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

1. Iron's use in producing colored sparks in fireworks is due to its chemical properties. When iron is heated, it reacts with oxygen to produce iron oxide, which releases energy in the form of light, creating sparks. This is a chemical reaction involving the transformation of substances and the release of energy.2. The change from liquid to gas at and from solid to liquid if heated to are related to iron's physical properties, specifically its boiling and melting points. These changes of state do not involve a chemical reaction but rather a physical change.3. Conducting electricity and heat are also physical properties of iron. These properties are related to the ability of iron to transfer energy in the form of heat or electrical current without undergoing a chemical change.Therefore, the use of iron that is due to its chemical properties is the production of colored sparks in fireworks, as it involves a chemical reaction with oxygen.