Question

Multiple Choice Question
The diagram shows a chemistry demonstration.Sulfur
Iron filings
Iron sulfide
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.

Answer 1

The correct answer is:

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

In the first step, iron and sulfur are mixed together, forming a mixture (not a compound). When heated in the second step, they undergo a chemical reaction to form iron sulfide, which is a new compound. This is indicated in step three, where the result is a cooled product of that reaction.