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Chapter 7

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  • What is the reverse of melting?
    Evaporation
    Boiling
    Solidification
    Condensation
  • Which state has a fixed shape and volume?
    Gas
    Liquid
    Solid
    Plasma
  • Which diagram shows particles in a fixed regular arrangement?
    Solid
  • What happens to particles when a substance is heated?
    They move faster and spread apart
  • Why do hot fluids rise?
    They become less dense due to expansion
  • What causes a substance to contract?
    Cooling
  • What happens to a solid’s particles when it is heated?
    They vibrate faster and move slightly apart
  • What is matter made of?
    Small particles
  • Which state of matter is easily compressed?
    Plasma
    Liquid
    Gas
    Solid
  • Which state has no definite shape or volume?
    Gas
    Liquid
    Solid
    Plasma
  • What is expansion?
    Increase in particle spacing due to heating
  • What does the particle model help us understand?
    The behavior of solids liquids and gases
  • Why might mixing two liquids result in a smaller volume?
    Particles fit into gaps between each other
  • What phase change turns a liquid into a gas?
    Evaporation
    Melting
    Condensation
    Solidification
  • Which state has a fixed volume but takes the shape of its container?
    Solid
    Plasma
    Gas
    Liquid
  • What happens to particles during melting?
    They gain energy and move more freely
  • What does the particle model not explain?
    Volume
    Changes of state
    Shape
    Color
  • What happens to particle movement during cooling?
    They slow down
  • Boiling is a change from what to what?
    Liquid to gas
  • How do particles move in a solid?
    Vibrate in fixed positions
  • What does a diagram of a boiling substance show?
    Both liquid and gas particles
  • How can you tell a diagram shows a gas?
    Particles are far apart and move freely
  • Which state of matter has particles far apart and moving quickly?
    Liquid
    Gas
    Plasma
    Solid
  • What is needed for a substance to change state?
    Energy
  • What happens to particles in a gas?
    They move freely and randomly
  • What is condensation?
    Change from gas to liquid
  • What increases during expansion?
    Particle spacing
  • How many states exist at the melting point?
    Two
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