Oliver's science project consists of six sealed and labeled containers. He challenges his classmates to identify pure substances versus mixtures. Identify each substance as a pure substance or mixture.

Question

Air
Smog
Oxygen
Sugar
Coffee
Chocolate Milk

Answer 1

Here’s how each of the substances in Oliver's science project can be classified:

1. Air - Mixture (Air is a mixture of gases, primarily nitrogen and oxygen, along with smaller amounts of other gases.)
2. Smog - Mixture (Smog is a mixture of air pollutants, including fog, smoke, and other particulates.)
3. Oxygen - Pure substance (Oxygen in its diatomic form (O₂) is a pure substance, consisting only of oxygen molecules.)
4. Sugar - Pure substance (Table sugar, or sucrose, is a pure substance with a specific chemical formula.)
5. Coffee - Mixture (Coffee is a mixture of water, coffee solubles, oils, and other compounds.)
6. Chocolate Milk - Mixture (Chocolate milk is a mixture of milk, cocoa, sugar, and sometimes other ingredients.)

So the classifications are:

• Pure Substances: Oxygen, Sugar
• Mixtures: Air, Smog, Coffee, Chocolate Milk