States of Matter

Liquid
1. Closely compact - still move
2. Particles slide over one another
3. Forces of attraction are less effective than solid
4. Fixed volume, takes shape of container.
5. Have more kinetic energy than solid
Solid
1. Strong forces of attraction
2. Cannot be compressed
3. Regularly arranged
4. Fixed volume and shape
5. Particles are closely compact
6. Particles don't move they vibrate around a fixed point
  1. Have least kinetic energy
Gas
1. Have most kinetic energy
2. No fixed shape or volume
3. No arrangement
4. Move randomly
5. Almost no forces of attraction
Interconversions
1. Solid and Liquid
  1. Solid to Liquid = Melting
    1. Heat a solid, energy provided makes particles vibrate faster eventually vibrate so fast that the forces of attraction become weak and are no longer strong enough to hold particles together. Solid melts. As liquid particles have more kinetic energy so solid particles has to be supplied with kinetic energy to convert to a liquid. Melting Point - temperature at which solid melts.
  2. Liquid to Solid = Freezing
    1. Liquid cooled, particles move slowly, force of attraction will hold the particles together. Freezing Point: Temperature at which liquid freezes
2. Liquid and Gas
  1. Liquid to Gas = boiling / evaporation
    1. Boiling
      1. Occurs when a liquid is heated so strongly so that particles are moving fast enough to overcome all the forces of attraction between them.
        the stronger the forces of attraction, the higher the boiling point because more energy is needed to overcome these forces of attraction.
      2. If gas is cooled, the particles eventually move slowly enough that the forces of attraction between them start to form and hold them together as a liquid. The gas condenses
    2. Evaporation
      1. In any liquid or gas, the average speed of the particles varies with temperature. But at each temperature, some particles will be moving faster than the average.
        Some very fast particles at the surface of the liquid have enough kinetic energy to overcome forces of attraction - they will break away to form a gas.
        If a liquid is in a closed container, particles in the gas will be colliding with the particles at the surface of liquid. If they are moving slowly enough then they will be held by forces of attraction and become part of liquid.
        In a closed container evaporation and condensation will occur at same time.
  2. Gas to Liquid = Condensation
  3. Difference between Boiling and Evaporation
    1. Evaporation occurs at any temperature, but boiling occurs at one temperature - the boiling point of liquid.
3. Gas and Solid
  1. Gas to Solid = Deposition
  2. Solid to gas = Sublimation
  3. Very few substances can change directly from a solid to gas or gas to solid, at normal pressure.
    1. Example : Carbon dioxide. At ordinary pressure there is no such thing as liquid carbon dioxide - it directly turns from solid to a gas.
Working out physical state of a substance at a particular temperature
1. A substance below its melting point = SOLID
2. Between melting point and boiling point = LIQUID
3. Above its boiling point = GAS
Diffusion
1. Definition: The random movement of gas or liquid particles from an area of high concentration to an area of low concentration
2. Gas particles diffuse quicker than liquid particles because the particles move faster and are already more spread out
  1. Particles in liquid are much closer so there is less space for particles to move without colliding with one another
3. Solid particles do not diffuse because they do not move out of position
4. Lighter particles diffuse faster than heavier particles

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	Creado por Selina Phadiya hace alrededor de 7 años