CHE 17 Name

Spring 1997

Quiz 1

1. Explain how a hypothesis and a theory are different.

2. Explain how pure substances differ from mixtures, using chemical examples.

3. The speed of light is 3.0 x 10⁸ m/s. How fast is this speed in miles per hour? Show your work for full credit! (1 km = 0.621 miles)

4. Describe one of the postulates of Dalton’s atomic theory, explaining how this postulate explains a scientific law.