changes of state and particle model

• what is a solid?

  the state of matter where the particles are linked by strong forces. they are packed closely together and move very little (vibrate)
• what is a gas?

  the state of matter where particles are far apart and are in constant random motion they do not interact with each other
• what is the change of state from a gas to solid?

  Deposition
• why does temperature not increase during melting?

  energy is being used to weaken forces between particles
• what is evaporation?


  Process of liquid turning into vapor below the boiling point of the liquid, this is a gradual process where the most particles leave
• what type of change creates new products and cannot be reserved?

  chemical
• what two things happen when you heat a substance?

  the temperature may increase or the state might change
• what is a liquid?

  the star of matter where the particles have weaker bonds, they are still tightly packed but can move around
• What is density?

  the mass per unit volume of a material
• why does energy not increase during boiling?

  energy is being used to weaken forces between particles
• solid to gas?


  Sublimation
• why might the temp of a substance increase as it is heated?

  particles gain more kinetic energy and temperature is a measure of kinetic energy
• what happens to the motion of particles in a gas when temperature is increased?

  they move faster as they have more kinetic energy
• gas to liquid?


  Condensation
• latent heat of vaporisation is for?

  liquid to gas (vapour)
• what happens to an object if you increase the kinetic energy of the particles?

  Temperature increases
• what is the equation for density?

  Density = mass/volume
• explain density in each matter

  • solids have the highest density
  • gases have the lowest density
  • liquids have density which is in-between the two