States of Matter

• What are the three states of matter discussed in the video?

  Solid, liquid, and gas
• What model is used to explain how particles behave in different states of matter?

  Particle theory
• How are particles in solids described in the particle theory model?

  As small solid inelastic spheres
• What holds the particles in a solid close together?

  Strong forces of attraction
• What structure do particles in a solid form?

  A regular lattice structure
• Why does a solid maintain a definite shape and volume?

  Because the particles are fixed in position
• How do particles in a solid behave?

  They vibrate in their fixed positions
• What happens to the particles of a solid when it is heated?

  They gain more energy and vibrate more
• What is the melting point?


  The temperature at which a solid melts into a liquid
• What occurs at the melting point?

  The particles have enough energy to break free of their bonds
• How are particles arranged in a liquid?

  They are arranged randomly but are fairly compact
• What allows liquids to flow and change shape?


  The weak forces of attraction between the particles
• What happens to the particles of a liquid when it is heated?

  They gain more energy and move around faster
• What is the boiling point?

  The temperature at which a liquid boils or evaporates into a gas
• What occurs at the boiling point?

  The particles have enough energy to break the bonds altogether
• How do gases behave in terms of shape and volume?


  Gases do not keep a definite shape or volume
• What is meant by random motion of gas particles?

  Particles can travel in any direction and are deflected randomly
• What happens to gas particles when they are heated?

  They gain more energy and travel faster
• What happens to a gas in an expandable container when heated?

  The gas will expand
• What happens to a gas in a fixed container when heated?

  The pressure will increase
• What happens to gas particles when they are cooled down enough?

  They won't have enough energy to overcome the forces of attraction