Cambridge Primary 5 Science: Changes of State This lesson quiz helps learners identify melting, freezing, evaporation and condensation and explain them using heating and cooling.
Use the model. What is melting?
A
gas changing to liquid
B
solid changing to liquid
C
liquid changing to gas below the surface
D
liquid changing to solid
Explanation
Melting happens when a solid gains enough thermal energy.
What is freezing?
A
solid changing to liquid
B
gas changing to liquid
C
liquid changing to solid
D
solid changing to gas
Explanation
Freezing happens when a liquid cools and becomes solid.
What is evaporation?
A
gas changing to solid
B
solid changing to liquid
C
liquid changing to solid
D
liquid changing to gas at the surface
Explanation
Evaporation can happen below boiling point.
What is condensation?
A
gas changing to liquid
B
liquid changing to solid
C
solid changing to liquid
D
liquid changing to gas
Explanation
Condensation occurs when gas cools.
Which change happens when ice is warmed?
A
condensation
B
melting
C
freezing
D
magnetism
Explanation
Ice changes from solid water to liquid water.
Which change happens when water is cooled below 0 degrees Celsius?
A
melting
B
filtering
C
freezing
D
evaporation
Explanation
Liquid water becomes ice.
Which change forms droplets on the outside of a cold glass?
A
melting
B
dissolving
C
evaporation
D
condensation
Explanation
Water vapour in air cools and becomes liquid droplets.
Why does a puddle slowly disappear on a warm day?
A
water evaporates
B
water becomes a solid shadow
C
water freezes
D
water turns into soil
Explanation
Liquid water changes to water vapour.
Which process requires cooling?
A
evaporation usually
B
condensation
C
melting
D
boiling
Explanation
Cooling water vapour can form liquid water.
Which process requires heating?
A
condensation
B
cooling a drink
C
melting
D
freezing
Explanation
Heating can make a solid melt.
What is boiling?
A
gas changing to liquid
B
solid separating by sieving
C
slow solidification
D
rapid change from liquid to gas throughout the liquid
Explanation
Boiling occurs throughout the liquid at its boiling point.
How is boiling different from evaporation?
A
Boiling happens throughout the liquid; evaporation happens at the surface
B
Evaporation needs no particles
C
They are not changes of state
D
Boiling makes a solid
Explanation
This is the key difference.
Which change is reversible for water?
A
rusting iron
B
ice melting and refreezing
C
burning paper
D
cooking an egg
Explanation
Water can change state and change back.
What stays the same when pure water freezes?
A
it becomes air
B
it has no mass
C
the substance is still water
D
it becomes a new metal
Explanation
Only the state changes.
Which particle change happens during melting?
A
particles stop vibrating completely
B
particles become atoms of gold
C
particles disappear
D
particles gain energy and move past each other
Explanation
The solid structure breaks down.
Which particle change happens during freezing?
A
particles lose energy and become fixed in position
B
particles spread far apart
C
particles disappear
D
particles become pollen
Explanation
Liquid particles arrange as a solid.
Why does wet clothing dry faster in wind?
A
Wind stops evaporation
B
Moving air removes water vapour near the cloth
C
Wind makes water heavier
D
Wind freezes all water
Explanation
This increases the rate of evaporation.
Why does wet clothing dry faster when warm?
A
Warmth makes water solid
B
Warmth adds more water
C
Particles have more energy to evaporate
D
Warmth stops gas movement
Explanation
Higher temperature speeds evaporation.
Which instrument measures temperature during changes of state?
A
sound meter only
B
magnet
C
ruler
D
thermometer
Explanation
Temperature can be monitored with a thermometer.
Which summary is correct?
A
Heating and cooling can cause reversible changes of state
B
State changes always make new substances
C
Condensation makes a solid from liquid
D
Freezing needs heating
Explanation
Changes of state usually do not form new substances.