which event always involves a chemical change?\nboiling\nmelting\nconducting\nburning

Answer:

D. burning

Explanation:

Step1: Define chemical change

A chemical change results in new substances.

Step2: Analyze boiling

Boiling is a physical change (liquid - gas), no new substances form.

Step3: Analyze melting

Melting is a physical change (solid - liquid), no new substances form.

Step4: Analyze conducting

Conducting involves flow of electrons, no new substances form.

Step5: Analyze burning

Burning is a chemical reaction, new substances like carbon - dioxide and water (for organic substances) are formed.