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CH 7 Chemical Formulas and Chemical Compounds

Total questions: 64

Worksheet time: 3hrs 47mins

Name
Class
Date
1.

When naming binary ionic compounds, you change the ending of the second element to ___.

a)

-ate

b)

-ite

c)

-ide

d)

-ine

2.

The _____ describes the atoms in a compound.

a)

Chemical Equation

b)

Chemical Formula

c)

Chemical Symbol

d)

Coefficient

3.

The name of FeCl₂ is

a)

iron chloride

b)

iron (II) chloride

c)

iron (I) chloride

d)

iron dichloride

4.

Which of these combinations is an ionic compound made of?

a)

Metal and Metal

b)

Nonmetal and Nonmetal

c)

Metal and Nonmetal

d)

Cation and Cation

5.

Name the ionic compound SnSe2

a)

Potassium diselenide

b)

Tin (IV) Selenide

c)

Cobalt selenide

d)

Sodium (II) triselenide

6.

What is the formula for Sodium Nitrate?

a)

NiN

b)

NN2

c)

N(NO3)2

d)

NaNO3

7.
What is the name of K3PO4?
a)

Tetrapotassium Phosphate

b)

Tetrapotassium Phosphite

c)

Heptapotassium phosphite

d)
Potassium phosphate
8.

The name of SO3 is?

a)

sulfate

b)

sulfur oxiatic

c)

sulfur trioxide

d)

Heptasulfur tetraxide

9.
Magnesium bromide is an ionic compound with the chemical formula MgBr₂.  What does the "2" tell you?
a)
There are 2 bromide ions for every magnesium ion
b)
Bromide has a 2- charge
c)
Bromide has a 2+ charge
d)
There are 2 magnesium ions to every bromide ion
10.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
11.

What is the molar mass of calcium hydroxide, Ca(OH)2?

a)

74.1 g/mole

b)

57.1 g/mole

c)

58.1 g/mole

d)

57.1 u

12.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
13.
PBr5
a)
Phosphorus Bromide
b)
Phosphorus Pentabromide
c)
Pentaphosphorus bromide
d)
Phosphorus Bromine
14.
What is the formula for hexasulfur decoxide?
a)
SO
b)
S6O10
c)
S3O5
d)
S10O6
15.
Molecular compounds contain
a)
1 metal and 1 nonmetal
b)
only metals
c)
only nonmetals
d)
more than 2 elements (either metal or nonmetal)
16.
P4S3
a)
Phosphorus Trisulfide
b)
Tetraphosphorus Trisulfide
c)
Pentaphosphorus Trisulfide
d)
Tetraphosphorus Tetrasulfide
17.
NO
a)
Nitrogen oxide
b)
Mononitrogen monoxide
c)
Nitrogen monoxide
d)
Nitrogen monoxygen
18.
What is the formula for Tricarbon Octahydride?
a)
Ca3O
b)
C2H8
c)
C3H8
d)
Ca3H8
19.
Disulfur trioxide
a)
S3O2
b)
SO
c)
S2O3
d)
S2O
20.

The chemical formula of dinitrogen tetroxide is

a)

Ni₂O₄

b)

NiO

c)

N₂O₄

d)

