Question

Discuss whether each of the following is a mixture or a pure substance. If it is a mixture, please state if it homogeneous or heterogeneous. Please give your reasoning for each case. If it is difficult to tell, explain why.

1. Seawater.
2. Chocolate.
3. Table sugar.
4. An apple.
5. A sheet of paper
6. The spice paprika.
7. Seven Up.

Answer 1

Pure substance:

• Seven up
• Table sugar
• Seawater (H20 + NaCl + impurities)

Mixtures:

• Chocolate (homogeneous)
• Paprika spice (homogeneous)
• Seawater (heterogeneous, because of impurities)
• A sheet of paper (homogeneous)
• An apple (heterogeneous)

Step-by-step explanation:

Pure substances exists as either elements or compounds.

A homogeneous mixture has even distribution and a single phase composition of its constituents; whereas heterogeneous mixtures are not uniform and constituents exist in different phases.