States of matter

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

  Solid, liquid, and gas
• What does particle theory help explain?

  How particles behave in different states
• How are particles modeled in particle theory?

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

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

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

  Particles are fixed in position
• How do particles in solids behave?

  They 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
• What are the forces of attraction like in liquids?

  Weak forces of attraction
• How are particles arranged in liquids?

  Randomly, but fairly compact
• Why do liquids have a definite volume?

  Particles tend to stick together
• What happens when a liquid is heated?

  Particles 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 become gas
• What is the force of attraction like in gases?

  Very weak
• How do gas particles behave?

  They move freely and fill a container
• What does random motion of gas particles mean?

  Particles can travel in any direction
• What happens when a gas is heated?

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

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

  The pressure will increase
• What happens when a gas is cooled down?

  Particles form bonds and condense