Benchmark 4D
The Physical Setting: Structure of Matter
Grades K-2, page 76

Things can be done to materials to change some of their properties, but not all materials respond the same way to what is done to them.

NSES Content Standard B
Physical Science: Properties of objects and materials 
Grades K-4, page 127 
Materials can exist in different states--solid, liquid, and gas. Some common materials, such as water, can be changed from one state to another by heating or cooling.