1. Physics: Concepts and Connections, 4th ed
Physics: Concepts and Connections, 4th ed., Art Hobson Chapter 2 – Atoms

2. B and C must be chemical compounds A must be a chemical compound
Suppose that a particular chemical substance A is "pure" [contains no "impurities"], and that it can be chemically decomposed into two other pure materials B and C. What conclusion can be draw from this?
B and C must be elements
A must be an element
B and C must be chemical compounds
A must be a chemical compound
Nonsense -- it is impossible to decompose a pure substance into two other materials.
Answer: D
Page Ref: Section 2.2

3. An odor, such as the odor of bread, is due to
an electromagnetic wave emitted by the source [the bread]
individual atoms that detach from the source and diffuse individually through the air
C) molecules that detach from the source and diffuse through the air
D) a pressure wave, similar to a sound wave, emitted by the source
E) cosmic vibrations emanating from the Great Pumpkin
Answer: C
Page Ref: Section 2.3

4. At the microscopic level, the difference between liquids and solids is that
A) the liquid's atoms move throughout the liquid, while the solid's atoms remain near their original locations
B) there is much more distance [at least 10 times more] between neighboring atoms in a liquid than between neighboring atoms in a solid
C) in a liquid, the individual atoms are larger
D) both answers "A" and "B" are correct
E) both answers "B" and "C" are correct
Answer: A
Page Ref: Section 2.3

5. The distance to the sun is about 150 million km
The distance to the sun is about 150 million km. Expressed in powers of ten, this is
A) 1.5 × 106 km
B) 1.5 × 108 km
C) 1.5 × 10-6 km
D) 1.5 × 10-8 km
E) None of the above
Answer: B
Page Ref: Section 2.4

6. The universe is only seconds old, a million trillion seconds in fact
The universe is only seconds old, a million trillion seconds in fact. In powers of 10, this number is
A) 1015
B) 1017
C) 1018
D) 1019
E) 1021
Answer: C
Page Ref: Section 2.3

7. Comparing the size of a wavelength of light with the size of an atom
A) atoms are much larger
B) some lightwaves are larger than atoms, but others are smaller than atoms
C) some atoms are larger than a lightwave, but others are small than a lightwave
D) they are about the same size
E) atoms are much smaller
Answer: E
Page Ref: Section 2.5

8. Which scientific theory or theories of the atom agrees with all of the atomic experiments performed to date?
A) The planetary theory of the atom
B) The Greek theory of the atom
C) The quantum theory of the atom
D) Both the planetary theory and the quantum theory of the atom
E) None of the above theories agree with all of the atomic experiments performed to date.
Answer: C
Page Ref: Section 2.7

9. A feature of the quantum model of the atom that is not a feature of the Greek or planetary models is that
A) The quantum model is only a theory, whereas the other two models are supported by factual evidence.
B) The quantum model of the atom cannot be visualized.
C) Both of the above
D) The quantum model can explain electrical effects.
E) All of the above
Answer: B
Page Ref: Section 2.7

10. Chemically, clean [non-polluted] air is
A) an element
B) a compound
C) an isotope
D) a mixture of different compounds
E) mostly oxygen
Answer: D
Page Ref: Section 2.8

11. Which is the better deal: small (8”) pizzas for $4
Which is the better deal: small (8”) pizzas for $4.99 each, or large (16”) pizzas for $12.99 each?
A) Small pizzas
B) Large pizzas
Answer: B because small pizzas cost $0.10/sq.in. while large pizzas cost only $0.07/sq.in. (a cost savings of approximately 50%!)

12. ? A) B) C) D) E)
Answer: A
Page Ref: Section 2.3