Chem 1010 - General Chemistry 1 » Summer 2021 » Exam 1 (B)
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Question #1
Pure acetic acid (HC 2H 3O 2) is a liquid and is known as glacial acetic acid. Calculate the molarity of a solution prepared by dissolving 10.00 mL of glacial acetic acid at 25°C in sufficient water to give 500.0 mL of solution. The density of glacial acetic acid at 25°C is 1.05 g/mL.
A.
0.0210 M
B.
1.26 × 103 M
C.
21.0 M
D.
0.350 M
E.
3.50 × 10-4 M
Question #2
Give the mass percent of carbon in C 14H 19NO 2.
A.
38.89%
B.
5.17%
C.
72 .07%
D.
2.78%
Question #3
What is the empirical formula of a compound that is 62.0% C, 10.4% H, and 27.5% O by mass?
A.
C6HO3
B.
C3H6O
C.
C5H10O2
D.
C6H12O2
E.
C3HO
Question #4
A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution?
A.
3.65 M
B.
0.356 M
C.
0.274 M
D.
2.81 M
Question #5
If the walls in a room are 955 square feet in area, and a gallon of paint covers 15 square yards, how many gallons of paint are needed for the room? (3 ft = 1 yd)
A.
47 gallons
B.
24 gallons
C.
7.1 gallons
D.
21 gallons
E.
2.3 gallons
Question #6
Which of the following represents a physical property?
A.
Sodium metal is extremely reactive with chlorine gas.
B.
Mercury is a silvery liquid at room temperature.
C.
Aluminum has a tendency to "rust."
D.
Argon has an unreactive nature.
E.
Butane is highly flammable.
Question #7
Define potential energy.
A.
energy associated with the gravity of an object
B.
energy associated with the temperature of an object
C.
energy associated with the motion of an object
D.
energy associated with the force of an object
E.
energy associated with the position or composition of an object
Question #8
How many moles are in 2.16 x 10 24 atoms of lead?
A.
3.59 moles
B.
1.79 moles
C.
35.9 moles
D.
0.359 moles
E.
6.08 moles
Question #9
Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances: X-45 44.8776 amu 32.88%, X-47 46.9443 amu 67.12%
A.
45.91 amu
B.
46.84 amu
C.
46.34 amu
D.
46.26 amu
E.
44.99 amu
Question #10
How many atoms are in 2.50 moles of CO 2?
A.
7.53 x 1023 atoms
B.
3.01 x 1024 atoms
C.
1.52 x 1024 atoms
D.
5.02 x 1023 atoms
E.
4.52 x 1024 atoms
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