Question

step 1: iron and sulfur are mixed together in a test - tube. step 2: the test tube is heated. step 3: the test tube is allowed to cool. which statement best describes this demonstration? a. step one contains a compound, which is chemically combined in step two, forming a mixture in step three. b. step one contains a compound, which is physically combined in step two, forming a mixture in step three. c. step one contains a mixture of elements, which are physically combined in step two, forming a new compound in step three. d. step one contains a mixture of elements, which are chemically combined in step two, forming a new compound in step three.

Explanation:

In step 1, iron and sulfur are just physically mixed, forming a mixture of elements. In step 2, heating causes a chemical reaction where they chemically combine to form a compound. In step 3, the new compound cools.

Answer:

C. Step one contains a mixture of elements, which are physically combined in step two, forming a new compound in step three.