Day 1 - ARC Inorganic, Organic, Nuclear Chemistry Flashcards
For each of the following compounds, determine the weight percentage of the indicated element of the following compounds:
i. copper in cupric oleate
ii beryllium in emerald
iii. iron in prussian blue
iv. sulfur in lapis lazuli
a. 71.32%, 1.95%, 36.67%, 7.88%
b. 3.34%, 6.15%, 19.22%, 55.48%
c. 11.45%, 8.99%, 45.51%, 21.95%
d. 21.94%, 4.48%, 9.63%, 35.84%
C
Radon-222 a radioactive nuclide tends to undergo decay in order to become stable. If it undergoes two successive alpha emissions, followed by two successive beta emissions and one final alpha emission, what would be the stable nucleus formed?
a. 192Ir77
b. 210Pb82
c. 137Cs55
d. 179Hf72
B
One mole of A at one bar and one mole of B at two bar are separated by partition and surrounded by a heat reservoir. Determine the change in entropy when the partition is withdrawn?
a. 12.5 J/mol.K
b. 14.67 J/mol.K
c. 18.41 J/mol.K
d. 16.33 J/mol.K
A
In the study of fats and lipids, determine which of the following two triglycerides has a higher melting point?
Substance A - Lauric Acid and Glycerol
Substance B - Stearic Acid and Glycerol
a. Substance A
b. Substance B
c. Their melting points are equal
d. Insufficient Information
B
What is the organic molecular formual of lindane, a chlorinated pesticide which has been banned. It is composed of 24.781% carbon, 2.082% hydrogen, 73.142% chlorine and has a molecular mass of 290.834?
a. C3H6Cl9
b. C6H12Cl6
c. (CHCl)6
d. C9H6Cl12
C
Sherwood Roland and Mario Molina’s work on stratospheric ozone depletion garnered them the 1995 Nobel Prize in Chemistry. Which among the following species did they determine act as a catalyst for the decomposition of ozone?
a. Refrigerants
b. CClF3
c. Nitrogen Oxides
d. Chlorine Atoms
D
For a biochemical study involving the tigers at Malabon Zoo, a fatty acid was labeled with carbon-14. The sample was then fed to the tigers and after a few hours the tigers breath was analyzed. In which among the following compounds would you expect for the radioactive material to be detected?
a. as Nitrogen
b. As Carbon Dioxide
c. As Hydrogen
d. As water vapor
B
As part of your inheritance, an antique wristwatch was bestowed upon you. After keeping it for one year and 6 months, you were informed that the dials were painted using pigments containing radioactive radium. Analysis showed that the dials had an activity of 0.5 counts per second of beta particles. If 1 microcurie exhibits a dosage of 1000 mrem per year, what would be your accumulative equivalent dose during your exposure when you were unaware of its radioactivity?
a. 0.0135 mrem
b. 0.0203 mrem
c. 0.0305 mrem
d. 0.0458 mrem
B
Classify the following biochemical compounds whether they are hydrophilic, hydrophobic, or amphipathic: Fatty Acid, Glycerol, Soap, or Stearic Acid
a. hydrophilic, hydrophobic, hydrophilic, hydrophobic
b. hydrophobic, hydrophobic, amphipathic, hydrophobic
c. ampiphatic, hydrophilic, hydrophobic, amphipathic
d. hydrophobic, hydrophilic, amphipathic, hydrophobic
D
A manufacturing plant in Laguna that produces boron-based additives is sourcing minerals to use as raw materials for their process. Their standard run utilizes kernite as the source material. Due to the shortage of the aforementioned mineral, the purchasing department sourced borax instead. How much additional borax in kg must be processed in order to maintain the 1 MT Boron produced in a standard run of Kernite?
a. 283 kg
b. 717 kg
c. 2495 kg
d. 6320 kg
C
What are the two most common components of acid rain?
a, Phosphoric acid and Carbonic Acid
b. Sulfuric Acid and Nitric Acid
c. Oxalic Acid and Sulfuric Acid
d. NItric Acid and Phosphoric Acid
B
A BMW is travelling along the North Luzon Expressway towards Tarlac. If the fuel tank contains high octane gasoline, density equal to 0.71 g/ml, how much carbon dioxide was emitted by the vehicle if its gas mileage is 19.75 miles/gal for a distance o 125 miles?
a. 52 kg CO2
b. 66 kg CO2
c. 78 kg CO2
d. 93 kg CO2
A
Match the following radioactive isotope with its corresponding application:
(a) Cobalt-60
(b) Thallium-201
(c) Tritium
(d) Mercury-197
1- Heart Scan in Exercise
2- Measure water content of body
3-Kidney Scan
4- Cancer Therapy
a. a-2, b-3, c-4, d-1
b. a-3, b-1, c-4, d-2
c. a-4, b-1, c-2, d-3
d. a-2, b-4, c-3, d-1
C
Determine the percent atom economy of the Raschig Process.
a. 17.3%
b. 22.4%
c. 34.7%
d. 46.5%
A
Which among the following radioactive nuclide is often bombarded with the various isotopes of lead in order to produce most of the new superheavy elements?
