Question

Determine whether each statement is an example of a physical change or a chemical change.

Newspaper yellows in the sun.

physical

chemical
Wax melts on a hot stove.

physical

chemical

Answer 1

Newspaper yellows in the sun. — chemical change
(Exposure to light and oxygen causes lignin and other paper components to oxidize and form new, yellow compounds.)

Wax melts on a hot stove. — physical change
(Melting is a change of state only — no new substance is formed and it is reversible.)