electrolysis exam questions AND
ANSWERS
1. A solution of aqueous copper chloride is electrolysed. This produces chlorine gas and
solid copper. State the electrode at which you might expect to locate strong copper. (1) -
ANSWER--The cathode.
2. Aluminium is extracted from aluminium oxide by means of electrolysis.
In the electrolysis mobile, there's a mixture of aluminium oxide and molten cryolite.
Explain why. (three) - ANSWER-The mixture of aluminium oxide and molten cryolite
melts at a decrease temperature than aluminium oxide on my own. [1]
This reduces the amount of energy required with the aid of the manner. [1]
This therefore reduces expenses. [1]
3. Chlorine is produced at the superb electrode. Describe and give the end result of a
chemical take a look at to prove that the fuel is chlorine. (2) - ANSWER--litmus paper /
Universal Indicator paper / pH pape
-bleached / turns white or loses its coloration
4. Copper nitrate answer is blue. Suggest why the blue coloration of the copper nitrate
answer fades at some point of the electrolysis. (2) - ANSWER--copper ions are
discharged (from the solution)
5. Describe and give an explanation for how electrolysis is used to make natural copper
from a lump of impure copper. (four) - ANSWER--impure copper is anode /
high-quality (electrode)
-natural copper is cathode / poor (electrode)
6. Electrolysis and chemical cells both involve chemical reactions and energy. Explain the
difference between the tactics in electrolysis and in a chemical cell. (2) -
ANSWER--electrolysis makes use of strength to produce a chemical reaction
-(however) cells use a chemical response to supply power
7. Explain how carbon dioxide forms at the high quality electrodes in the course of
electrolysis (3) - ANSWER--(due to the fact) the anodes or (tremendous) electrodes
are manufactured from carbon / graphite
-oxygen is produced (at anode)
-which reacts with the electrodes / anodes
8. Explain how magnesium is produced at the bad electrode (2) - ANSWER--magnesium
(ions) attracted (to the electrode)
- so magnesium ions benefit electrons
-2 electrons
9. Explain why a aggregate is used because the electrolyte as opposed to the use of
handiest aluminium oxide. (2) - ANSWER--combination has a lower melting point
(than aluminium oxide)
-(so) much less energy wanted
ANSWERS
1. A solution of aqueous copper chloride is electrolysed. This produces chlorine gas and
solid copper. State the electrode at which you might expect to locate strong copper. (1) -
ANSWER--The cathode.
2. Aluminium is extracted from aluminium oxide by means of electrolysis.
In the electrolysis mobile, there's a mixture of aluminium oxide and molten cryolite.
Explain why. (three) - ANSWER-The mixture of aluminium oxide and molten cryolite
melts at a decrease temperature than aluminium oxide on my own. [1]
This reduces the amount of energy required with the aid of the manner. [1]
This therefore reduces expenses. [1]
3. Chlorine is produced at the superb electrode. Describe and give the end result of a
chemical take a look at to prove that the fuel is chlorine. (2) - ANSWER--litmus paper /
Universal Indicator paper / pH pape
-bleached / turns white or loses its coloration
4. Copper nitrate answer is blue. Suggest why the blue coloration of the copper nitrate
answer fades at some point of the electrolysis. (2) - ANSWER--copper ions are
discharged (from the solution)
5. Describe and give an explanation for how electrolysis is used to make natural copper
from a lump of impure copper. (four) - ANSWER--impure copper is anode /
high-quality (electrode)
-natural copper is cathode / poor (electrode)
6. Electrolysis and chemical cells both involve chemical reactions and energy. Explain the
difference between the tactics in electrolysis and in a chemical cell. (2) -
ANSWER--electrolysis makes use of strength to produce a chemical reaction
-(however) cells use a chemical response to supply power
7. Explain how carbon dioxide forms at the high quality electrodes in the course of
electrolysis (3) - ANSWER--(due to the fact) the anodes or (tremendous) electrodes
are manufactured from carbon / graphite
-oxygen is produced (at anode)
-which reacts with the electrodes / anodes
8. Explain how magnesium is produced at the bad electrode (2) - ANSWER--magnesium
(ions) attracted (to the electrode)
- so magnesium ions benefit electrons
-2 electrons
9. Explain why a aggregate is used because the electrolyte as opposed to the use of
handiest aluminium oxide. (2) - ANSWER--combination has a lower melting point
(than aluminium oxide)
-(so) much less energy wanted