a. Iodine-131 and Lawrencium-257
b. Chromium-51 and Gallium-67
c. Calcium-48 and Nickel-64
d. Selenium-75 and Krypton-81m
C
A person’s sense of smell and taste depends on specific biochemical receptors present in a person’s nose and mouth. In 2004, a Nobel prize was given to the researchers who established this fact and identiied that the type organic compound associated with the sense of smell and taste. The chemical identified was
a. Rhodopsin
b. Retinal
c. Retinol
d. Riboflavin
A
A Chemical Engineer joined Pilipinas Got Talent as a magician that can perform marvelous feats. For the finals, he claims that he can make the audience instantaneously smile or cry by simply waving his hand. To execute his trick, if he releases laughing gas from the front and tear gas at the rear of a 201 row hall, which row will inevitably smile and cry at the same time?
a. 67th row
b. 93rd row
c. 108th row
d. 134th row
D
A hypothetical gas has a density of 1.2504 g/L at STP. Calculate the following in terms of cm/s:
Modal Speed:
a. 4.51x10^4 cm/s
b. 4.33x10^4 cm/s
c. 4.00x10^4 cm/s
d. 4.9x10^4 cm/s
C
Average speed:
a. 4.51x10^4 cm/s
b. 4.33x10^4 cm/s
c. 4.00x10^4 cm/s
d. 4.9x10^4 cm/s
A
Root-mean-square speed:
a. 4.51x10^4 cm/s
b. 4.33x10^4 cm/s
c. 4.00x10^4 cm/s
d. 4.9x10^4 cm/s
D
Determine the uncertainty in position of a proton that moves at 1/10 the velocity of light. Assume the velocity is measured with 1% precision.
a. 4.67 m
b. 1x10-13 m
c. 0.001528 m
d. 3x10^7 m
B
What is the color of the light of a 75-watt light source that was able to emit 9.91x10^20 photons of a monochromatic radiation for 5.0s?
a. Red
b. Yellow
c. Blue
d. Green
D
Halogens have tendency to form compounds with one another called interhalogens. Which among the following molecules has the lowest boiling point?
a. Bromine Chloride
b. Iodine Bromide
c. Chlorine Fluoride
d. Bromine Fluoride
C
What is the molecular weight of a sample of cellulose acetate if its 0.2% (w/v) solution in acetone (sp. gr = 0.8) shows an osmotic rise of 23.1 mm against pure acetone at 27 deg C?
a. 19900 g/mol
b. 27500 g/mol
c. 32600 g/mol
d. 44800 g/mol
B
Twenty-five bone samples from Mindoro is believed to have come from a new species of prehistoric humanoids. The activity of carbon in a femur sample was measured to be at 0.0019 disintegrations of C-14 per minute per gram of C-12. What is the possible age range of the retrieved prehistoric humanoid?
a. Between 65000 to 70000 years old
b. Between 70000 to 75000 years old
c. Between 75000 to 80000 years old
d. Between 80000 to 85000 years old
B
Two beakers containing sulfuric acid and phosphoric acid separately was neutralized by the same base. If equal amounts of the alkali was used for the neutralization reaction and it produced sulfate ions and dihydrogen phosphate ions, what is the mass ratio of sulfuric acid to phosphoric acid that was originally present in the beakers?
a. 1/2
b. 3/7
c. 5/4
d. 6/11
A
Consider the following sequence of reacions:
i) a silver nitrate solution was mixed with 0.13 g of copper where 0.433 g of silver is produced.
ii) 0.47 g Cu was produced by mixing 0.13 g of aluminum with a copper sulfate solution
iii) 0.13 g of hydrogen from an acid was produced after mixing the latter with 1.17 g of aluminum.
Equivalent weight of silver
a. 5.45 g
b. 9.01 g
c. 32.5 g
d. 108.4 g
D
Equivalent weight of copper
a. 5.45 g
b. 9.01 g
c. 32.5 g
d. 108.4 g
C
Equivalent weight of aluminum
a. 5.45 g
b. 9.01 g
c. 32.5 g
d. 108.4 g
B
What is the concentration in g/L of a 12 cc solution of sulfuric acid that can be neutralized with 15 cc of 1/10 N sodium hydroxide solution?
a. 4.72 g/L
b. 6.13 g/L
c. 9.45 g/L
d. 13.81 g/L
B
When steam condenses into water at 90degC, the entropy of the system decreases. What must be true if the second law of thermodynamics is to be satisfied?
a. Entropy of universe also decreases
b. Entropy of surrounding increases to the same extent to which entropy of the system decreases
c. Entropy of surrounding also decreases
d. Entropy of the surrounding increases to a greater extent than the decrease in the entropy of the system.
