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A Level Chemistry > 3.1.7 Oxidation, Reduction and Redox Equations > Flashcards

3.1.7 Oxidation, Reduction and Redox Equations Flashcards

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1
Q

Define redox reaction

A

When reduction and oxidation happens in the same equation or reaction

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2
Q

What are the three things that happen in oxidation?

A
  • Loss of electrons
  • Gain of oxygen
  • Loss of hydrogen
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3
Q

What are the three things that happen in reduction?

A
  • Gain of electrons
  • Loss of oxygen
  • Gain of hydrogen
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4
Q

What is OILRIG?

A

Oxidation Is Loss, Reduction Is Gain

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5
Q

What is LEO?

A

Loss, Electrons, Oxidation

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6
Q

Where do you gain electrons in reduction equations?

A

The left.

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7
Q

Where do you gain electrons for oxidation reactions?

A

The right.

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8
Q

What are oxidation states?

A

They are assigned to atoms in molecules or ions to show how many electrons the atom has used in bonding.

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9
Q

What is the oxidation state for an atom in an element always?

A

0

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10
Q

What are the oxidation states of Fe, Cl2 and K?

A

0

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11
Q

What is the oxidation state for a simple ion?

A

Its charge

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12
Q

What are the oxidation states for Fe2+, Fe3+ and Cl-?

A

+2, +3 and -1.

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13
Q

What groups have a fixed oxidation state?

A

Group 1, 2 and 3.

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13
Q

What groups have a fixed oxidation state in their compounds?

A

Group 1, 2 and 3.

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14
Q

What is the oxidation state of group one?

A

+1

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15
Q

What is the oxidation state of group 2?

A

+2

16
Q

What is the oxidation state for group 3?

A

+3

17
Q

What is the fixed oxidation state of fluorine?

A

-1

18
Q

Why does fluorine have a fixed oxidation state?

A

Because its the most electronegative element, its able to pull electrons to itself.

19
Q

What is the oxidation state for oxygen nearly always?

A

-2

20
Q

When would oxygen have a different oxidation state?

A

When it’s with fluorine or in hydrogen peroxide.

21
Q

Usually what is the oxidation state of chlorine in a compound?

A

-1

22
Q

When does the oxidation state of chlorine differ?

A

When it’s with fluorine and/or oxygen.

23
Q

Usually what is the oxidation state of hydrogen?

A

+1

24
Q

When does the oxidation state of hydrogen differ and what is it then?

A

When it’s bonded to a metal, it’s -1.

25
Q

What is the sum of the oxidation states of all the atoms and ions in a compound?

A

0

26
Q

What is the sum of the oxidation states in a polyatomic ion?

A

The charge of the ion.

A Level Chemistry (26 decks)

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