Introduction to Chemistry
Matter and Change
For the 1987 Copyright of The Addison Wesley Textbook
2) Describe ten important safety procedures that you should follow when working in the
laboratory.
3) What is the importance of an experimental control in an experiment?
4) What is meant by the physical properties of a substance? The chemical properties?
5) What is the difference between a homogeneous mixtrue and a heterogeneous mixture?
Give one example of each.
6) Use a specific example to explain what is meant by the law of conservation of matter.
7) Classify each of the following as a physical change or a chemical change:
a. dissolving sugar in a glass of ice tea
b. a bicycle rusting on the lawn
c. scrambling an egg
d. cooking the scrambled egg
7) When a stick of butter is left on the kitchen table, it softens gradually rather than melting
at a specific temperature, or melting point. Is butter a pure substance? Why or why not?
8) What methods could be used to help determine whether a substance is an element or a
compound?
9) Describe your activities from the time you wake wake up in the morning until the time
you arrive at school in terms of energy transformations or transfers.
10) Suggest a method for separating the components of saliva, a homogeneous solution
containing many different substances.
