Physical Science 1 Exam 2b
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1.
(2 pts.) Heat energy is transferred from
a. more dense objects to less dense objects
b. less dense objects to more dense objects
c. “warm” objects to “cool” objects
d. “cool” objects to “warm” objects
e. both c and d
2.
(2 pts.) Carbon 14 (C-14; 146 C ) is a radioactive form of carbon that is used in
determining the age of organic material (e.g. wood, leather) up to about 60,000
years old. Carbon 14 is a(n) ________ of carbon.
a. nucleotide
b. isotope
c. allotrope
d. ion
3.
(2 pts.) The hottest objects glow
a. blue
b. orange
c. yellow
d. red
e. white
4. (2 pts.) Liquid water is densest at
a. 4°C
b. 10°C
c. 0°C
d. None of these- it is always the same density.
5. (2 pts.) Solid metals tend to ________ when they are heated.
a. bend
b. contract
c. expand
d. remain the same
6. (2 pts.) The direct conversion from the solid phase to the gas phase is known as
a. melting
b. condensation
c. deposition
d. boiling
e. sublimation
7. (2 pts.) When you stand next to, but not touching, a warm object, the heat is
transferred to you by means of which method(s):
a. convection
b. conduction
c. radiation
d. both a and b
e. both a and c
8. (2 pts.) Choose the correct definition for a liquid:
a. closely-packed molecules with specific volume but shape changes with
container.
b. “fixed” molecules with constant shape and volume.
c. rapidly moving molecules; conform to volume & shape of container.
d. hot gas of electrically charged particles.
9. (2 pts.) Water waves are a type of
a. imaginary wave
b. longitudinal wave
c. transverse wave
d. electromagnetic wave
10. (2 pts.) The solubility of solids generally ___________ with temperature.
a. increases
b. decreases
c. remains constant
11. (2 pts.) Which of the following radiations has the shortest wavelength?
a. Infrared
b. Visible
c. Ultraviolet
d. X-rays
12. (2 pts.) Biochemists
a. study chemical reactions that occur in living organisms.
b. apply theories of physics.
c. identify and quantitate substances.
d. study non-carbon compounds.
e. study carbon-containing compounds.
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13. (2 pts.) You walk into a chemistry lecture late just as a professor drops a small
crystal of a solid into a container with a clear liquid. Upon the crystal contacting the
liquid, the liquid quickly turns into a solid. Based on these observations, you can
conclude that the liquid was a _________ solution.
a. unsaturated
b. saturated
c. super saturated
d. heterogeneous
14. (2 pts) A bowl of minestrone soup containing whole beans, pasta, celery, carrots and
tomatoes in a broth is a __________ mixture.
a. saturated
b. super saturated
c. heterogeneous
d. homogeneous
15. Which one of these is a property of metals?
a. nonductile
b. brittle if a solid
c. poor conductors of heat and electricity
d. malleable
e. all of these are properties of metals
16. (2 pts.) NH4+ is known as a(n)
a. isotope
b. anion
c. cation
d. allotrope
17. (2 pts.) What is the most abundant element in the Universe?
a. oxygen
b. carbon
c. hydrogen
d. nitrogen
18. (2 pts.) Which is the largest atom?
a. phosphorous
b. magnesium
c. chlorine
d. argon
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19. (2 pts.) Carbon dioxide (CO2) is a(n)
a. element
b. compound
c. diatomic element
d. heterogeneous mixture
e. both b and d
20. (2 pts.) The solubility of gases generally ___________ with pressure.
a. increases
b. decreases
c. remains constant
21. (2 pts.) The direct conversion from the gas phase to the liquid phase is known as
a. melting
b. condensation
c. deposition
d. boiling
e. sublimation
22. (2 pts.) Bromine (atomic #35) is known as a(n)
a. alkali metal
b. alkaline Earth metal
c. halogen
d. noble gas
23. (2 pts.) The mass of the electron is
a. equal to the mass of a proton
b. about 1000 times greater than the mass of a proton
c. zero
d. about 1000 times less than the mass of a proton
24. (2 pts.) Within a row, which elements tend to have the highest ionization energy?
a. alkali metals
b. alkaline Earth metals
c. halogens
d. noble gases
25. (2 pts.) Valence electrons
a. occupy the outermost electron shell (or orbital) of an atom
b. equal 3 for aluminum
c. give the element it’s chemical reactivity
d. all of the above
e. none of the above
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26. (2 pts.) Identify this ion: SO42a. sulfate
b. sulfide
c. sulfur oxide
d. sulfur tetroxide
27. (4 pts.) Give the correct formula (including charge) for the hydroxide ion.
28. (4 pts.) Give the correct name for this compound: Al2O3.
29. (4 pts.) Write the correct formula for calcium nitride.
30. (4 pts.) Give the correct name for this compound: P2O5.
31. (3 pts.) Draw the Lewis (dot) structure for carbon dioxide (CO2).
32. (3 pts.) Draw the Lewis (dot) structure for ammonia (NH3).
33. (2 pts.) What is the molecular mass (MW) of ethanol (C2H6O)?
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34. (2 pts.) What is the charge (sign and magnitude) of a sodium ion?
35. (2 pts.) What is the charge (sign and magnitude) of an iodide ion?
36. (12 pts.) Fill in the blanks with the correct information.
Atomic
Symbol
Si
Atomic
mass
28
Number of
protons
24
Number of
neutrons
28
46
69
Br
119
Number of
electrons
Charge
0
+4
36
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37. (3 pts.) What is the frequency of a wave (in Hz) that has a period of 2.0 seconds?
38. (4 pts.) Microwaves are a form of electromagnetic radiation that range in frequency
from 300 MHz to 300 GHz. What wavelength corresponds to the lowest frequency
of microwave radiation (300 MHz)?
39. (3 pts.) A temperature of 75.2 °F is equivalent to what temperature in °C?
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40. (2 pts.) Liquid oxygen (O2(l)) boils at -183 °C. What is it’s boiling point in Kelvin?
41. (8 pts.) How much heat energy must be removed from 10.2 kg of water to lower the
temperature of the water from 62.8 °C to -12.3 °C?
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