States of matter

• What is matter?


  Matter is anything that has mass and occupies space.
• What are the three states of matter?

  Matter exists as solid, liquid, and gas.
• Can some substances exist in more than one state?

  Yes, some substances can exist in more than one state.
• Name a substance that can exist in all 3 states of matter.

  Water can exist in three states: solid, liquid, and gas.
• What are the states of water at different temperatures?

  • Solid (ice) below 0°C
  • Liquid (water) between 0°C and 100°C
  • Gas (steam/water vapor) above 100°C
• Name a substance that can exist in ONLY 2 states of matter.

  Iodine can exist in two states: solid and gaseous iodine.
• What are the two states of iodine?

  • Grey-black solid iodine
  • Purple gaseous iodine
• What is another substance that can exist in ONLY 2 states of matter?

  Dry ice can exist as solid CO2 and gaseous CO2.
• What is the Particulate Theory of Matter?

  The particulate theory states that all matter is made up of particles that are in constant and random motion.
• What are the key points of the Particulate Theory of Matter?

  • All matter is made up of particles (atoms, molecules, ions).
  • Particles are in constant and random motion.
  • Particles vibrate in solids and move in liquids and gases.
  • Temperature affects the speed of motion.
  • There are forces of attraction and repulsion between particles.
• What is a physical change in terms of state?

  A physical change is changing the state of a substance without changing its chemical composition.
• How does matter change from one state to another?

  Matter changes from one state to another by either absorbing or releasing heat energy.
• What are the different changes in state of matter?

  • Freezing
  • Boiling
  • Evaporation
  • Melting
  • Sublimation
  • Condensation
• What is evaporation?

  Evaporation is the change in state from a liquid to a gas without boiling.