The shape of a liquid in a half-filled bottle is determined by the container, while a gas fills the entire volume of the container. A gas has a volume determined by the container, while the volume of a solid is fixed. Matter changes state, like from liquid to gas, when sufficient energy is added in the form of heat or temperature change to overcome the intermolecular forces binding the molecules.

1. SPONGE...States of Matter
1. THE SHAPE OF THE LIQUID IN A HALF
FILLED BOTTLE OF COKE IS DIFFERENT
FROM THE SHAPE A GAS IN THE SAME
BOTTLE. TELL HOW.
2. THE VOLUME OF A GAS IS DIFFERENT
FROM THE VOLUME OF A SOLID IN ONE
VERY IMPORTANT WAY. WHAT IS THE
DIFFERENCE?
3. WHAT CAUSES MATTER TO CHANGE
FROM ONE STATE (LIKE A LIQUID) TO
ANOTHER?