Science Assessment ~ Topics ~ Atoms, Molecules, and States of Matter ~ NGSS Link PS1.A-M.4

In a liquid, the molecules are constantly in contact with others; in a gas, they are widely spaced except when they happen to collide. In a solid, atoms are closely spaced and may vibrate in position but do not change relative locations.

Items associated with this NGSS statement in this project (Original Project) and key idea (There are differences in the spacin…)
Item ID Number	Item Description	Select This Item for My Item Bank
AM027003	Molecules are spaced farthest apart in a gas.
AM033003	Ice is harder than liquid water because the molecules of ice are linked more tightly together than the molecules of liquid water.
AM056003	The molecules of a gas are far apart from one another.
AM068003	Gases can be compressed more easily than solids because the molecules of gases are farther apart than the molecules of solids.
AM069002	The molecules of a gas are spread far apart throughout a sealed container.
AM071002	Liquid candle wax flows but solid candle wax does not because the molecules of liquid candle wax can easily move past one another but the molecules of solid candle wax cannot.
AM057005	Liquid water takes the shape of a cup it is poured into but solid ice cubes do not, because the molecules of liquid water can easily move past one another but the molecules of solid ice cannot.

Items associated with this NGSS statement in this project (Original Project) and other key ideas
AM028003	When a substance changes from a liquid to a solid, the molecules of the substance connect more strongly to one another.
AM031004	The bubbles that form when water boils are made of water molecules.
AM035004	When a piece of solid wax is heated, it becomes a liquid and the wax molecules become more loosely connected to each other.
AM062004	As water boils, the molecules become separated from each other.