States of Matter

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

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

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

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

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

  A regular lattice structure
• Why do solids have a definite shape and volume?

  Particles are fixed in position
• What movement can particles in a solid do?

  Vibrate in their position
• What happens to solid particles when heated?

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

  The temperature where solids melt
• What occurs at the melting point?

  Particles break free of their bonds
• How are particles arranged in liquids?

  Randomly, but fairly compact
• What allows liquids to flow and change shape?

  Weak forces of attraction
• What happens to liquid particles when heated?

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

  The temperature where liquids boil
• What happens at the boiling point?

  Particles break bonds and evaporate
• How are gas particles described in terms of attraction?

  Very weak forces of attraction
• What shape and volume do gases have?

  They fill a container and have no definite shape
• How do gas particles move?

  In straight lines with random motion
• What does random motion of gas particles mean?

  Particles can travel in any direction
• What happens to gas particles when heated?

  They gain energy and travel faster
• What occurs if a gas is in an expandable container when heated?

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

  The pressure will increase
• What happens to gas particles when cooled sufficiently?

  They form bonds and condense into a liquid
• What happens to liquid particles when cooled further?

  They form more bonds and freeze into a solid
• What is a limitation of the particle model?

  It doesn't accurately represent particle shapes
• What does the particle model fail to include?

  Details of forces between particles
• Why are models like the particle theory useful?

  They simplify complex concepts
• What are the processes of changing states of matter?

  • Melting: Solid to liquid at melting point
  • Boiling: Liquid to gas at boiling point
  • Condensing: Gas to liquid when cooled
  • Freezing: Liquid to solid when cooled further