Chemistry (Chang), 10th Edition

Chapter 2: Atoms, Molecules, and Ions

Self Assessment A

1
The existence of Cu2O 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
Rutherford's 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)Ca3PO4
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)2SO3 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 H2O is:
A)cuprous sulfate pentahydrate
B)copper(II) sulfate pentahydrate
C)copper(II) sulfate hydrate
D)copper(I) sulfate pentahydrate
E)copper sulfate pentahydrate
11
Who were the scientists most responsible for the present day model of the atom?
A)Marie Curie and Husband
B)Rutherford and Associates
C)Robert Andrews Millikan
D)Wilhelm Röntgen and Antoine Becquerel
12
A molecule is .....
A)an atom or group of atoms with a net positive charge.
B)an atom or group of atoms with a net negative charge.
C)at least two atoms in a definite arrangement held together by chemical bonds.
D)a single element with a different number of neutrons than the original.
13
Polyatomic molecules contain:
A)two different types of atoms
B)two of the same types of atoms
C)only two atoms of the same or different type
D)more than two atoms of the same or different type
14
Common examples of diatomic molecules from Group 7A elements include:
A)fluorine, hydrogen, and nitrogen
B)nitrogen, chlorine, and bromine
C)chlorine, bromine, and iodine
D)iodine, lead, and oxygen
15
What is the correct empirical formula ratio for hydrazine?
A)1:2
B)1:1
C)2:2
D)2:4
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