3.1.7 Redox

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Last updated 4:27 PM on 8/24/26
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17 Terms

1
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What is the definition of oxidation & reduction?

  • Oxidation: the loss of electrons

  • Reduction: the gain of electrons


<ul><li><p><strong>Oxidation: </strong>the loss of electrons</p></li></ul><ul><li><p><strong>Reduction:</strong> the gain of electrons</p></li></ul><p></p>
2
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State in terms of electrons, the meaning of the terms oxidising & reducing agents

  • Oxidising agent: electron acceptor (oxidises another substance & becomes reduced itself)

  • Reducing agent: electron donor (reduces another substance & becomes oxidised itself)


3
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What is a redox reaction?

  • A reaction where both reduction & oxidation take place

  • Electrons are transferred from one element to another


4
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What is the definition of an oxidation state?

A number that represents the number of electrons lost or gained by an atom of that element in the compound

5
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What are the rules of oxidation states?

  • All elements have an oxidation number of 0

  • The oxidation number in a molecule is 0

  • The oxidation number of an ion is the same as its charge


6
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What does 123FHOCl mean?

  • Group 1 elements: always +1

  • Group 2 elements: always +2

  • Group 3 elements: always +3

  • Fluorine: -1

  • Hydrogen: +1

  • Oxygen: -2

  • Chlorine: -1


7
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What is the oxidation state of oxygen in OF2?

+2

8
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What is the oxidation state of hydrogen in KH?

-1

9
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What is the oxidation state of chlorine in NaClO?

+1

10
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What is the oxidation state of nitrogen in NH3?

-3

11
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What is the oxidation state of sulphur in H2S?

-2

12
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What is the oxidation state of oxygen in O2?

0

13
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Is reduction a decrease or increase in oxidation number?

Decrease

14
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Is oxidation an increase or decrease in oxidation number?

Increase

15
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How do you balance half equations?

  1. Write down the species before & after the reaction

  2. Balance any atoms apart from oxygen & hydrogen

  3. Balance any oxygens with H2O

  4. Balance any hydrogens with H+ ions

  5. Balance the charges with electrons


16
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What do you need to remember when combing 2 half equations to make a full ionic equation?

The electrons need to be balanced in both of the half equations & the final ionic equation should have no electrons

17
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What is a disproportionation reaction?

A reaction in which a single substance is both oxidised & reduced