Classifying Matter – Concept Practice

1. Differentiate between intensive and extensive properties. Give an example of each.

2. A student checks the volume, melting point, and shape of two unlabeled samples of matter and finds that the measurements are identical. From this he concludes that the samples have the same composition. What is wrong with this thinking?

3. How are atoms and molecules related to one another?Use examples to support your explanation.

4. What is an allotrope? Discuss an example.

5. Medicine bottles are often labeled "shake before using." What does this tell you about the composition of the medicine inside? Use the terms we have discussed related to classifying matter based on composition.

6. Classify the following as heterogeneous mixtures, solutions, compounds or elements

7. Classify the following changes a chemical or physical
a. silver tarnishing
b. wood burning
c. shortening melting on the stove
d. milk souring

8. Classify the following properties as chemical or physical – use a dictionary or your text to define any words you are not familiar with in order to complete this question.
a. heat conductivity
b. combustibility
c. resistance to acids
d. length
e. brittleness
f. malleabillity
g. boiling point

9. When brown, shiny copper metal is heated in concentrated nitric acid (which is clear in color), the copper dissolves to form a deep blue solution, and a brown gas is evolved from the acid. What observations are evidence of a chemical change?

10. From question 9, give a chemical and a physical property of copper.