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WorksheetsUnit 7 Test Review
Total questions: 20
Worksheet time: 20mins
Which two terms represent major categories of compounds?
ionic and nuclear
ionic and molecular
empirical and nuclear
empirical and molecular
A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test conclusion indicates that the compound is ionic?
Both the solid and the liquid are good conductors.
Both the solid and the liquid are poor conductors.
The solid is a good conductor, and the liquid is a poor conductor.
The solid is a poor conductor, and the liquid is a good conductor.
Which atom will form an ionic bond with a Br atom?
N
Li
O
C
Which phrase describes the molecular polarity and distribution of charge in a molecule of carbon dioxide, CO2?
polar and symmetrical
polar and asymmetrical
nonpolar and symmetrical
nonpolar and assymetrical
Which formula represents a polar molecule?
O2
CO2
NH3
CH4
The abnormally high boiling point of HF as compared to HCl is primarily due to intermolecular forces of attraction called
network bonds
electrovalent forces
van der Waals forces
hydrogen bonds
At STP, fluorine is a gas and bromine is a liquid because, compared to fluorine, bromine has
stronger covalent bonds
stronger intermolecular forces
weaker covalent bonds
weaker intermolecular forces
Which of these substances has the strongest intermolecular forces?
H2O
H2S
H2Se
H2Te
What is the correct formula of potassium hydride?
KH
KH2
KOH
K(OH)2
The correct name of the compound with the formula PbO2 is
lead (I) oxide
lead (II) oxide
lead (III) oxide
lead (IV) oxide
Which formula is correct for ammonium sulfate?
NH4SO4
(NH4)2SO4
(NH4)2SO3
NH4SO3
Which name correctly identifies the formula P2O5?
Phosphorus Oxide
Phosphorus Pentoxide
Diphosphorus Pentoxide
Diphosphide Pentoxide
What is the gram-formula (molar) mass of Fe(NO3)3?
146 g/mol
194 g/mol
214 g/mol
242 g/mol
A 1.0-mole sample of krypton gas has a mass of
19 g
36 g
39 g
84 g
What is the number of moles of CO2 in a 220.-gram sample of CO2? (gram-formula mass = 44 g/mol)?
0.20 mol
5.0 mol
15 mol
44 mol
What is the mass in grams of 2.0 moles of NO2?
92
60.
46
30.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram-formula mass = 120. grams per mole)?
20%
27%
46%
53%
The percent by mass of water in the hydrate Na2SO4 ⋅ 10 H2O is closest to
18%
44%
56%
76%
Vitamin C has an empirical formula of C3H4O3 and a molecular mass of 176. What is the molecular formula of vitamin C?
C3H4O3
C6H8O6
C9H12O9
C10H8O3
The empirical formula of a compound is CH3. The molecular formula of this compound could be
CH4
C2H4
C2H6
C3H6
