Final answer:
Materials that do not change shape are called solids, which maintain their shape due to tightly packed atoms. Physical properties, such as shape, do not change the chemical composition of the substance.
Step-by-step explanation:
Those materials that do not change their shape are typically called solids. Solids are one of the three basic states of matter, each with its own unique physical properties. In solids, the atoms are tightly packed together and are not free to move around very much, which gives solids a definite shape and volume. Unlike liquids that can flow and take the shape of their container or gases that entirely fill their container, solids maintain their shape unless a force is applied to deform them. However, physical changes, like bending, cutting, or crushing a solid, do not alter its chemical composition. It's important to differentiate this from a chemical change, where the actual chemical structure of the substance is altered. Physical properties are characteristics of matter that can be observed without changing its identity, such as color, odor, melting point, boiling point, and density.