced

Oxidation state of Na before reaction with Cl2Cl_2

00

Oxidation state of Na after reaction with Cl2Cl_2

+1+1

Oxidation state of Cl2Cl_2 before reaction with Na

00

Oxidation state of Cl after reaction with Na

−1-1

Definition of oxidation state

Number representing total electrons an atom has gained or lost

How to identify a redox reaction

Change in oxidation state of any elements

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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