Chem 305, Spring 2019
EXAM 1
Name________________________
Section/Possible Points
Multiple Choice – 28
Questions
Score
70 points possible
Short Answer Question 1
6 points
Short Answer Question 2
8 points
Short Answer Question 3
8 points
Short Answer Question 4
8 points
Bonus
Total out of 100
Instructions:
Multiple Choice (MC): Choose the most correct answer from the possible choices. To receive credit for your
answer you must record the answer on your scantron. You may write on the exam, but answers recorded on
the exam and not transferred to the scantron will not receive credit.
True/False (T/F): Indicate whether the statement is true or false on your scantron by bubbling in A for true
and B for false. Answers recorded on the exam and not transferred to the scantron will not receive credit.
Short Answer: Record your answers to these problems on the exam. To receive credit you must show all
work.
No cell phones, graphing calculators, apple watches, fit bits or other programmable electronic devices
Keep your eyes on your paper and good luck!
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Chem 305, Spring 2019
Multiple Choice and True/False (28 questions, 70 points total)
EXAM 1
1. (T/F) The three states of matter are solids, liquids, and gases.
2. (MC) Which of the following is a characteristic of both liquids and gases?
a. defined shape
b. defined volume
c. indefinite volume
d. indefinite shape
e. none of these
3. (MC) In which of the following pairs of properties are both properties physical properties?
a. The compound has a melting point of 73°C and decomposes upon heating
b. The compound is reactive in air and blue in color
c. The compound has a boiling point of 100°C and a freezing point of 0°C
d. The compound resists rusting and melts at 0°C
e. None of the above
4. (MC) Which of the following changes is a chemical change?
a. Melting of ice
b. Pulverizing of hard sugar cubes
c. Rusting of iron
d. More than one correct response
e. No correct response
5. (MC) Which of the following statements about heterogeneous mixtures is correct?
a. It is possible to have heterogeneous mixtures in which all the components are liquids.
b. A heterogeneous mixture contains one distinct phase.
c. All of the phases in a heterogeneous mixture must be in the same state.
d. No two phases in a heterogeneous mixture can be in the same state.
e. None of the above
6. (MC) The difference between an element and a compound is:
a. an element is a pure substance, whereas a compound is not.
b. an element can be broken into simpler constituents by physical means, whereas a compound can not.
c. an element can be broken down into a simpler substance by chemical means, whereas a compound
can not.
d. an element cannot be broken down into simpler substances by chemical means, whereas a compound
can.
e. None of the above
7. (T/F) A molecule of caffeine (chemical formula C8H10N4O2) can be considered a pure mixture of elements.
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Chem 305, Spring 2019
EXAM 1
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8. (MC) The melting point of bromine is 7.2 C and the boiling point is 58.9 C. What is the state of bromine at
0oC?
a. solid
b. liquid
c. gas
d energy
e. none of these
9. (MC) Which of the following (a-d) below lists the correct chemical symbols for the elements chlorine,
calcium, carbon, oxygen and neon?
a. Cl, Ca, O, Ne
b. Mg, Br, Ca, N
c. Cl, Cd, C, O, Ne
d Cl, Ca, C, O, Ne
10. (T/F) A molecule of Aspirin has the chemical formula C9H8O4 and can be characterized as a heteroatomic
compound.
11. (MC) The compound salinosporamide A is currently under investigation as a potential anticancer drug. It
turns out that the oxygen atoms present in this molecule are particularly important for the compound’s
chemical properties. A single molecule of salinosporamide A has the chemical formula C15H20ClNO4
How many atoms of oxygen are present in three molecules of salinosporamide A?
a.
b.
c.
d.
e.
20 atoms
12 atoms
4 atoms
8 atoms
16 atoms
12. (MC) How many grams are in 151 kilograms?
a. 1.51 x 103 grams
b. 1.51 x 104 grams
c. 1.51 x 105 grams
d. 151 grams
e. none of the above
13. (MC) Which of the following digits in the measurement 654,300 seconds is an estimated digit?
a. the last digit
b. the next to last zero
c. the three
d. more than one correct response
e. no correct response
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Chem 305, Spring 2019
EXAM 1
14. (MC) Perform the following calculation and provide the answer (a-e) below with the correct number of
significant figures:
6.63 X 5.0 X 4.555 =
a. 150.998
b. 151.0
c. 151
d. 150
e. none of the above
15. (MC) Round 0.01235 to 3 significant figures.
a. 0.012
b. 0.0124
c. 0.0123
d. 0.01
e. none of these
16. (MC) How many significant figures are in 1,000,300,000,000?
a. 1
b. 13
c. 4
d. 5
e. none of these
17. (MC) If liquid A weighs 6.0 grams and has a volume of 3.0 mL and liquid B weighs 9.0 grams and has a
volume of 2.25 mL, then which of the following is true? (hint: recall that density = mass/volume)
a. Liquid B is less dense than A.
c. When mixed together, liquid B will float on
liquid A.
b. Liquid A and B have equal densities.
d. When mixed together, liquid A will float on
liquid B.
