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4 Chemical Changes - Electrolysis

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Total cards: 21•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (21)

#1
Front (Question)

What is electrolysis?

Back (Answer)

Using electricity to break down a substance

#2
Front (Question)

What happens to an ionic substance when it is melted or dissolved in water?

Back (Answer)

The ions become free to move around

#3
Front (Question)

What is the name for the positive electrode?

Back (Answer)

The anode

#4
Front (Question)

What is the name for the negative anode?

Back (Answer)

The cathode

#5
Front (Question)

Do positive ions move to the anode or the cathode?

Back (Answer)

Cathode

#6
Front (Question)

Do negative ions move to the anode or the cathode?

Back (Answer)

Anode

#7
Front (Question)

At which electrode would Zn2+(aq) turn into Zn(s)?

Back (Answer)

Cathode (needs to gain electrons)

#8
Front (Question)

At which electrode would Cl-(aq) turn into Cl2(g)?

Back (Answer)

Anode (needs to lose electrons)

#9
Front (Question)

Balance the equation: Al3+ + e- gives Al

Back (Answer)

Al3+ + 3e- gives Al

#10
Front (Question)

Balance the equation: Cl- gives Cl2 + e-

Back (Answer)

2Cl- gives Cl2 + 2e-

#11
Front (Question)

Balance the equation: O2- gives O2 + e-

Back (Answer)

2O2- gives O2 + 4e-

#12
Front (Question)

What will be the products for the electrolysis of molten iron bromide?

Back (Answer)

Iron and bromine

#13
Front (Question)

What will be the products for the electrolysis of molten zinc oxide?

Back (Answer)

Zinc and oxygen

#14
Front (Question)

For the extraction of which metals is electrolysis needed?

Back (Answer)

Ones more reactive than carbon, e.g. aluminium

#15
Front (Question)

What are the two main disadvantages of using electrolysis to extract metals?

Back (Answer)

Requires a large amount of energy to melt the compounds and to produce the necessary electricity

#16
Front (Question)

Why is aluminium oxide mixed with cryolite when extracting aluminium?

Back (Answer)

To lower the melting point

#17
Front (Question)

What is produced at the anode and cathode in the electrolysis of aluminium oxide?

Back (Answer)

Aluminium at the cathode and oxygen at the anode

#18
Front (Question)

Why does the anode need to be replaced in the electrolysis of aluminium oxide?

Back (Answer)

The oxygen reacts with the carbon electrode to produce carbon dioxide.

#19
Front (Question)

In the electrolysis of sodium chloride solution, what are the products?

Back (Answer)

Chlorine gas and hydrogen gas

#20
Front (Question)

Why is sodium not produced in the electrolysis of sodium chloride solution?

Back (Answer)

It is more reactive than hydrogen so hydrogen is produced instead.

#21
Front (Question)

What is produced at the anode in electrolysis of solutions?

Back (Answer)

Either a halogen or oxygen (when there is no halogen present)