C1.1.1 States of Matter

• What does the particle model represent matter as being made of?

  Tiny particles in motion
• Particles in a solid are tightly packed and vibrate in fixed positions.


  True
• The particle model describes matter as tiny particles in constant motion
• In a gas, particles are widely spaced and move randomly in all directions
• The particle model states that matter is made of tiny particles in constant motion
• In a gas, particles are widely spaced and move randomly in all directions
• The kinetic theory of gases assumes that forces between gas particles are significant.

  False
• Particles in a solid have a definite shape and volume because they are tightly packed in fixed positions.

  True
• Particles in a liquid vibrate in fixed positions.

  False
• Higher temperature in a gas means particles move slower on average.

  False
• Match the state of matter with its correct properties:

  Solid ↔️ Definite volume and shape

  Liquid ↔️ Definite volume, changes shape

  Gas ↔️ Changes volume and shape
• Gases change both their volume and shape
• Higher temperature increases the average kinetic energy of gas particles.


  True
• Particles in a solid are mobile and can move past each other.

  False
• Match the assumption of the kinetic theory of gases with its description:

  Random Motion ↔️ Gas particles move randomly in all directions

  Negligible Volume ↔️ The volume of gas particles is small compared to the overall gas volume

  No Intermolecular Forces ↔️ The forces between gas particles are negligible

  Elastic Collisions ↔️ Kinetic energy is conserved when gas particles collide
• According to the kinetic theory, the temperature of a gas is proportional to the average kinetic energy
• Liquids have particles that are closer together compared to gases but can move past each other
• The kinetic theory of gases uses the particle model to explain gas behavior by focusing on the movement and collisions
• In a solid, particles are tightly packed in fixed positions and vibrate