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Year 8 Revision

  • Game Code: 885997
  •  English    54     Public
    Revision for Term 1 exam
  •   Study   Slideshow
  • What is the type of energy that is associated with an object or particle in motion?
    Kinetic energy
  •  10
  • How does the kinetic energy of particles differ between solids, liquids and gases?
    The kinetic energy of particles is highest in gases and lowest in solids.
  •  15
  • In which state of matter are the particles unable to flow?
    Solid
  •  5
  • What increases when you heat a gas in a deflated balloon? Why?
    The volume of the balloon increases because the particles are moving faster and colliding more forcefully with the sides of the balloon.
  •  20
  • In which state of matter are the attractive forces between particles extremely weak?
    Gas
  •  5
  • Which phase change involves a solid changing directly into a gas?
    Sublimation
  •  10
  • Which change of state involves a gas becoming a liquid?
    Condensation
  •  10
  • Do solids expand or contract when heated? Why?
    They expand because the kinetic energy of the particles is increasing, pushing them farther apart and increasing the space between them.
  •  15
  • What is happening at the part of the heating curve labelled '2'? Why?
    The substance is melting. The temperature is not increasing because the added heat is being used to break attractive forces between particles.
  •  25
  • Do liquids expand or contract when cooled? Why?
    They contract, because the decrease in kinetic energy of particles allows the attractive forces between them to pull them closer together.
  •  15
  • What causes freezing?
    Removing heat decreases the kinetic energy of particles, which allows attractive forces between them to pull them into a rigid structure.
  •  15
  • Which state of matter has a fixed volume but no fixed shape?
    Liquid
  •  5
  • Which change of state involves a liquid transforming into a gas at the liquid surface?
    Evaporation
  •  10
  • What causes a solid to melt?
    Heating the solid increases the kinetic energy of particles until they have enough kinetic energy to overcome some of the attraction between them.
  •  15
  • Identify a difference between evaporation and boiling.
    Evaporation occurs at all temperatures, and only at the liquid surface, whereas boiling occurs only at the boiling point and throughout the whole liquid.
  •  15
  • For which substance is the heating curve shown? How do you know?
    Water, because of its melting point and boiling point
  •  15
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