NiO₂

21.
What is the formula for manganese(III) oxide?
a)
MgO
b)
Mg2O3
c)
MnO
d)
Mn2O3
22.
Roman numerals tell you the ____ of the metal cation(s) in an ionic compound.
a)
number
b)
mass
c)
type
d)
charge
23.
What is the formula for phosphorous acid?
a)
H3PO4
b)
H2PO4
c)
H3P
d)
H3PO3
24.
What is the formula for Hydrosulfuric Acid?
a)
H2(SO3)
b)
H2S
c)
H2(SO2)
d)
H2(SO4)
25.
What is the formula for Nitric Acid?
a)
HNO2
b)
HNO3
c)
HNO4
d)
H2NO3
26.
Name HF
a)
hydrofluoric acid
b)
Hypofluoric acid
c)
hydrogen fluorine acid
d)
fluoric acid
27.
What determines the number of hydrogens in your acid?
a)
there are always just one
b)
its the same as the charge of hydrogen
c)
its the same as the charge of the anion
d)
magic
28.
What is the oxidation number of O in CO2?
a)
+2
b)
-1
c)
+4
d)
-2
29.
What is the oxidation number of N in NO21- ?
a)
-3
b)
+4
c)
-2
d)
+3
30.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
31.
What is oxidation number of Mn in MnO2 ?
a)
0
b)
+2
c)
-2
d)
+4
32.
What is the oxidation number of S in SO4 2-  ?
a)
-2
b)
+2
c)
+6
d)
-4
33.
What is oxidation number of Cr in
Cr2O72-?
a)
-2
b)
+2
c)
+6
d)
+12
34.
What is oxidation number of P in K3PO4?
a)
+1
b)
+5
c)
-2
d)
0
35.

Oxidation number of O in the compound H2O2:

a)

0

b)

-1

c)

-2

d)

+2

36.

Oxidation number of H in NaH:

a)

0

b)

+1

c)

-1

d)

+2

37.

What is the oxidation state of H in H2?

a)

+2

b)

+1

c)

0

d)

None of the above

38.

What is the oxidation number for O2

a)

-2

b)

-1

c)

0

d)

+2

39.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

a)

29%

b)

43%

c)

57%

d)

73%

40.

What percentage of the total atomic mass of carbon monoxide (CO) is composed of oxygen?

a)

29%

b)

43%

c)

57%

d)

73%

41.

What percentage of the total atomic mass of magnesium bromide (MgBr2) is composed of magnesium?

a)

13%

b)

43%

c)

63%

d)

87%

42.

What percentage of the total atomic mass of lithium phosphide (Li3P) is composed of phosphorus?

a)

13%

b)

29%

c)

40%

d)

60%

43.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
44.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
45.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)
46.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
47.

What is the empirical formula for C4H6?

a)

CH

b)

CH3

c)

C2H3

d)

C4H6

48.

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

a)

SO

b)

SO2

c)

SO3

d)

SO4

49.

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

NaPO4

50.

A compound consists of 72.2% magnesium and 27.8% nitrogen by mass. What is the empirical formula?

a)

Mg4N3

b)

MgN2

c)

Mg3N2

d)

MgN

51.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
52.

Given the following, determine the empirical formula: 42.07% sodium, 18.89% phosphorus, and 39.04% oxygen.

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

Na3PO3

53.

A sample contains 36.95 g of mercury (Hg) and 13.05 g of chlorine (Cl). What is the empirical formula for this compound?

a)

HgCl2

b)

Hg3Cl

c)

Hg17Cl36

d)

HgCl

54.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
55.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
56.

2.40 g of an explosive, J, contains 0.473 g of nitrogen. J also contains 33.8% carbon and 1.41% hydrogen by mass. The remainder of J is oxygen.


What is the empirical formula of J?

a)

C4HNO2

b)

CH2N2O

c)

C2HNO2

d)

CHNO

57.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
58.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)
K8SO16
c)
K8S4O8 
d)
K8S4O16 
59.
EF = CF2 
Molecular formula mass = 192
MF =
a)
C4F8
b)
C4F
c)
CF8
d)
C2F4
60.
When calculating the EF the mole ratio is given as follows:
H1O3.5
What will the EF be?
a)
H1O3.5
b)
HO3.5
c)
HO4
d)
H2O7
61.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
62.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
63.

Phenyl magnesium bromide is used as a reagent in organic synthesis. Determine its molecular formula if its molar mass is 181.31 g/mol and it contains 39.75% C, 2.78% H, 13.41% Mg, and 44.07% Br (these are in the correct order).

a)

C12H10Mg2Br2

b)

CHMgBr

c)

C6H5MgBr

d)

C3H2.5MgBr

64.

A compound has the molar mass of 170.0 g/mol and an empirical formula of SiF3. The compounds molecular formula is

a)

SiF3

b)

Si2F6

c)

Si5F15

d)

Si4F12

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