Question

What do these two changes have in common?

a) Melting wax
b) Ice crystals forming on a window
c) Both involve a change in physical state
d) Both involve a change in chemical composition

Answer 1

Both the melting of wax and the formation of ice crystals on a window involve a change in physical state. Therefore, the correct option is C.

Step-by-step explanation:

Melting wax and forming ice crystals are examples of physical processes as opposed to chemical ones. Wax melts without passing through any chemical changes; it just goes from a solid to a liquid state. Similar to this, water vapor changes physically from a gaseous to a solid state—that is, without changing chemically—when ice crystals develop on a window.

Physical changes are modifications to the state of matter, such as turning a substance from a solid into a liquid or gas, without changing the substance's chemical makeup.

Therefore, the correct option is C.