[untitled worksheet]

Target Language or Knowledge:

The three states of matter are solids, liquids and gases. When you heat or cool a substance, a change of state may occur. These changes of state occur at fixed temperatures unique to the substance involved. When a substance is changing state, the temperature stays constant. If enough thermal energy is added to a solid it will start to melt. Melting is the change of state from a solid to a liquid. The temperature at which the solid substance melts is called its melting point (MP). The melting point of ice is 0°C. If a liquid loses enough thermal energy it will turn into a solid. Solidification or freezing is the change of state from a liquid to a solid. The temperature at which a liquid becomes a solid is called its freezing point (FP). The temperature at which a substance freezes is the same as its melting point temperature. The freezing point of water is 0°C.

solids gases state fixed unique thermal energy temperature melting thermal liquid solid freezing