Chemistry Reference
In-Depth Information
Try the following practice questions and check your answers at the end
of the chapter, before moving on to the next lesson.
Lesson 1-1 Review
1.
A substance that is made up of only one type of atom is called
a(n)_______________.
2.
Two or more substances physically combined form
a(n)______________.
3.
Two or more substances chemically combined are called
a(n)_______________.
4.
Sand is a good example of a(n) ______________ mixture.
5.
_______________ elements, such as oxygen (O
2
), are found in nature
in their elemental form as two-atom molecules.
6.
Which of the following substances cannot be broken down by
ordinary chemical reactions?
a) water
c) carbon dioxide
b) gold
d) glucose
7.
Which of the following substances does not possess uniform
composition?
a) pure water
b) salt water
c) helium gas
d) salad
8.
Which of the following is made up of only one type of atom?
a) NO
b) He
c) CO
d) MgS
9. Which of the following represents a mixture?
a) NaCl
(s)
b) NaCl
(l)
c) NaCl
(g)
d) NaCl
(aq)
10. Which of the following shows a ternary compound?
a) CO
b) NaCl
c) NH
3
d) NaNO
2
Lesson 1-2: Phases of Matter
All of the matter that we encounter in our normal day is found in one of
the three phases: solid, liquid, or gas. Have you ever stopped to think about
the difference between these forms of matter? Why are some substances
solid at room temperature whereas others are liquids or gases? Why do gases
spread out and escape from containers that are able to hold solids and liq-
uids? We will explore the difference between the phases in this lesson.
