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Chemistry, 7/e
Raymond Chang, Williams College

Atoms, Molecules, and Ions

Self Assessment A



1

The existence of Cu2 O and CuO illustrates
A)the law of conservation of mass.
B)the law of multiple proportions
C)the law of definite proportions.
D)A and B.
E)A, B, and C.
2

Rutherfords experiment with alpha particle scattering by gold foil established that:
A)electrons have negative charges.
B)protons are 1840 times heavier than electrons.
C)protons are not evenly distributed throughout an atom.
D)atoms are composed of protons, neutrons, and electrons.
E)protons are located in the nucleus of an atom.
3

How many protons, neutrons, and electrons are there in an atom of chlorine-39?
A)17 protons, 17 neutrons, and 22 electrons
B)39 protons, 38 neutrons, and 39 electrons
C)22 protons, 17 neutrons, and 17 electrons
D)17 protons, 39 neutrons, and 17 electrons
E)17 protons, 22 neutrons, and 17 electrons
4

Two isotopes of an element differ in their
A)chemical symbols.
B)atomic masses.
C)atomic numbers.
D)numbers of protons.
E)numbers of electrons.
5

Which of the following is not an example of an alkali metal?
A)Li
B)Cs
C)At
D)K
E)Rb
6

How many protons and electrons are present in a Ca2+ ion?
A)20 protons and 18 electrons
B)18 protons and 20 electrons
C)20 protons and 21 electrons
D)20 protons and 19 electrons
E)22 protons and 20 electrons
7

What is the formula for the ionic compound formed by calcium ions and phosphate ions?
A)CaPO4
B)Ca2 (PO4 )2
C)Ca(PO4 )3
D)Ca3 PO4
E)Ca3 (PO4 )2
8

The correct Stock system name for CoCl3 is
A)cobaltous chloride.
B)cobalt trichloride.
C)cobalt(III) chloride
D)cobalt(III) trichloride.
E)cobalt chloride.
9

The correct name of (NH4 )2 SO3 is
A)ammonia sulfite.
B)ammonium sulfate.
C)ammonia sulfate.
D)ammonium sulfite.
E)ammonium hyposulfite.
10

The correct Stock system name for CuSO4 . 5 H2 O is
A)cuprous sulfate pentahydrate.
B)copper(II) sulfate pentahydrate.
C)copper(II) sulfate hydrate.
D)copper(I) sulfate pentahydrate.
E)copper sulfate pentahydrate.