Redox Reactions (Grade 11 NSC Matric Physical Sciences): Quizzes

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Redox Reactions
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What happens to an atom during oxidation?

It loses electrons

What happens to an atom during reduction?

It gains electrons

What is the oxidation number of bromine in Br2\text{Br}_2?

0

What is the oxidation number of oxygen in hydrogen peroxide (H2O2\text{H}_2\text{O}_2)?

-1

In a reaction, an element's oxidation number changes from +2 to +5. What has occurred?

Oxidation

What is the oxidation number of sulfur in the sulfate ion (SO42−\text{SO}_4^{2-})?

+6

What does a half-reaction represent?

Either oxidation or reduction only

In a redox reaction, what is an element that is oxidised called?

Reducing agent

What type of reaction is Cu2+(aq)+Zn (s)→Cu (s)+Zn2+(aq)\text{Cu}^{2+}\text{(aq)} + \text{Zn (s)} \to \text{Cu (s)} + \text{Zn}^{2+}\text{(aq)}?

Displacement reaction

In the mnemonic OIL RIG, what does OIL stand for?

Oxidation is Loss

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