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AL Chemistry (Edexcel) 2024 MT > TOPIC 3 - Redox I > Flashcards

TOPIC 3 - Redox I Flashcards

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1
Q

What is oxidation in terms of electrons and oxidation number?

A

Loss of electrons. Increase in oxidation number.

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2
Q

What is reduction in terms of electrons and oxidation number?

A

Gain of electrons. Decrease in oxidation number.

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3
Q

What is a redox reaction?

A

A reaction where there’s both oxidation and reduction taking place?

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4
Q

What happens to oxidising agents in terms of electrons and reduction/oxidation?

A

They are reduced, so they gain electrons.

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5
Q

What happens to reducing agents in terms of electrons and reduction/oxidation?

A

They are oxidised, so loose electrons.

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6
Q

What is the rule for oxidation numbers in uncombined elements?

A

Oxidation number is 0.

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7
Q

What is the rule for oxidation numbers in ions?

A

Oxidation number = charge of the ion.

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8
Q

What is the rule for oxidation numbers in Group 1?

A

Always +1

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9
Q

What is the rule for oxidation numbers in Group 2?

A

Always +2

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10
Q

What is the rule for oxidation numbers in Group 3?

A

Always +3

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11
Q

What is the rule for oxidation numbers in Hydrogen?

A

+1 except in hydrides (-1), like in NaH.

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12
Q

What is the rule for oxidation numbers in Chlorine?

A

-1 except with F and O

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13
Q

What is the rule for oxidation numbers in Fluorine?

A

Always -1.

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14
Q

What is the rule for oxidation numbers in Oxygen?

A

-2 except in peroxides (-1) and OF2 (+2)

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15
Q

What should all the oxidation states in a molecule must add up to?

A

The charge of the molecule

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16
Q

What is a disproportionation reaction?

A

A reaction where the same species is simultaneously oxidised and reduced.

17
Q

What are the steps to follow when balancing half equations?

A
  1. Write species in the equation.
  2. Balance atoms. (apart from H and O)
  3. Balance any oxygens with H2O
  4. Balance any hydrogens with H+
  5. Balance charges with electrons.
18
Q

How do you combine already balanced half equations into a whole equation?

A

Multiply equations so that they have the same number of electrons.

Combine equations and eliminate electrons.

19
Q
A

AL Chemistry (Edexcel) 2024 MT (20 decks)

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