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 Daltonís atomic theory, explaining how this postulate explains a scientific law.