Answer Options:
Plate A: TNTC
Plate B: 360 colonies
Plate C: 60 colonies
Plate D: 10 colonies
Answer: Plate C: 60 colonies
Question: What is the molecular shape around the phosphorus atom in PH3?
Answer Options:
Linear
Bent
Trigonal planar
Tetrahedral
Trigonal pyramidal
Answer: Trigonal pyramidal
Question: Which measurement has the fewest number of significant figures?
Answer Options:
1.280 m
0.1280
0.001280
1280
All of the measurements have the same number of significant figures.
Answer: 1280
Question: What is the formula for the ionic compound formed when aluminum and sulfur combine?
Answer Options:
AlS
Al2S3
AlS3
Al2S
Al3S2
Answer: Al2S3
Question: How many total valence electrons does the polyatomic ion NH4+ possess?
Answer Options:
8
9
10
11
Answer: 8
Question: Approximately how many CFU would you expect to count if you plated 0.1 mL of a broth with a cell density of 3.50 x 10^2 CFU/mL?
Answer Options:
35 CFU
3.50 CFU
350 CFU
0.35 CFU
Answer: 35 CFU
Question: You have a culture with a cell density of 6.7 x 10^3 CFU/mL. What final dilution factor would give you countable plates from this culture?
Answer Options:
10^5
10^6
10^7
10^8
10^9
Answer: 10^6
Question: A syringe has a volume of 5.0 mL. What is this volume in deciliters?
Answer Options:
0.0005 dL
0.0050 dL
0.050 dL
0.50 dL
5.0 dL
Answer: 0.050 dL
Question: The purpose of performing serial dilutions and a standard plate count is to determine the _________.
Answer Options:
density of bacteria
identity of bacteria
source of bacteria
Answer: density of bacteria
Question: Select which of the following are examples of anions. Select all that apply.
Answer Options:
NH4+
Ni
Ca2+
Cl-
Ag+
Answer: Cl-
Question: If the density of a certain alcohol is 0.785 g/mL, what volume of the alcohol would have a mass of 75.0 g?
Answer Options:
95.5 mL
58.9 mL
Answer: 95.5 mL
Question: Carry out the following calculation and report the answer using the proper number of significant figures:
16.75 / 0.545
Answer Options:
31.0135 %
31.101 %
31.02 %
31.30 %
31.8 %
Answer: 30.73 %
Question: Approximately how many CFU would you expect to count if you plated 1.0 mL of a broth with a cell density of 3.52 x 10^2 CFU/mL?
Answer Options:
35 CFU
3.52 CFU
352 CFU
0.352 CFU
Answer: 352 CFU
Question: The number 0.0035880 expressed correctly using scientific notation is _________.
Answer Options:
0.0035889
3.5880 × 10^-3
3.5880 × 10^-2
3.5880 × 10^-4
Answer: 3.5880 × 10^-3
Question: Which particles are found in the atomic nucleus? Select all that apply.
Answer Options:
Protons
Electrons
Neutrons
Answer: Protons
Neutrons
Question: The symbol for the oxygen anion is O^2-. How many electrons does this anion have?
Answer Options:
6
8
10
Not enough information to determine.
Answer: 10