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9C States of Matter

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  • The temperature at which a substance changes from solid to liquid is known as its ____________.
    melting point
  • Which part of the graph shows a change of state?
    a
  • If you increase pressure and keep temperature constant, volume will ________.
    decrease
  • Which part of the graph shows melting?
    c
  • On a heating curve, what does a plateau indicate?
    The substance is not changing state.
    A temperature increase.
    A constant temperature during a state change.
    The substance is no longer being heated.
  • Which theory is this?
    Kinetic particle theory
  • If you increase temperature and keep volume constant, pressure will ______.
    increase
  • What happens to the particles of a substance when it is heated and reaches its boiling point?
    They move further apart and move more quickly.
    They change colour.
    They stop moving.
    They move closer together.
  • Describe the forces of attraction between solid particles.
    Particles are held together by very strong attractive forces.
  • How does energy transfer during the cooling of a substance?
    Energy remains constant in the substance.
    Energy is absorbed from the surroundings.
    Energy is released into the surroundings.
  • The process of changing from a gas to liquid - the particles lose kinetic energy and come closer together. They eventually clump together in an irregular pattern.
    Condensation
  • Which part of the graph shows boiling?
    b
  • This state of matter has particles that are close together and touch each other in an irregular pattern. They can move around and slide past one another.
    Liquid
  • Describe the physical properties of gases(shape, volume, compressibility),
    No fixed shape, no fixed volume, compressible.
  • The point on a cooling curve where a liquid starts to solidify is called the _______ point.
    freezing
  • This state of matter has particles that are close together and touching each other in a regular, repeating pattern. They vibrate about fixed positions but do not move apart.
    Solid
  • Which state changes are shown in this heating curve?
    melting and boiling
    melting only
    boiling only
    freezing and condensing
  • If you decrease volume and keep temperature constant, pressure will ________.
    increase
  • Why does a substance's temperature not change during a phase transition, despite continued heating?
    Because the heating process stops temporarily.
    Because the temperature measurement is incorrect.
    Because the substance is losing energy.
    Because the energy is used to overcome forces of attraction.
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