States of matter

• Which theory attempts to explain the three states of matter?

  Kinetic / particle theory
• What are the 3 main assumptions in the particle theory?

  Particles are small , sphere and inelastic.
• In solids, strong attractive forces hold the particles in place, so that they can only vibrate in position.
• What happens when you add heat to a solid?

  The particles gain energy and vibrate faster and faster. They eventually have so much energy that they can overcome the forces holding them togeather and melt into a liquid.
• When a solid is heated energy transfers to the particles kinetic energy store, causing them to vibrate faster.
• What happens if you add heat to a gas?

  The particles gain kinetic energy and move faster. With enough energy they can break the forces of attraction between the molecules. At this point the liquid would boil into a gas.
• What happens when a gas is heated?

  Particles gain kinetic energy and move faster and faster.
• Gas is trapped within a container and can't expand, it means that the volume of the gas is fixed, and so the pressure inside the container increases. 
• Gases have weak forces of attraction
• In a closed system, why wont changes in state change the mass?

  The amount of particles is still the same.