States of matter

• What are the 3 states of matter?


  Solid, liquid, gas.
• What determines which state something is at?

  How strong the forces of attraction between particles are.
• What 3 things contribute to how strong the forces of attraction are?


  Material, temperature, pressure.
• What are forces of attraction like in solids?


  Strong.
• Why do solids expand a little when heated?


  More vibrations between particles.
• Why do solids keep a definite shape and volume?


  They don’t move from their positions.
• What are forces of attraction between particles like in a liquid?


  Weak, but tend to stick closely together.
• Liquids have a definite volume but don’t keep a definite shape.
• What are liquid particles doing?


  Moving constantly.
• What are forces of attraction between molecules like in gases?


  Very weak.
• What happens to gas particles when heated?


  Expand or pressure increases.
• Gases don’t keep a definite shape or volume and will always fill any container.
• What is a problem with the particle theory model?


  Doesn’t show forces between particles.