Test Bank for Chemistry The Molecular Nature of Matter and
Change 7th Edition by Silberberg ISBN 007351117X
9780073511177
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Chapter 2: The Components of Matter
1. Kaolinite, a clay mineral with the formula Al4Si4O10(OH)8, is used as a filler in slick-
paper for magazines and as a raw material for ceramics. Analysis shows that 14.35 g of
kaolinite contains 8.009 g of oxygen. Calculate the mass percent of oxygen in kaolinite.
A) 1.792 mass % D) 34.12 mass %
B) 24.80 mass % E) 55.81 mass %
C) 30.81 mass %
Ans: E Difficulty: M
2. Compound 1 has a composition of 46.7 mass % of element A and 53.3 mass % of
element B. A and B also form a second binary compound (compound 2). If the
compositions of the two compounds are consistent with the law of multiple proportions,
which of the following compositions could be that of compound 2?
A) 23.4 mass % A 76.6 mass % B D) 53.3 mass % A 46.7 mass % B
B) 30.4 mass % A 69.6 mass % B E) 73.3 mass % A 26.7 mass % B
C) 33.3 mass % A 66.7 mass % B
Ans: B Difficulty: M
3. What are the approximate carbon:hydrogen mass ratios in methane (CH4) and ethyne
(C2H2)?
A) 1:4 and 1:1 D) 3:2 and 12:1
B) 3:2 and 6:1 E) 3:1 and 6:1
C) 3:1 and 12:1
Ans: C Difficulty: M
4. J. J. Thomson studied cathode ray particles (electrons) and was able to measure the
mass/charge ratio. His results showed that
A) the mass/charge ratio varied with as the cathode material was changed.
B) the charge was always a whole-number multiple of some minimum charge.
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,C) matter included particles much smaller than the atom.
D) atoms contained dense areas of positive charge.
E) atoms are largely empty space.
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, Ans: C Difficulty: E
5. Who is credited with measuring the mass/charge ratio of the electron?
A) Dalton B) Gay-Lussac C) Thomson D) Millikan E) Rutherford
Ans: C Difficulty: E
6. Who is credited with first measuring the charge of the electron?
A) Dalton B) Gay-Lussac C) Thomson D) Millikan E) Rutherford
Ans: D Difficulty: E
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, 7. Millikan's oil-drop experiment
A) established the charge on an electron.
B) showed that all oil drops carried the same charge.
C) provided support for the nuclear model of the atom.
D) suggested that some oil drops carried fractional numbers of electrons.
E) suggested the presence of a neutral particle in the atom.
Ans: A Difficulty: E
8. In a Millikan oil-drop experiment, the charges on several different oil drops were as
follows: –5.92; –4.44; –2.96; –8.88. The units are arbitrary. What is the likely value of
the electronic charge in these arbitrary units?
A) –1.11 B) –1.48 C) –2.22 D) –2.96 E) –5.55
Ans: B Difficulty: M
9. Who is credited with discovering the atomic nucleus?
A) Dalton B) Gay-Lussac C) Thomson D) Millikan E) Rutherford
Ans: E Difficulty: E
10. Rutherford bombarded gold foil with alpha () particles and found that a small
percentage of the particles were deflected. Which of the following was not accounted
for by the model he proposed for the structure of atoms?
A) the small size of the nucleus
B) the charge on the nucleus
C) the total mass of the atom
D) the existence of protons
E) the presence of electrons outside the nucleus
Ans: C Difficulty: M
11. Which one of the following statements about atoms and subatomic particles is correct?
A) Rutherford discovered the atomic nucleus by bombarding gold foil with electrons.
B) The proton and the neutron have identical masses.
C) The neutron's mass is equal to that of a proton plus an electron.
D) A neutral atom contains equal numbers of protons and electrons.
E) An atomic nucleus contains equal numbers of protons and neutrons.
Ans: D Difficulty: M
12. The chemical symbol for potassium is
A) P. B) Po. C) Pt. D) Pm. E) K.
Ans: E Difficulty: E
13. Which of the following symbols does not represent an element?
A) O2 B) Co C) HF D) Cs E) Xe
Ans: C Difficulty: E
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