PARTICLE MODEL OF MATTER

• Solid particles are in a fixed position
• What type of movement do solid particles exhibit?

  Vibration around a fixed position
• How do liquid particles move compared to solid particles?

  Randomly within confinement
• Unlike gases, liquid particles have limited movement
• Liquid particles are in a fixed position like solid particles.

  False
• What happens to a substance when energy is added to it in terms of phase changes?

  Melting or evaporation
• Order the phase changes when energy is removed from a system

  1️⃣ Condensation

  2️⃣ Freezing
• Define density in terms of mass and volume.

  Mass per unit volume
• The equation for density is Rho = mass/volume
• The symbol for density is Rho.


  True
• Match the quantity with its unit:

  Mass ↔️ Kilograms

  Volume ↔️ Meters cubed

  Density ↔️ Kilograms per meters cubed
• What is specific heat capacity?

  Energy needed to raise temperature
• The equation for specific heat capacity is change in energy = mass * specific heat capacity * change in temperature
• Specific heat capacity is unique to each substance.


  True
• What are the units for specific heat capacity?

  Joules per kilogram degree C
• Specific latent heat is the energy needed to change a substance's phase
• What is the equation for specific latent heat?

  Energy = mass * specific latent heat
• When a substance is pure, it changes phase at a single temperature.


  True
• At low temperatures, most molecules in a system have less energy.
• Match the concept with its definition:

  Density ↔️ Mass per unit volume

  Specific heat capacity ↔️ Energy to raise temperature

  Specific latent heat ↔️ Energy to change phase
• What happens to the number of molecules with high energy as temperature increases?

  It increases
• Order the changes in kinetic energy of molecules as temperature increases

  1️⃣ Low average kinetic energy

  2️⃣ More molecules with high energy

  3️⃣ Evaporation begins

  4️⃣ Lowered average kinetic energy
• Evaporation lowers the average kinetic energy of a system.


  True
• What happens to pressure in a closed container when more gas is added?

  It increases
• Pressure is the force exerted on the walls of a container by gas molecules
• Match the quantity with its symbol:

  Density ↔️ Rho

  Pressure ↔️ P

  Specific latent heat ↔️ L
• What are the units for pressure?

  Pascals
• The average kinetic energy of molecules is represented by the area under the energy distribution graph.


  True