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CHEM101 PRE-TEST #3 (Chapters 5,6,7 & 8)
Multiple Choice: Read each question and all of the choices. Select the BEST answer for each question and
mark your answer on your scantron. (4 points each)
- A sample of gas has an initial temperature of 37.
o
C at an unknown volume. When the sample is heated to a
temperature of 74.
o
C, its volume increases to 4.57 L. What was its initial volume?
A. 2.32 L B. 8.98 L C. 4.09 L D. 1.32 L E. 4.57 L
- A snorkeler takes a syringe filled with 16 mL of air from the surface, where the pressure is 1.0 atm, to an
unknown depth. If the volume of the air in the syringe at this depth is 7.5 mL, what is the new pressure?
A. 2.13 atm B. 0.469 atm C. 16.0 atm D. 4.09 atm E. 5.25 atm
- How many moles of CO 2
are contained in a 5.00 L tank at 428 K and 2.80 atm?
A. 0.399 B. 1.10 C. 2.51 D. 0.455 E. 0.
- A balloon has been sitting in a refrigerator for over 1 hour. When the balloon is removed from the
refrigerator and placed outside on the patio on a sunny day, what difference would you see after a couple of
minutes, AND whose law would this enforce?
A. deflate, Charles’ B. inflate, Charles’ C. deflate, Boyle’s D. inflate, Boyle’s
- Doubling the pressure halves the volume of a sample gas at constant temperature pertains to which law?
A.Boyle’s B. Charles’ C. Avogadro’s D. Ideal E. Combined gas
- At STP, one mole of any ideal gas produces a volume of what?
A. 22.4 L B. 22.4 mL C. 224 L D. 0.224 mL E. 0.0224 mL
- The volume of a gas is inversely proportional to the pressure of a gas is known as
A. Avogadro's Law
B. Ideal Gas Law
C. Charles's Law
D. Boyle's Law
E. Dalton's Law
- A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.41 atm. What is the identity of
the halogen?
A. Br 2
B. F
C. Cl 2
D. I
E. Ge
- What is the Celsius temperature of 100.0 g of chlorine gas in a 55.0-L container at 800 mm Hg?
A) -23°C
B) 228°C
C) 250°C
D) 500°C
- Which of the following is TRUE if ΔEE sys
= - 95 J?
A. The system is gaining 95 J, while the surroundings are losing 95 J.
B. The system is losing 95 J, while the surroundings are gaining 95 J.
C. Both the system and the surroundings are gaining 95 J.
D. Both the system and the surroundings are losing 95 J.
E. None of the above are true.
- Which of the following processes is endothermic?
A. the freezing of water
B. the combustion of propane
C. a hot cup of coffee (system) cools on a countertop
D. the chemical reaction in a "hot pack" often used to treat sore muscles
E. the vaporization of rubbing alcohol
- Which of the following processes is exothermic?
A. the formation of dew in the morning
B.the melting of ice
C. the chemical reaction in a "cold pack" often used to treat injuries
D. the vaporization of water
E. None of the above are exothermic.
- In which orbital below would an electron (on average) be farthest from the nucleus?
A. 1s
B. 4f
C. 3s
D. 3d
E. 2p
- How many unpaired electrons are present in the ground state P atom?
A) 0
B) 3
C) 1
D) 2
E) 4
- Identify the correct values for a 4f sublevel.
A) n = 3, l = 1, m l
B) n = 2, l = 1, m l
C) n = 1, l = 0, m l
D) n = 2, l = 0, m l
E) n = 4, l = 3, m l
- Identify the element that has a ground state electronic configuration of [Kr]5s
4d
A. Tc
B. Mn
C. Nb
D. Ru
- What is the orbital designation for an electron with the quantum numbers n = 3, = 2?
A. 3s
B. 3d
C. 2p
D. 2f
- Which element would have the highest first ionization energy?
A. lithium
B. oxygen
C. fluorine
D. neon
- Electron affinity increases going__________a column.
A. left to right
B. right to left
C. down
D. up
- The atomic radius of germanium (Z = 32) is smaller than the atomic radius of potassium (Z = 19) because of
________
A. a change in the n quantum number.left to right
B. an increase in the effective nuclear charge.right to left
C. the fact that p and d orbitals have the same orbital penetration.down
D. a decrease in the effective nuclear charge.up
- Place the following elements in order of increasing atomic radius.
P Ba Cl
A. Ba < P < Cl
B. P < Cl < Ba
C. Cl < P < Ba
D. Cl < Ba < P
E. Ba < Cl < P
- What is the maximum number of d orbitals that are possible?
A) 1
B) 3
C) 7
D) 5
E) 10
