G4

=Water = 1)Water can freeze - Freezing is a process in which a liquid turns into a solid when its temperature is lowered to below its freezing point -All known liquids, except liquid helium, freeze when the temperature is lowered enough. -Liquid helium remains liquid at atmospheric pressure even at absolute zero can only be frozen only under pressure.

2) Water can evaporate. -Evaporation is a type of vaporization of a liquid that occurs at only at the surface of a liquid. -The stronger the forces keeping the molecules together in the liquid state, the more energy one must get to escape. -The higher the density the slower the liquid evaporates. -For molecules of a liquid to evaporate, they must be located near the surface, be moving in the proper direction, and have sufficient kinetic energy to overcome liquid-phase intermolecular forces. -Evaporation happens faster if there is less exertion on the surface keeping the molecules from launching themselves. -When the molecules collide, they transfer energy to each other in varying degrees, based on how they collide.



3)water can condense - condensation occurs when hot water vapour comes into contact with a cooler surrounding - condensation is the liquidation of gas

4)Water can boil - Water boils at 100 degree celsius - Boiling is the process of the change of state of water from liquid state to gaseous state,due to heat loss