18. (MC) Which of the following statements regarding the nucleus is correct?
a. the nucleus contains only neutrons
b. the nucleus contains protons and electrons
c. the nucleus is always positively charged
d. the nucleus contains electrons and neurons
e. none of these is correct
19. (MC) Chemical properties of an element are determined by the arrangement of its_______
a. protons
b. protons and neutrons
c. protons and electrons
d. electrons
e. none of the above
20. (MC) The difference in the mass numbers of the two isotopes of bromine, 81Br and 79Br, results from
a. 81Br having one more electron than 79Br
b. 81Br having two more electrons than 79Br
c. 81Br having one more neutron than 79Br
d. 81Br having two more neutrons than 79Br
e. 81Br having two more protons than 79Br
21. (MC) Groups IA and VIIA are commonly referred to as:
a. alkali metals and noble gases
b. alkali metals and halogens
c. alkaline earth metals and halogens
d. noble gases and halogens
e. none of the above
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Chem 305, Spring 2019
EXAM 1
22. (T/F) Nonmetals are good conductors of heat and electricity where as metals are poor conductors of heat
and electricity.
23. (T/F) A more detailed explanation for why atoms in a group within the periodic table (e.g. the halogens)
have similar chemical properties is that they have the same electron configurations in their outer shells.
24. (MC) Specific heat is defined as
a. The quantity of heat energy required to raise 1 kg of a substance by 10 degrees Celsius.
b. The quantity of heat energy, in coulombs, necessary to raise the temperature of a substance by 1
degree Celsius.
c. The quantity of potential energy, in calories, required to raise the temperature of 1 gram of a
substance by 1 degree Celsius
d. The quantity of heat energy, in Joules or calories, necessary to raise the temperature of 1 gram of a
substance by 1 degree Celsius.
e. None of these is correct
25. (MC) Which of the following is the correct units for specific heat?
a. Coulombs
b. g/J
c. J/g°C
d. C/g
e. none of these is correct
26. (MC) Which of the following is true regarding specific heat?
a. The higher the specific heat of a substance the more its temperature will change when it
absorbs a given amount of energy
b. The lower the specific heat of a substance the less its temperature will change when it absorbs a
given amount of energy
c. Compared to a substance with a low specific heat, a substance with a high specific heat can
absorb a lot of energy before its temperature increases.
d. Compared to a substance with a high specific heat, a substance with a low specific heat can
absorb a lot of energy before its temperature increases.
e. none of these statements is correct
27. (MC) Rank the elements F, B, Be, Li and Cl in order of increasing electronegativity (least electronegative
first)
a. F < B < Be < Li < Cl
b. Li <B < Be < Cl < F
c. Li <Be <B < F < Cl
d) Li <Be< B < Cl <F
e. none of these is correct
28. (MC) Rank the elements F, B, Be, Li and O in order of increasing ionization energy (lowest ionization energy
first)
a. F < B < Be < Li < O
b. Li <B < Be < O < F
c. Li <Be <B < O < F
d. Li < Be < O< B <F
e. none of the above
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Chem 305, Spring 2019
EXAM 1
Short Answer Problems (5 questions, 30 points total) – you must show your work to receive credit. Where
applicable provide all answers to the correct number of significant figures.
1. (6 points) Please record the following measurements in the spaces provided below. Being sure to
include units.
Ruler:
Buret: (mL)
Graduated Cylinder (mL)
Answers:
ruler:____________ Thermometer:__________
Graduated Cylinder:_________
2. (8 points) Find the mass, in kg, of an object that has a density of 8.912 g/mL and a volume of 1.00 kiloliter
(kL).
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Chem 305, Spring 2019
EXAM 1
3. (8 points) Specific Heat. A piece of metal with a mass of 20.0 g at 90.0 °C is added to 60.0 g of water at 20.0
°C. The final temperature of the metal and water (4.18J/g°C) is 27.5 °C. Calculate the heat absorbed by the
water.
4. (8 points) Complete the following chart
Element
Symbol
Atomic
Number
40
Mass
Number
14
17
# Protons
# Neutrons
# Electrons
6
9
19K
Bonus Questions (5 points) – Do not attempt until you’ve finished the exam. Record your answers below
(not on the scantron)
1. (T/F) The three subatomic particles that make up an atom are electrons, protons and neutrons.
2. (T/F) The base metric units of mass, volume and length are the pound, gallon, and meter.
3. Perform the following calculation
135.45g – 105.45g
2.00mL
=
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