Question

Which of the following would be classified as a physical change

a. a solid forms when two clear liquids are mixed
b. a matchsticks turns colors when it burns
c. a copper rod is hammered into a thin sheet
d. a gas is given off when two substances are mixed.

Answer 1

A physical change refers to a change in the physical properties of a substance without altering its chemical composition. When two clear liquids are mixed and a solid forms, it is still made up of the same substances, just in a different state.

Step-by-step explanation:

A physical change refers to a change in the physical properties of a substance, without altering its chemical composition. In the given options, the only choice that represents a physical change is a. a solid forms when two clear liquids are mixed. When two clear liquids are mixed and a solid forms, it is still made up of the same substances, just in a different state. The chemical composition of the substances does not change.