8.
which of these is a pure substance?
o
a) bread
c) soil from the garden
b) table salt
i d) sea water
melted candle wax has no fixed shape, but it does have a fixed
volume. thus melted candle wax is a
a) solid
c) liquid
b) pure substance
d) gas
o
10.
a sealed metal container holds a gas. what happens when the
container is heated?
i
a) the gas exerts more pressure
c) the mass of the gas increases
b) the gas decreases in volume
d) the weight of the gas decrease
11.
list each container that contains molecules.
substances in three containers
- carbon atom
- snygen atom
- iplogen stem