Chemistry Reference
In-Depth Information
15. Which of the following represents the correct formula for magnesium
hydroxide?
a) MgOH b) Mg(OH)
2
c) MgOH
2
d) Mg
2
OH
16. Which of the following represents the correct formula for barium
chloride?
a) Ba(Cl)
2
b) BaCl
2
c) Ba
1
Cl
2
d) Ba
2
Cl
17. Which of the following shows the proper empirical formula for a
compound with the molecular formula, C
4
H
8
?
a) C
4
H
8
b) C
2
H
4
c) CH
3
d) CH
2
18. How many oxygen atoms are shown in the expression 5Ca(NO
2
)
2
?
a) 2 b) 4 c) 10 d) 20
19. Which of the following compounds has a molecular mass of 44.08 u ?
a) CO b) NO c) CCl
4
d) C
3
H
8
20. The formula mass of CaCl
2
is closest to which of the following?
a) 40.0 u
b) 75.5 u
c) 111 u
d) 134 u
Part IV—Writing Formulas
Write the correct chemical formula for each of the following compounds.
21. nitrogen (V) oxide _______________________________________
22. strontium bromide _______________________________________
23. magnesium sulfide _______________________________________
24. copper (II) nitrate ________________________________________
25. barium carbonate ________________________________________
Answer Key
The actual answers will be shown in brackets, followed by the explana-
tion. If you don't understand an explanation that is given in this section, you
may want to go back and review the lesson that the question came from.
Lesson 5-1 Review
1.
[0]—According to Rule #1, the oxidation number for each atom of a free
element, such as N
2
, is equal to 0.
