1. Section 2.1 Review: “What Is Matter?”
Ch. 2: “Matter”
Section 2.1 Review: “What Is Matter?”

2. 1. Define chemistry.
Chemistry is the study of matter and how it changes.

3. 2. List the two types of pure substances.
Elements
Compounds

4. 3. Explain why light is not matter.
Light has neither mass nor volume.

5. 4. Complete the following analogy: A heterogeneous mixture is to a homogeneous mixture as immiscible liquids are to ___.
miscible liquids

6. 5. Classify each of the following as an element or a compound:
a. sulfur, S8
element
b. methane, CH4
compound
c. carbon monoxide, CO
d. cobalt, Co

7. 6. Describe the makeup of pure water, and write its chemical formula.
Water contains two hydrogen atoms and one oxygen atom; H2O.

8. 7. Compare and contrast mixtures and pure substances
7. Compare and contrast mixtures and pure substances. Give an example of each.
A pure substance, such a table salt (NaCl), has the same composition throughout and definite properties.
A mixture, such as air, contains more than one pure substance with various compositions.

9. 8. Critical Thinking
David’s statement reflects the common use of pure. Susan’s use of pure is more correct scientifically because honey is a mixture of several different compounds.