WorksheetsC3.4 Electrolysis of binary compounds
Total questions: 20
Worksheet time: 20mins
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Electrolysis is used to separate an (a) compound.
Define binary.
contains only 0's and 1's.
contains only positive and negative
contains only 2 parts
contains more than 2 parts
Which statements are true? Tick as many boxes as you need.
metals form positive ions
metals form negative ions
non-metals form positive ions
non-metals form negative ions
ionic compounds are made of ____________metal ions and __________non-metal ions.
(a)
What is the 'golden rule' of electrolysis?
metals are positive
non-metals are negative
Hydrogen is a rule breaker
opposites attract
Define ionic.
A compound that contains non-metals only
A compound that contains metals and non-metal atoms
A compound that contains metal and non-metal ions.
A compound that contains metal atoms only
Why must an ionic compound be a liquid to make electrolysis work? (tick all that apply)
The ions need to be ionised
A solid ionic compound can carry an electrical charge.
A liquid ionic compound can carry an electrical charge.
To make it easier for the electricity to travel.
An ionic compound must be (a) to allow the ions to carry an electrical charge.
Why is it less expensive to dissolved a solid ionic compound than to melt it?
It costs less money
Melting solids needs a lot of energy
dissolving solids needs a lot of energy
the more energy we use, the more expensive the process is.
Why is Hydrogen a rule breaker?
It is a non-metal but forms a positive ion (H+)
It is a non-metal but forms a negative ion (H-)
It is a metal but forms a positive ion (H+)
It is a metal but forms a negative ion (H-)
Which of the following statements about water is false?
Water contains H+ ions
Water contains OH- ions
Water cannot be separated using electrolysis
Water can be separated using electrolysis
Consider the ionic compound iron sulphide. Which is the metal ion?
iron sulphide
iron
sulphide
sulphur
Consider the ionic compound lithium oxide. Which is the non-metal?
lithium oxide
lithium
oxide
oxygen
During electrolysis I make chlorine gas at the positive electrode and pure copper at the negative electrode. What is the name of the compound I separated using electrolysis?
copper
chlorine
copper chloride
copper chlorine
Consider the ionic compound copper chloride. Copper is a positive metal which is attracted to the negative electrode. Which statement describes why?
like charges attract
opposites attract
opposites repel
like charges repel
Consider the ionic compound copper chloride. Copper is a positive metal which is attracted to the negative electrode. Where will the chlorine go?
It is attracted to the positive electrode
It is attracted to the negative electrode
You carry out the electrolysis of lead bromide. Tick all the correct observations you would see. Remember 'opposites attract.)
lead at the negative electrode
bromine at the positive electrode
lead at the positive electrode
bromine at the negative electrode.
You carry out the electrolysis of lithium fluoride. Tick all the correct observations and explanations for LITHIUM. Remember 'opposites attract.)
lithium forms a negative ion
lithium forms a positive ion
lithium will be attracted to the positive electrode
lithium will be attracted to the negative electrode
You carry out the electrolysis of magnesium oxide. Tick all the correct observations and explanations for OXYGEN. Remember 'opposites attract.)
oxygen forms a positive ion
oxygen forms a negative ion
oxygen is attracted to the positive electrode
oxygen is attracted to the negative electrode
