Question: Which compartment does adipose tissue belong to?
Answer Choices:
Fat Free Mass
Fat Mass
Answer: Fat Mass
Question: What device should you use if concentrated acid or base spills on your clothing?
Answer: Go to the safety shower and wash.
Question: What should you try first if a very small fire starts on your desk?
Answer: If a fire starts in a beaker or flask, cover the vessel with a flat object to cut off the supply of air.
Question: The following molecule is an example of which class of compounds?
Molecular Structure: CH3(CH2)4COOH
Answer Choices:
Hydrocarbon
Acid
Ester
Ether
Aldehyde
Answer: Acid
Question: The washing step of recrystallization removes which category of impurities?
Answer Choices:
a. on the surface of the solid
b. within the crystal lattice
Answer: a. on the surface of the solid
Question: Which compartment does skeletal muscle belong to?
Answer Choices:
Fat Free Mass
Fat Mass
Answer: Fat Free Mass
Question: The extrinsic eye muscle motor units contain only 8 to 12 muscle cells and in some cases as few as 2 or 3 muscle cells.
Answer Choices:
True
False
Answer: True
Question: The ability of a substance to withstand a temperature change is called _____.
Answer Choices:
Caloric content
Density
Joule
Specific heat
Answer: Specific heat
Question: The value that is altered when you compare an enzyme catalyzed reaction to a non-enzyme catalyzed reaction is called:
Answer Choices:
Ea
delta G
delta G double dagger
delta G naught
Answer: Ea
Question: The ΔG of a reaction:
Answer Choices:
will change if the temperature of the reaction is changed
will change if the concentration of reactants and products are changed
can be used to calculate whether a reaction is thermodynamically favorable under defined non-standard conditions.
the value alone can directly predict whether a reaction will be thermodynamically favorable under standard conditions.
is not related to the equilibrium constant.
Answer: can be used to calculate whether a reaction is thermodynamically favorable under defined non-standard conditions.
Question: What heat source should you use to heat flammable organic solvents?
Answer: Electrically heated sand bath
Question: a) Why, specifically, is the brow bar feature of chemical splash goggles critical for adequate splash protection? It protects from above the eyes.
b) Where should chemicals that can be irritating to one’s respiratory system be stored long term?
Answer: a) In a fume hood.
Question: How many calories in one kilocalorie?
Answer Choices:
1000
200
100
10
Answer: 1000
Question: Where should you dispose of disposable glassware?
Answer: Dispose of broken glass in a “broken glass” cardboard container.
Question: Where should you work when transferring irritating or poisonous substances?
Answer: Under a working exhaust hood.
Question: What is the Sun made of [approximately by mass]?
Answer Choices:
100 percent hydrogen and helium.
90 percent hydrogen, 2.5 percent helium, 2.5 percent other elements.
70 percent helium, 24 percent hydrogen, 2 percent other elements.
70 percent hydrogen, 28 percent helium, 2 percent other elements.
98 percent hydrogen, 2 percent helium and other elements.
Answer: 70 percent hydrogen, 28 percent helium, 2 percent other elements.
Question: The crystallization step of recrystallization removes which category of impurities?
Answer Choices:
a. on the surface of the solid
b. within the crystal lattice
Answer: b. within the crystal lattice
Question: Table of reagents: Use Table Feature on the choices above the text box to create a table with the required information.
Answer: The table contains molecular formula, molecular weight, melting point, boiling point, solubility, and density for cyclohexane and toluene.
Question: Determine the pKa for the following solution of acid containing [0.022] A- and [0.11] HA. The pH of the solution is 5.24.
Answer Choices:
4.10
4.76
5.90
6.5
7.00
Answer: 4.76
Question: Let’s consider that ethyl acetate is the ideal solvent for this TLC experiment. What might have happened to the spots if you had used [butyl] methyl ether as the eluent instead of ethyl acetate. Spots remain towards bottom of TLC plate because:
Answer: [Butyl/methyl ether] is less polar, cannot overcome attractions of sample to adsorbent.
Question: Rank Standards from Plate from Least to Most Polar:
Answer: Least Polar: Caffeine
2nd most polar: Acetaminophen
Most Polar: Aspirin
Question: Which of the following is not a homoglycan?
Answer Choices:
Cellulose
Glycogen
Starch
Heparin
Amylose
Answer: Heparin
Question: Why would water not be used to elute a column [besides its polarity] in column chromatography?
Answer: It would dissolve the silica gel in the column.
Question: You are given an unknown white solid to recrystallize in lab. The white solid could be Compound A (melting point 110-112°C), Compound B (melting point 165-167°C) or Compound C (melting point 154-157°C). Compound A, B and C are significantly soluble in butyl acetate (bp: 126°C), even at room temperature and not very soluble in water (bp: 100°C) or in n-butanol (bp: 117°C) (large difference in solubility of solid in water and n-butanol is significant). Butyl acetate is miscible with n-butanol but not with water.
Answer: Answer 1: hot butyl acetate
Answer 2: n-butanol
Answer 3: first signs of cloudiness
Answer 4: A
Question: Which of the following taste sensations is incorrectly matched to the chemicals that produce it?
Answer Choices:
bitter—alkaloids
umami—triglycerides and fatty acids
sour—acids
sweet—inorganic substances such as sugar and some lead salts
Answer: umami—triglycerides and fatty acids