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WorksheetsSpring Semester Part I
Total questions: 40
Worksheet time: 40mins
Name
Class
Date
1.
A chemical formula includes the symbols of the elements in the compound and subscripts that indicate
a)
the number of moles in each element
b)
how many atoms or ions of each type are combined in the simplest unit
c)
the formula mass
d)
the charges on the elements or ions
2.
A chemical formula for a molecular compound represents the composition of
a)
a molecule
b)
an atom
c)
the ions that make up the compound
d)
the crystal lattice
3.
How many atoms of fluorine are present in a molecule of carbon tetrafluoride, CF4?
a)
1
b)
2
c)
4
d)
5
4.
Changing a subscript in a correctly written chemical formula
a)
changes the number of moles represented by the formula
b)
changes the charges on the other ions in the compound.
c)
changes the formula so that it no longer represents that compound
d)
has no effect on the formula.
5.
Which formula does NOT represent a molecule?
a)
H2O (water)
b)
NH3 (ammonia)
c)
CO2 (carbon dioxide)
d)
NaCl (table salt)
6.
What is the formula for zinc fluoride?
a)
ZnF
b)
ZnF2
c)
Zn2F
d)
Zn2F3
7.
What is the formula for the compound formed by calcium ions and chloride ions?
a)
CaCl
b)
Ca2Cl
c)
CaCl3
d)
CaCl2
8.
What is the formula for the compound formed by lead(II) ions and chromate ions?
a)
PbCrO4
b)
Pb2CrO4
c)
Pb2(CrO4)3
d)
Pb(CrO4)2
9.
What is the formula for aluminum sulfate?
a)
AlSO4
b)
Al2SO4
c)
Al2(SO4)3
d)
Al(SO4)3
10.
What is the formula for barium hydroxide?
a)
BaOH
b)
BaOH2
c)
Ba(OH)2
d)
Ba(OH)
11.
Name the compound Ni(ClO3)2.
a)
nickel chlorate
b)
nickel chloride
c)
nickel chlorite
d)
nickel peroxide
12.
Name the compound Zn3(PO4)2.
a)
zinc potassium oxide
b)
trizinc polyoxide
c)
zinc phosphate
d)
zinc phosphite
13.
Name the compound Fe(NO2)2.
a)
iron(II) nitrate
b)
iron(II) nitrite
c)
ferric nitrate
d)
ferrous nitride
14.
Name the compound CuCO3.
a)
copper(I) carbonate
b)
cupric trioxycarbide
c)
cuprous carbide
d)
copper(II) carbonate
15.
Name the compound CF4.
a)
calcium fluoride
b)
carbon fluoride
c)
carbon tetrafluoride
d)
monocarbon quadrafluoride
16.
Name the compound N2O4.
a)
sodium tetroxide
b)
dinitrogen tetroxide
c)
nitrous oxide
d)
binitrogen oxide
17.
Name the compound SO3.
a)
sulfur trioxide
b)
silver trioxide
c)
selenium trioxide
d)
sodium trioxide
18.
What is the formula for silicon dioxide?
a)
SO2
b)
SiO2
c)
Si2O
d)
S2O
19.
What is the formula for nitrogen trifluoride?
a)
NiF3
b)
NF3
c)
N3F
d)
Ni3F
20.
What is the oxidation number of oxygen in most compounds?
a)
-8
b)
-2
c)
0
d)
+1
21.
In a compound, the algebraic sum of the oxidation numbers of all atoms equals
a)
0
b)
1
c)
8
d)
the charge on the compound
22.
What is the oxidation number of hydrogen in KH?
a)
-1
b)
0
c)
+1
d)
+2
23.
What is the formula mass of magnesium chloride, MgCl2?
a)
46 amu
b)
59.763 amu
c)
95.211 amu
d)
106.354 amu
24.
The molar mass of NO2 is 46.01 g/mol. How many moles of NO2 are present in 114.95 g?
a)
0.4003 mol
b)
1.000 mol
c)
2.498 mol
d)
114.95 mol
25.
The molar mass of CCl4 is 153.81 g/mol. How many grams of CCl4 are needed to have 5.000 mol?
a)
5 g
b)
30.76 g
c)
769.0 g
d)
796.05 g
26.
The molar mass of LiF is 25.94 g/mol. How many moles of LiF are present in 10.37 g?
a)
0.3998 mol
b)
1.333 mol
c)
2.500 mol
d)
36.32 mol
27.
What is the percentage composition of CF4?
a)
20% C, 80% F
b)
13.6% C, 86.4% F
c)
16.8% C, 83.2% F
d)
81% C, 19% F
28.
What is the percentage composition of CuCl2?
a)
33% Cu, 66% Cl
b)
50% Cu, 50% Cl
c)
65.50% Cu, 34.50% Cl
d)
47.263% Cu, 52.737% Cl
29.
The percentage composition of sulfur in SO2 is about 50%. What is the percentage of oxygen in this compound?
a)
25%
b)
50%
c)
75%
d)
90%
30.
A formula that shows the simplest whole-number ratio of the atoms in a compound is the
a)
molecular formula.
b)
ideal formula.
c)
structural formula.
d)
empirical formula.
31.
The empirical formula is always the accepted formula for a(n)
a)
atom
b)
molecule
c)
molecular compound
d)
ionic compound
32.
The empirical formula for a compound shows the symbols of the elements with subscripts indicating the
a)
actual numbers of atoms in a molecule.
b)
number of moles of the compound in 100 g.
c)
smallest whole-number ratio of the atoms.
d)
atomic masses of each element.
33.
What is the empirical formula for a compound that is 31.9% potassium, 28.9% chlorine, and 39.2% oxygen?
a)
KClO2
b)
KClO3
c)
K2Cl2O3
d)
K2Cl2O5
34.
What is the empirical formula for a compound that is 53.3% O and 46.7% Si?
a)
SiO
b)
SiO2
c)
Si2O
d)
Si2O3
35.
A compound contains 259.2 g of F and 40.8 g of C. What is the empirical formula for this compound?
a)
CF4
b)
C4F
c)
CF
d)
CF2
36.
To find the molecular formula from the empirical formula, one must determine the compound's
a)
density
b)
formula mass
c)
structural formula
d)
crystal lattice
37.
The empirical formula and the formula mass of a compound are needed to determine the compound's
a)
molecular formula
b)
bond energy
c)
lattice structure
d)
toxicity
38.
A molecular compound has the empirical formula XY3. Which of the following is a possible molecular formula?
a)
X2Y3
b)
XY4
c)
X2Y5
d)
X2Y6
39.
Of the following molecular formulas for hydrocarbons, which is an empirical formula?
a)
CH4
b)
C2H2
c)
C3H6
d)
C4H10
40.
A compound's empirical formula is C2H5. If the formula mass is 58 amu, what is the molecular formula?
a)
C3H6
b)
C4H10
c)
C5H8
d)
C5H15
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