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A-Level Chemistry > Redox Reactions > Flashcards

Redox Reactions Flashcards

1
Q

What is oxidation?

A

It is the loss of electrons

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2
Q

What is reduction?

A

It is the gain of electrons

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3
Q

What happens in a redox reaction?

A

Electrons are transferred

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4
Q

What is an oxidising agent?

A

It accepts electrons and gets reduced

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5
Q

What is a reducing agent?

A

It donates electrons and gets oxidised

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6
Q

What is the oxidation state of uncombined elements?

A

0

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7
Q

What is the oxidation state of elements bonded to identical atoms?

A

0

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8
Q

What is the oxidation state of a simple monoatomic ion?

A

The oxidation state is the same as its charge

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9
Q

What is the overall oxidation state of compound ions?

A

The ion charge of the compound ion

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10
Q

What is the sum of the oxidation states for a neutral compound?

A

0

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11
Q

What is the oxidation state of group 1 metals?

A

+1

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12
Q

What is the oxidation state of group 2 metals?

A

+2

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13
Q

What is the oxidation state of aluminium?

A

+3

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14
Q

What is the oxidation state of H?

A

+1 except in metal hydrides where it is -1

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15
Q

What is the oxidation state of F?

A

-1

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16
Q

What is the oxidation state of Cl, Br and I?

A

-1 except in compounds with oxygen and fluorine

17
Q

What is the oxidation state of O?

A

-2 except in peroxides(H2O2) where it is -1 and in compounds with fluorine

18
Q

What method can be applied when trying to balance redox equations?

A
  1. Write out the reagents and products
  2. Balance the reagents and products
  3. Add water to balance the oxygens
  4. Add H+ ions to balance the hydrogens
  5. Add electrons to balance the charge
19
Q

What method can be applied when writing half equations?

A
  1. Work out the oxidation numbers for each element
  2. Add electrons equal to the oxidation number
  3. Check that the sum of the charges is equal on either side
20
Q

What method can be applied when combining half equations?

A
  1. Multiply the half equations to get an equal number of electrons
  2. Combine the half equations and cancel out the electrons
21
Q

What do roman numerals show in a chemical name?

A

They show the oxidation states

A-Level Chemistry (30 decks)

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