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chemistry > topic 3 > Flashcards

topic 3 Flashcards

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1
Q

what is oxidation in terms of electrons

A

loss

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2
Q

what is reduction in terms of electrons

A

gain

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3
Q

what is a redox reaction

A

reduction and oxidation

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4
Q

what are reducting agents

A

lose electrons and are oxidised themselves

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5
Q

what are oxidising agents

A

gain electrons and reduced themselves

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6
Q

what is the oxidation number of an uncombined element

A

0

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7
Q

what is the oxidation number of an ion

A

same as charge on ion
Cl- = -1

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8
Q

what is the oxidation number on group 1

A

+1

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9
Q

what is the oxidation number of group 2

A

+2

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10
Q

what is the oxidation number on aluminium

A

+3

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11
Q

what is the oxidation number of hydrogen

A

+1
except in hydrides -1 NaOH

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12
Q

what is the oxidation number of chlorine

A

-1
except with F and O its positive

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13
Q

what is the oxidation number of flurine

A

-1

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14
Q

what is the oxidation number of oxygen

A

-2
except -1 in peroxides
+2 in OF2

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15
Q

what is the name and oxidation states of Fe2O3

A

Fe +3
O -2

iron (III) oxide

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16
Q

what is the name and oxidation states of VO^2+

A

V +4
O -2
Vanddium (IV) oxide

17
Q

what is the name and oxidation states of VO2^+

A

V +5
O -2
vanddium (V) oxide

18
Q

what happens to the oxidation number if reduced

A

decreases

19
Q

what happens to the oxidation number if oxidised

A

increases

20
Q

what is a disproportionation reaction

A

element simultaneously oxidised and reduced

21
Q

how to balance half equations

A
  1. write down the species before and after a reaction
  2. balance any atoms apart from oxygen and hydrogen
  3. balance any oxygens with H2O
  4. balance any hydrogens with H+ ions
  5. balance charges with electrons e-
22
Q

how to combine half equation

A

make full ionic

  1. make sure electrons of both equations balance
    - multiply so they match
  2. cancel the electrons and combine

chemistry (15 decks)

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