#P6.2.1
explain the differences in density between the different states of matter in terms of the arrangements of the atoms or molecules
#P6.2.2
use the particle model of matter to describe how mass is conserved, when substances melt, freeze, evaporate, condense or sublimate, but that these physical changes differ from chemical changes and the material recovers its original properties if the change is reversed
#P6.2.3
use the particle model to describe how heating a system will change the energy stored within the system and raise its temperature or produce changes of state
#P6.2.4
explain how the motion of the molecules in a gas is related both to its temperature and its pressure: hence explain the relationship between the temperature of a gas and its pressure at constant volume
qualitative only