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Evaporation and Condensation

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