PCP-Diagnostic Exam Flashcards
The total number of electrons at the fourth energy level is
A. 2
B. 8
C. 18
D. 32
D. 32
The halogen with the highest electronegativity is
A. fluorine
B. chlorine
C. bromine
D. iodine
A. fluorine
The geometry of the SO3 molecule is best described as
A. linear
B. trigonal planar
C. tetrahedral
D. bent
B. trigonal planar
Only two isotopes of copper are present in naturally occurring copper: 62Cu (62.9298 u) and 65Cu (64.9278 u). Calculate the percent composition of naturally occurring 62Cu using atomic mass of 63.546 u.
A. 69.17%
B. 30.83%
C. 46.65%
D. 53.35%
A. 69.17%
If 5.0 E 10 barium (Ba) atoms could be arranged side by side, they would form a straight line measuring 22 m. What is the diameter of Ba in pm? In A?
A. 44 pm, 0.44 A
B. 4.4. pm, 440 A
C. 440 pm, 4.4. A
D. 220 pm, 2.2. A
C. 440 pm, 4.4. A
Maleic acid contains 41.4% carbon, 3.47% , and 55.1% oxygen by weight. A 0.050-mole sample of this sample of this compound weighs 5.80 g. What is the molecular formula of maleic acid?
A. CHO
B. C2H2O2
C. C3H3O
D. C4H4O4
D. C4H4O4
A special-purpose piece of laboratory glassware, called pycnometer, is used to measure liquid densities. It has a volume of 25 cc, and a mass of 17.24 g when it is full of air. When filled with a liquid of unknown density, its mass = 45.0 g. What is the density of this liquid?
A. 1.11 g/mL
B. 1.25 g/mL
C. 1.42 g/mL
D. 1.55 g/mL
A. 1.11 g/mL
An 8.24-gram sample of a hydrated salt is heated until it has a constant mass of 6.20 grams. What was the percent by mass of water contained in the original container?
A. 14.1%
B. 32.9%
C. 24.8%
D. 75.2%
C. 24.8%
Pure acetic acid, known as glacial acetic acid, is a liquid with a density of 1.049 g/mL at 25°C. Calculate the molarity of a solution of acetic acid made by dissolving 10.0 mL of glacial acetic acid at 25°C in enough water to make 100 mL of solution.
A. 1.665 M
B. 1.747 M
C. 100.0 M
D. 104.9 M
B. 1.747 M
Calculate the molarity of a 5.00 ppm Ca(NO3)2 solution. Ca=40; N=14; 0=16
A. 2.56 E-6 M
B. 2.56 E-5 M
C. 3.05 E-5 M
D. 3.05 E-6 M
C. 3.05 E-5 M
How many milliliters of water must be added to 5 mL of 12 M HCl solution to make a 3 M HCl solution?
A. 10 mL
B. 15 mL
C. 20 mL
D. 25 mL
B. 15 mL
What type of colloid is mayonnaise?
A. Aerosol
B. emulsion
C. solid foam
D. sol
B. emulsion
A current of 0.1000 ampere is passed through a copper sulphate solution for 10 minutes using platinum electrodes. Calculate the number of grams of copper deposited at the cathode from CuSO4 solution.
A. 0.01975 g
B. 0.0243 g
C. 0.0385 g
D. 0.0457 g
A. 0.01975 g
The wavelength of a beam is 24 micrometer. What is its wave number?
A. 380/cm
B. 417/cm
C. 440/cm
D. 490/cm
B. 417/cm
A fossil fern containing 0.110 lbm of carbon is carbon dated to determine its age. The decay rate of C-14 in the fossil is 191 decays/min. How old is the fern? (The half-life of C-14 is 5730 years, and the rate decay of C-14 in a living organism is 6800 decays/min-lbm C.)
A. 7290 yrs
B. 11300 yrs
C. 14100 yrs
D. 23800 yrs
B. 11300 yrs
Consider the reaction Pb2+(aq) + 2Cl- (aq) → PbCl2 (s) H= -22.53 kJ/mol. Calculate H when 0.230 mol of PbCl2 (s) is dissolved in water.
A. 5.18 kJ
B. -5.18 kJ
C. 22.5 kJ
D. -22.5 kJ
A. 5.18 kJ
At what temperature do the Celsius scale and Fahrenheit scale readings have the same numerical value?
A. 40°C or 40°F
B. 32°C or 32°F
C. -40°C or -40°F
D. -100°C or 100°F
C. -40 C or -40 F
Two gas storage bulbs are at the same temperature. The 1 L bulb contains 0.50 atm of helium and the 2 L bulb contains 1 atm nitrogen. The valves connecting the two bulbs are opened and they are connected through a negligible volume. The pressure in the bulbs after they have pressure equilibrated and are at the initial temperature is
A. 1.50 atm
B. 0.67 atm
C. 0.50 atm
D. 0.84 atm
D. 0.84 atm
A volume of dry gas measures 85 mL at 21°C and 758 mmHg. What volume would this gas occupy if collected over water at 755.5 mmHg at 25°C?
