1.i - ( PAPER 2 ) Electrolyisis

Question 1

why do covalent compounds not conduct electricity

Answer 1

formed between non metal atoms

have no free electrons and no free ions

Question 2

can ionic compounds conduct electricity

Answer 2

yes only when molten or in aqueous solution

Question 3

why do ionic compounds only conduct electricity when molten or in a aqueous solution

Answer 3

ions can move freely

Question 4

what is a positive ion called

Answer 4

cation

Question 5

what is a negative ion called

Answer 5

anion

Question 6

definition of electrolysis

Answer 6

breaking down of a substance using electricity

Question 7

describe what happens in electrolysis

Answer 7

an electric current is passed through an electrolyte ( molten/dissolved ionic compound) , causing it to decompose

Question 8

definition of oxidation

Answer 8

loss of electrons

Question 9

definition of reduction

Answer 9

gain of electrons

Question 10

what pneumonic is used for oxidation and reduction

Answer 10

OIL RIG

Question 11

what is the positive electrode called

Answer 11

anode ( attracts anions - negative ions )

Question 12

what is the negative electrode called

Answer 12

cathode ( attracts cations - positive ions)

Question 13

what do ionic half equations show

Answer 13

show what is happening a each electrode

Question 14

what are the electrodes made from

Answer 14

inert ( unreactive )material = don’t take part in reaction

Question 15

be able to do half equations

Answer 15

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