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Evaporation and Condensation
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Which change is a physical change?
 
Evaporation of water
 
Burning of paper
 
Rusting of iron
Why does fog form in the early morning?
 
Water vapour cools and condenses
 
Water freezes in the air
 
Water evaporates quickly
During condensation, particles
 
Lose energy and move closer
 
Gain energy and spread apart
 
Stay the same
Which of the following involves loss of heat?
 
Condensation
 
Evaporation
 
Boiling
Why does sweating cool the body?
 
Sweat evaporates and absorbs heat
 
Sweat condenses and releases heat
 
Sweat freezes on skin
Which process changes water vapour into tiny water droplets?
 
Condensation
 
Evaporation
 
Melting
When steam touches a cold mirror
 
what happens?
 
Condensation occurs
 
Evaporation occurs
 
Freezing occurs
Which factor slows down evaporation?
 
High humidity
 
Strong wind
 
High temperature
What forms when water vapour cools high in the sky?
 
Clouds
 
Rocks
 
Smoke
Which statement about evaporation is correct?
 
It can happen at any temperature
 
It only happens at boiling point
 
It only happens in sunlight
What happens to energy during evaporation?
 
Heat is absorbed
 
Heat is released
 
No energy change
Why do droplets form outside a cold can?
 
Water vapour condenses
 
Liquid evaporates
 
Solid melts
Which surface allows faster evaporation?
 
Wide shallow dish
 
Narrow tall bottle
 
Closed container
What is needed for condensation to occur?
 
Cooling of gas
 
Heating of liquid
 
Adding salt
During evaporation, particles are
 
Moving farther apart
 
Moving closer together
 
Not moving
Which of the following is condensation in nature?
 
Cloud formation
 
Ice melting
 
River flowing
Which weather condition increases evaporation?
 
Hot and dry weather
 
Cold and wet weather
 
Freezing temperature
What happens to air when water vapour condenses?
 
It becomes warmer
 
It becomes colder
 
It disappears
Why does evaporation cause cooling?
 
High energy particles escape
 
Low energy particles escape
 
No particles escape
What state of matter is water vapour?
 
Gas
 
Liquid
 
Solid
Which factor does NOT affect evaporation?
 
Colour of the container
 
Temperature
 
Wind speed
Why does a puddle disappear after rain?
 
Water evaporates into the air
 
Water turns into ice
 
Water sinks into the sky
Which of the following is an example of condensation?
 
Water droplets forming on a cold glass
 
Ice melting into water
 
Water boiling into steam
What happens to temperature during condensation?
 
Heat is released
 
Heat is absorbed
 
No heat change
Which condition will cause clothes to dry faster?
 
Windy day
 
Humid day
 
Cold and still air
Where does evaporation take place in a liquid?
 
At the surface
 
At the bottom only
 
In the middle only
What happens to water molecules during evaporation?
 
They gain energy and move faster
 
They lose energy and slow down
 
They stop moving
Which factor increases the rate of evaporation?
 
Higher temperature
 
Lower temperature
 
No heat
Condensation describes a change of state in matter. Which change is it?
 
Gas changing into liquid
 
Liquid changing into gas
 
Solid changing into gas
Evaporation describes a change of state in matter. Which change is it?
 
Liquid changing into gas
 
Gas changing into liquid
 
Solid changing into liquid
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