A. 85 mL
B. 86.5 mL
C. 69 mL
D. 83.2 mL
C. 69 mL
A mixture consisting of 0.100 mol N2, 0.05 mol O2, 0.20 mol CH4, and an unknown amount of CO2 occupied a volume of 9.6 L at 27°C and 1 atm pressure. How many moles of CO2 are there in this sample?
A. 0.04 mol
B. 0.05 mol
C. 0.10 mol
D. 0.39 mol
A. 0.04 mol
Helium and argon are monoatomic gases and their atomic weights are 4 and 40 respectively. Under identical conditions helium will diffuse through a semipermeable membrane
A. 3.16 times as fast as argon
B. 1.58 times as fast as argon
C. 7.32 times as fast as argon
D. 10 times as fast as argon
A. 3.16 times as fast as argon
At 20°C and one atmosphere, one liter of water will absorb 0.043 g of oxygen or 0.19 g of nitrogen. Atmospheric air is 20.9% oxygen by volume, and the remainder is assumed to be nitrogen. What mass of oxygen will be absorbed by one liter of water exposed to 20°C air at one atmosphere?
A. 0.009 g
B. 0.150 g
C. 0.23 g
D. 0.043 g
A. 0.009 g
At 0°C the average velocity of methane molecules in air is 600 m/s. what is the total kinetic energy of 1.00 mol of methane molecules moving at this speed?
A. 4.78 E-21 J
B. 2.88 E 3 J
C. 5.76 E 3 J
D. 1.80 E 5 J
C. 5.76 E 3 J
The molecular diameter of CO is 3.19×10-6 cm, at 300K and pressure of 100 mmHg. What is the mean free path of the gas in cm?
A. 6.06×10-6
B. 6.86×105
C. 6.86×10-3
D. 2.86×10-4
C. 6.86×10-3
What is the pH of a 0.30 M s olutionof benzoic acid, Ka = 6.6E -5?
A. 0.52
B. 2.4
C. 4.7
D. 4.2
C. 4.7
Calculate the pH of an aqueous buffer solution which contains 0.100 mol/L NH3 and 0.200 mol/L NH4Cl.
A. 9
B. 8.5
C. 7.0
D. 10
A. 9
At equilibrium, a 1-liter reactor contains 0.3 mol of A, 0.1 mol of B and 0.6 mol 0f C, according to the equation: A + B → C. If 0.4 mol of A was added, how many moles of A was left under equilibrium was re-established?
A. 0.65
B. 0.05
C. 0.35
D. 0.70
A. 0.65
The solubility of barium carbonate is 1.4 E-3 g/ 100 mL solution. Determine its Ksp.
A. 5 E-9
B. 4 E-7
C. 4.5 E-8
D. 5.6 E-1
A. 5 E-9
Who discovered positron?
A. Anderson
B. Pauli
C. Heisenberg
D. Bohr
A. Anderson
An atomic face-centered cubic central crystal is 3.92 angstrom on an edge and has a density of 21.5 g/cm3. What is its atomic weight?
A. 195
B. 207
C. 48.8
D. 108
A. 195
Magnesium is obtained from
A. Sea shells
B. bentonite
C. sea water
D. corals
C. sea water
How many mililiters of 0.01000 N Ba(OH)2 are theoretically required to titrate 0.03000 g of H3AsO4 to the formation of Ba(H2AsO4)2?
A. 16.4 mL
B. 17.6 mL
C. 18.9 mL
D. 21.14 mL
D. 21.14 mL
Ethers are formed from condensation reactions between
A. alcohols and aldehydes
B. others and acids
C. aldehydes and acids
D. alcohols and acids
D. alcohols and acids
What is the name of the following compound?
CH3
|
CH–CH2–CH3
|
|
CH3–CH2–CH–CH3
A. 3,4-dimethylhexene
B. 3-butylbutane
C. 3-methyl 4-ethylpentane
D. 3,5-octane
A. 3,4-dimethylhexene
Which of the following aromatic hydrocarbons is consist of two benzene rings?
A. toluene
B. naphthalene
C. anthracene
D. phenanthrene
B. naphthalene
Which of the following tests will distinguish 1-propanol from 2-propanol?
A. Fehling’s test
B. Tollen’s test
C. Benedict’s test
D. Lucas test
D. Lucas test
A carboxylic acid which contributes to the strong odor of rancid butter and other fats.
A. caproic acid
B. acetic acid
C. lactic acid
D. butyric acid
D. butyric acid
Which of the following is an acid found in milk?
A. lactic acid
B. tartaric acid
C. malic acid
D. citric acid
A. lactic acid
Ascorbic acid is
A. vitamin C
B. vitamin D
C. tocopherol
D. vitamin E
A. vitamin C
Retinal, retinol, and retinoic acid are stable form of
A. vitamin A
B. vitamin C
C. vitamin B
D. vitamin D
A. vitamin A