Question

How are chemical changes different from physical changes? (1 point)
• They involve heat.
They include shifts in the phase of
matter.
• They form new substances.
• They are reversible.

Answer 1

Chemical changes are different from physical changes primarily because **they form new substances**. In a chemical change, the composition of the original substance is altered, resulting in the creation of one or more new substances with different properties. In contrast, physical changes do not alter the chemical composition of a substance; they merely change its form or state (such as melting or boiling), and the original substance can often be recovered.