Ch. 2: “Matter”
Section 2.1 Review: “What Is
Matter?”
1. Define chemistry.

Chemistry is the study of matter and
how it changes.
2. List the two types of
pure substances.


Elements
Compounds
3. Explain why light is not
matter.

Light has neither mass nor volume.
4. Complete the following analogy: A
heterogeneous mixture is to a homogeneous
mixture as immiscible liquids are to ___.

miscible liquids
5. Classify each of the following
as an element or a compound:
a. sulfur, S8
 element
b. methane, CH4
 compound
c. carbon monoxide, CO
 compound
d. cobalt, Co
 element
6. Describe the makeup of pure
water, and write its chemical
formula.

Water contains two hydrogen atoms
and one oxygen atom; H2O.
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.
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.