Question

which use of iron is due to its chemical properties?
producing colored sparks in fireworks
changing from liquid to gas at 2,862°c
conducting electricity and heat
changing from solid to liquid if heated to 1,538°c

Explanation:

Chemical properties involve a change in the substance's chemical composition. Producing colored sparks in fireworks is a chemical reaction where iron reacts with other substances to form new compounds (colored products). Changing from solid to liquid (melting) or liquid to gas (boiling) are physical changes (change in state, no new substance formed). Conducting electricity and heat is a physical property (no chemical change).

Answer:

Producing colored sparks in fireworks.