Match these items.

1
.
0 degrees Celsius

amount of matter in object
2
.
chemical property

upward force of a fluid on an object
3
.
buoyancy

fixed shape
4
.
gas

freezing point of water
5
.
mass

expands
6
.
solid

no definite internal order
7
.
crystalline

molecules far apart
8
.
frozen water

fixed internal order
9
.
amorphous

ability to react with another substance

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.