Kinetic Theorey Flashcards
All matter is made of molecules in some kind of…
Motion
Name the three states of matter
Three states of matter: solid, liquid and gas
Describe a solid’s shape and volume
Solids:
- hold shape
- have a fixed volume
Describe a liquid’s shape, surface and volume
Liquids:
- shape of container
- free surface
- fixed volume
Describe a gas’s shape and volume
Gases:
- shape of container
- volume of container
In solids, the molecules vibrate about…
Fixed positions
Explain the forces between molecules in solids
- the molecules in solids have strong, attractive forces between them and so are packed very close together
- therefore, solids have a high density
In liquids, the forces between the molecules are…
Weaker than in solids
Explain the molecule spacing in liquids
- in liquids the molecules are farther apart than in solids
- this means liquids have a lesser density
Describe the molecules in liquids
- in liquids the molecules are not in fixed positions
- the molecules move around in all directions within the liquid
What are the forces between the molecules like in gases?
- the forces between the molecules in gases are almost zero
Explain molecule spacing in gases
- in gases the molecules are very far apart
- and so gases have a very low density
Describe molecule movement in gases
- in gases the molecules move very quickly in random directions
- they collide with each other and the walls of the container
When will materials change state?
Materials will change state when heat energy is added to them or subtracted from them
What happens to the spacing of the molecules when a change of state occurs and how does this affect the density?
When a change of state occurs:
- the spacing of the molecules will change
- therefore the density will change
