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12 Cards in this Set

  • Front
  • Back

Describe a Solid

Fixed volume and shape


Cant be compressed

Describe a Liquid

Fixed volume but change shape


Can occupy more space than solids

Describe a Gas

No fixed shape or volume


Can be compressed

Describe the particle theory for a solid

Particles dont move about. They are packed together and vibrate

Describe the particle theory for a liquid

Particles close together but move past each other

Describe the particle theory for a gas

Particles arent packed together


Particles move about quickly

What happens at a substances melting point

Solid to liquid. Enough energy is supplied to cause the vibrating particles to move

What happens at a substances boiling point

Liquid to gas. As temperature increases, rate of evaporation increases

Are melting and boiling point reactions reversible?

Yes

What is sublimation

When a solid turns directly to gas, missing the liquid stage in an experiment

Why does the temperature of a substance remain constant at melting point

Enough energy is supplied to the particles to break their bonds and as a result temp remains constant until all the bonds are broken and then it starts to rise again

What are the problem of the particle theory

Assumes atoms are spheres with no empty space within them and dont vary in size.