Chemistry (Chang), 10th Edition

Chapter 2: Atoms, Molecules, and Ions

Self Assessment B

1
The fact that when 48.6 g of magnesium completely reacts with 32.0 g of oxygen, exactly 80.6 g of magnesium oxide is formed illustrates
A)the law of definite proportions.
B)the law of conservation of mass.
C)the law of multiple proportions.
D)Dalton's description of the atom.
E)None of the above.
2
Why was it more difficult to design an experiment that would prove the existence of neutrons than it was to design an experiment that would prove the existence of either protons or electrons?
A)Neutrons are smaller than either protons or electrons, so their presence is much more difficult to detect.
B)Because neutrons are 1840 times heavier than protons, they are difficult to separate, and therefore, to count.
C)Neutrons do not deflect charged particles.
D)The similarity of the magnetic and electrical properties of protons and neutrons made them experimentally indistinguishable.
3
How many protons, neutrons, and electrons are there in an atom of potassium-40?
A)19 protons, 21 neutrons, and 19 electrons
B)40 protons, 19 neutrons, and 40 electrons
C)21 protons, 19 neutrons, and 19 electrons
D)19 protons, 21 neutrons, and 40 electrons
E)19 protons, 19 neutrons, and 21 electrons
4
Which of the following is a halogen?
A)S
B)Ca
C)Fe
D)Cl
E)Rb
5
The 80Br- ion has
A)45 protons, 35 neutrons, 45 electrons.
B)35 protons, 45 neutrons, 34 electrons.
C)35 protons, 45 neutrons, 36 electrons.
D)45 protons, 35 neutrons, 46 electrons.
E)35 protons, 45 neutrons, 46 electrons.
6
C(graphite) and C(diamond) are examples of:
A)isotopes of carbon.
B)allotropes of carbon.
C)the law of definite proportions.
D)different carbon ions.
7
What binary compound would be formed from barium ions and fluoride ion?
A)Ba2F3
B)BaF3
C)BaF
D)Ba2F
E)BaF2
8
The Stock system name for Fe2O3 is
A)iron trioxide.
B)iron oxide
C)iron trioxide(II).
D)iron(III) oxide.
E)iron(II) oxide.
9
The correct chemical formula for chromium(III) nitrite is
A)Cr(NO2)3.
B)CrNO3.
C)Cr3(NO2)2.
D)Cr(NO3)3.
E)Cr2 (NO2) 3.
10
The chemical name for SO32- (aq) is sulfite ion. Therefore, the chemical name of H2SO3 (aq) is
A)dihydrosulfuric acid.
B)sulfurous acid.
C)dihydrogen sulfite.
D)hyposulfurous acid.
E)sulfuric acid.
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