Particle theory & States of matter

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

  Solid, liquid, and gas
• What model is used to explain how particles behave in different states of matter?

  Particle theory or kinetic theory
• How are particles in solids described in the particle theory?

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

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

  A regular lattice structure
• Why does a solid maintain a definite shape and volume?

  Because the particles are fixed in position
• How do particles in a solid behave?

  They vibrate around in fixed positions
• What happens to solid particles when heated?

  They gain energy and vibrate more
• What is the temperature called at which a solid melts?

  Melting point
• 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 a liquid?

  Randomly
• Why do liquids have a definite volume?

  Because the particles tend to stick together
• What happens when a liquid is heated?

  Particles gain energy and move faster
• What is the temperature called at which a liquid boils?

  Boiling point
• What occurs at the boiling point?

  Particles break the bonds altogether
• What are the forces of attraction like in gases?

  Very weak forces of attraction
• How do gas particles behave?

  They are free to move around by themselves
• Why do gases not keep a definite shape or volume?

  Because they fill a container as much as possible
• What does random motion of gas particles mean?

  Particles can travel in any direction and are deflected randomly
• What happens when a gas is heated?

  Particles gain energy and travel faster
• What occurs when the gas container is expandable?

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

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

  Particles won't have enough energy to overcome forces of attraction
• What occurs when gas particles condense?

  They form bonds and turn into a liquid
• What happens when a liquid is cooled down further?

  Particles won't have enough energy to overcome attraction and form bonds
• What occurs when liquid particles freeze?

  They form bonds and become a solid
• What happens to mass in a closed system during changes in state?

  The mass remains unchanged
• How does density change among the three states of matter?

  Solids have the highest density, liquids have lower density, and gases have the lowest density
• What is the relationship between the number of particles and mass in a closed system?

  The number of particles remains the same
• What is the overall conclusion of the video regarding changes in state?

  Changes in state do not change the mass in a closed system
• What should viewers do if they enjoyed the video?

  Give a like and subscribe
• What is the purpose of the video?

  To explain the three states of matter and how substances change states