Question | Answer |
Matter | Anything that occupies space and has mass. All matter is made up of moving particles |
Examples of matter | wood, air, rock and metal. (W.A.R.M.) |
Examples of pure substances of matter (all parts are chemically identical) | sugar and salt |
change of state | when matter changes from one form to another. |
types of change in state | in volume and density but not total mass |
the three states of matter | solids, liquids and gases |
solid particles | are vibrating but have a fixed shape and stay in the same position. They are strongly attracted to each other and are regularly arranged and close together. |
liquid particles | are moving rapidly but are close together, can change their shape and are attracted to each other. They have no fixed position and a randomly arranged. |
gas particles | are moving rapidly in all directions, take on the shape of their container. They are randomly arranged, far apart and are not attracted to each other. |
expansion | is when you heat solids, liquids and gases. the particles don't get bigger but they get further apart |
diffusion | when moving particles spread out and mix together. |
changing from one state to another | energy is needed |
melting point | the temperature at which particles MOVE away from their FIXED position |
boiling point | the temperature at which particles BREAK away from each other completely and turn into bubbles of gas. |
pressure | when gas particles pound against the walls of their container. Higher the temperature the greater the pressure. |
density | |
evaporation | |
expansion | |