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Chemistry > Redox > Flashcards

Redox Flashcards

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1
Q

What is oxidation ?

A

Loss of electrons

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2
Q

What is reduction ?

A

Gain of electrons.

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3
Q

What is oxidation in terms of oxygen ?

A

Addition of oxygen.

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4
Q

What is reduction in terms of oxygen ?

A

Removal of oxygen

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5
Q

What is oxidation in terms of hydrogen ?

A

Loss of hydrogen

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6
Q

What is reduction in terms of hydrogen

A

Addition of hydrogen

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7
Q

What is the definition of a redox reaction ?

A

One substance is oxidised and another is reduced.

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8
Q

Give an example of a redox reaction.

A 
Thermite reaction. 
Iron Oxide (III) + Aluminium - Iron + Aluminium Oxide.

Aluminium is oxidised.
Iron is reduced.

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9
Q

What is an oxidation state/ number ?

A

An oxidation number of an element in a compound is the charge that’s the element would have if the compound was fully ionic.

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10
Q

What is the oxidation state for simple ions and give examples.

A

The oxidation state is the charge of the ion

Na1+ has an oxidation state +1
Mg2+ has an oxidation state +2

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11
Q

What is the oxidation state for atoms in elements and give examples.

A

Oxidation state is always zero.

Fe, Na, Cl2 , O2

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12
Q

What is the oxidation state of compounds ?

A

For all compounds the sum of oxidation states of each atom must equal zero.

Na = +1 
Cl = -1

NaCl=0

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13
Q

What is the oxidation state for complex ions ?

A

The sum of the oxidation numbers of the atoms is equal to the overall charge of the atom.

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14
Q

What is the oxidation state for all group 1 atoms ?

A

+1

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15
Q

What is the oxidation state for all group 2 atoms ?

A

+2

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16
Q

What is the oxidation state of Aluminium ?

A

+3

17
Q

What is the oxidation state of fluorine ? (f-)

A

-1

18
Q

What is the oxidation state for hydrogen (H+)

A

Usually +1 but -1 when bonded to a metal, Si or B

19
Q

What is the oxidation state of oxygen (O2) ?

A

Usually -2 but -1 when bonded with peroxides.

20
Q

When does the oxidation state of a hydrogen ion change from +1 to -1 ?

A

When it is bonded to a metal, Si or B

21
Q

When does the oxidation state of oxygen change from -2 to -1.

A

When bonded with peroxide’s.

22
Q

What happens to the oxidation number during oxidation ?

A

It increases

23
Q

What happens to the oxidation number during reduction ?

A

It decreases.

24
Q

What is an oxidising agent ?

A

Accepts electrons

25
Q

What is oxidation in terms of electrons ?

A

Loss of electrons

26
Q

What is reduction in terms of electrons ?

A

Gaining electrons

27
Q

What is a reduction agent?

A

Donates electrons

Chemistry (27 decks)

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