Oxidation & Reduction in Terms of Electrons (AQA GCSE Chemistry): Flashcards

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Oxidation & Reduction in Terms of Electrons
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Key feature of redox reactions

Transfer of electrons between substances

Definition of oxidation

Loss of electrons from an atom or ion

Effect on oxidation state during oxidation

Oxidation state increases

Definition of reduction

Gain of electrons by an atom or ion

Effect on oxidation state during reduction

Oxidation state decreases

Oxidation & reduction in redox reactions

Always occur together

Na oxidation state change: Na to Na+Na^+

0 to +1

What happens to Na in \ceNa+Cl2−>NaCl\ce{Na + Cl2 -> NaCl}

Oxidised (loses one electron)

Cl oxidation state change: \ceCl2\ce{Cl2} to Cl−Cl^-

0 to -1

What happens to Cl in \ceNa+Cl2−>NaCl\ce{Na + Cl2 -> NaCl}

Reduced (gains one electron)

Definition of oxidation state

Total number of electrons an atom has gained or lost

How to identify a redox reaction

Change in oxidation state of any element

Examples of redox processes

Corrosion, metal extraction, combustion

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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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