Question

some iron and sulfur are mixed together, then heated. when the result is cooled, the iron is chemically bonded with the sulfur. the result of heating the mixture was the formation of a(n) ________.

○ compound
○ element
○ homogeneous mixture
○ heterogeneous mixture

Explanation:

1. Recall the definitions: An element is a pure substance made of one type of atom. A mixture (homogeneous or heterogeneous) has components that are not chemically bonded. A compound is a substance formed when two or more elements are chemically bonded in a fixed ratio.
2. In the problem, iron (Fe) and sulfur (S) are heated and chemically bonded. So the result is a compound (like iron sulfide, FeS), not an element (since two elements combine) or a mixture (because mixtures don't involve chemical bonding).

Answer:

A. compound