AQA GCSE Chemistry – Electrolysis
Exam with Complete Solutions
The breaking down of a substance using electricity - ANSWER-What is electrolysis?
Of aqueous ionic compounds
Of molten ionic compounds - ANSWER-Types of electrolysis
a compound composed of positive(cations) and negative ions(anions) - ANSWER-Ionic
compound
The electrons aren't free to move and carry the charge through the structure -
ANSWER-Why can't ionic compounds conduct electricity as solid?
a liquid/solution that conducts electricity - ANSWER-What is an electrolyte?
Gain/loss of electrons to become electrically neutral/ an atom - ANSWER-Define
discharge
The ion that is easiest to discharge will be discharged - ANSWER-What is the general
rule for electrolysis of aqueous solutions regarding which ion gets discharged at each
electrode ?
by melting or dissolving ionic compounds - ANSWER-How are electrolytes made?
Anode - ANSWER-What is the a positive electrode called?
Cathode - ANSWER-What is a negative electrode called?
gain of electrons - ANSWER-reduction
loss of electrons - ANSWER-Oxidation
Cathode - ANSWER-Which electrode are cations discharged at ?
reduction
Cations are discharged at the cathode as they gain electrons to become atoms -
ANSWER-Does oxidation or reduction occur at the cathode?
Potassium
sodium
, Lithium
calcium
magnesium
aluminium
CARBON
zinc
iron
Tin
lead
HYDROGEN
copper
silver
gold
Platinum - ANSWER-Reactivity series
For comparison to determine how metals could be extracted - ANSWER-Why are
hydrogen and carbon included in the reactivity series?
Gold
It is so unreactive that it is found as a native metal and not a compound - ANSWER-
Which elements are found as native metals?
By reduction with carbon - ANSWER-How are metals that are less reactive than carbon
extracted ?
Electrolysis - ANSWER-How are metals that are more reactive than carbon extracted ?
Electrolysis - ANSWER-How are metals that would react with carbon during carbon
reduction extracted?
Rock that contains enough of a metal or metal compound to make it worth extracting for
a profit - ANSWER-Ore
Expensive - ANSWER-Cost of metals produced by electrolysis
High cost of heat energy to melt metal compounds
High cost of electricity for process - ANSWER-Why are metals produced by electrolysis
expensive ?
Anode - ANSWER-Which electrode are anions discharged at?
oxidation
Anions are discharged at the anode as they lose electrons to become atoms -
ANSWER-Does oxidation or reduction occur at the anode?
By losing or gaining electrons - ANSWER-How do ions become atoms or molecules?
Exam with Complete Solutions
The breaking down of a substance using electricity - ANSWER-What is electrolysis?
Of aqueous ionic compounds
Of molten ionic compounds - ANSWER-Types of electrolysis
a compound composed of positive(cations) and negative ions(anions) - ANSWER-Ionic
compound
The electrons aren't free to move and carry the charge through the structure -
ANSWER-Why can't ionic compounds conduct electricity as solid?
a liquid/solution that conducts electricity - ANSWER-What is an electrolyte?
Gain/loss of electrons to become electrically neutral/ an atom - ANSWER-Define
discharge
The ion that is easiest to discharge will be discharged - ANSWER-What is the general
rule for electrolysis of aqueous solutions regarding which ion gets discharged at each
electrode ?
by melting or dissolving ionic compounds - ANSWER-How are electrolytes made?
Anode - ANSWER-What is the a positive electrode called?
Cathode - ANSWER-What is a negative electrode called?
gain of electrons - ANSWER-reduction
loss of electrons - ANSWER-Oxidation
Cathode - ANSWER-Which electrode are cations discharged at ?
reduction
Cations are discharged at the cathode as they gain electrons to become atoms -
ANSWER-Does oxidation or reduction occur at the cathode?
Potassium
sodium
, Lithium
calcium
magnesium
aluminium
CARBON
zinc
iron
Tin
lead
HYDROGEN
copper
silver
gold
Platinum - ANSWER-Reactivity series
For comparison to determine how metals could be extracted - ANSWER-Why are
hydrogen and carbon included in the reactivity series?
Gold
It is so unreactive that it is found as a native metal and not a compound - ANSWER-
Which elements are found as native metals?
By reduction with carbon - ANSWER-How are metals that are less reactive than carbon
extracted ?
Electrolysis - ANSWER-How are metals that are more reactive than carbon extracted ?
Electrolysis - ANSWER-How are metals that would react with carbon during carbon
reduction extracted?
Rock that contains enough of a metal or metal compound to make it worth extracting for
a profit - ANSWER-Ore
Expensive - ANSWER-Cost of metals produced by electrolysis
High cost of heat energy to melt metal compounds
High cost of electricity for process - ANSWER-Why are metals produced by electrolysis
expensive ?
Anode - ANSWER-Which electrode are anions discharged at?
oxidation
Anions are discharged at the anode as they lose electrons to become atoms -
ANSWER-Does oxidation or reduction occur at the anode?
By losing or gaining electrons - ANSWER-How do ions become atoms or molecules?