D
In which of the following cases does entropy decreases
a. Polymerization of styrene and butyl acrylate
b. Dissolving Mohr’s salt in water
c. Expansion of high purity hydrogen gas
d. Melting silver ingots
A
Assuming a situation where a strong acid is mixed with a strong base, if each solution has a concentration of 1 N, which mixture will display the highest increase in temperature?
a. 25 ml acid and 25 ml base
b. 20 ml acid and 30 ml base
c. 10 ml acid and 40 ml base
d 35 ml acid and 15 ml base
A
When benzene and napthalene is mixed in a single container at room temperature, an ideal solution will be formed. Which among the following expressions does NOT describe the aforementioned process.
a. delta S_system is positive
b. delta H_system = 0
c. delta G > 0
d. delta S_surrounding is zero
C
Which among the following process occuring at 100 deg C and 1 atm:
H2O (l) -> H2O (g)
Which among the following statements is correct?
a. delta S_system > 0 & delta S_surrounding > 0
b. delta S_system < 0 & delta S_surrounding > 0
c. delta S_system < 0 & delta S_surrounding < 0
d. delta S_system > 0 & delta S_surrounding < 0
D
A 5 kg Thorium ore sample was shipped from Sweden to the Philippines in order to be studied by the experts in the Philippine Nuclear Research Institute. A chemical engineer was assigned to determine the age of the ore sample. If she was able to collect 7.32x10-4 ml of helium gas as STP and detect 500 nanograms of Thorium-232, what is the age of the ore sample. The half life of Thorium-232 is 1.39x10^10 years.
a. 3.34x10^8 years old
b. 2.51x10^10 years old
c. 1.95x10^12 years old
d. 7.38x10^14 years old
B
Which among the following organic molecules is properly named based on the IUPAC guidelines
a. 2-butyl-3-methyl-1-pentene
b. 3-ethyl-3-octen-5-ol
c. 4-tert-butyloctane
d. 2-methyl-2-isopropylheptane
C
A new radioisotope, represented has been isolated by scientists from CERN. A nuclear chemisty was given the responsibility of studying its decay. By performing tests, he observed that the half-life of the isotope is 5 days. If he had 0.1 moles of the radioisotope initially, how many atoms of it will decay on the fifteenth day in Curies?
a. 6.59 x10^5 Ci
b. 3.76x10^5 Ci
c. 2.87x10^5 Ci
d. 7.11x10^5 Ci
B
Researchers from University of Santo Domingo were able to create two new compounds from two hypothetical elements A and B. The compound properties were measured as follows
i) 64.5 grams of compound A2B3 were mixed with 135.18 grams of benzene. It was then cooled until the solution froze at 0.734 deg Celsius
ii) A solution comprised of 95.287 grams of AB4 in 41.77 grams of ethanol boiled at 83.60 deg Celsius.
What is the molecular weight of A2B3?
a. 398 g/mol
b. 507 g/mol
c. 612 g/mol
d. 791 g/mol
B
What is the molecular weight of AB4?
a. 172 g/mol
b. 933 g/mol
c. 545 g/mol
d. 467 g/mol
D
A Chemical Engineering student was tasked with preparing two solutions for an experiment. For one of the solutions, the student dissolved a nonvolatile, non-electrolyte in 5 ml of water and diluted it to the mark of a 25 ml volumetric flask producing 0.05 M solution. For the other solution, the student simply dissolved a finite amount of sodium chloride in 150 ml volumetric flask, initially containing 60 ml of deionized water, before diluting it to the mark, producing a 0.03 M aqueous solution. The student then took 20 ml aliquots of each solution and placed them beside one another inside a glass cover. Assuming the solutions reached equilibrium:
What is the volume of non-electrolyte solution aliquot?
a. 23.14 ml
b. 20.77 ml
c. 18.18 ml
d. 15.64 ml
C
What is the volume of the sodium chloride solution aliquot?
a. 24.36 ml
b. 19.23 ml
c. 16.86 ml
d. 21.82 ml
D
For each of the following, determine the main physiological active substance obtain derived from them:
i) pituituary gland
ii) sap of opium seeds
iii) belladona plant
iv) bark of a willow tree
a. opium, beta endorphin, salicin, atropine
b. atropine, salicin, opium, beta endorphin
c. salicin, atropine, beta-endorphin, opium
d. beta-endorphin, opium, atropine, salicin
D
A sculptor was hired by a firm in BGC to create an ice sculpture of their logo within two days for their 50th anniversary. Given the time constraint, the sculptor needs to solven the ice in certain spots immediately. Which among the following salts should the sculptor use for this task to efficiently make use of his time?
a. KCl
b. MgSO4
c. CaCl2
d. AgCl
C
Consider : Cerargyrite
I = Is it soluble in H2O?
II = Is it soluble in Hexane?
III = Is it tricllinic
IV - Is it vapor at 1600 deg C?
a. No, Yes, Yes, Yes
b. Yes, Yes, No, No
c. No, No, No, Yes
d. Yes, No, Yes, No
C
Menthol is used to flavor a variety of food products. Its most stable configuration is 2-isopropyl-5-methylcyclohexanol where the hydroxyl functional group is in the equatorial position. Which among the following does not describe this configuration?
a. The isopropyl group is attached on the equatorial position and is trans to the hydroxyl functional group
b. The methyl group is attached on the axial position and is trans to the hydroxyl group
c. The methyl group is attached to the equatorial position and is trans to the isopropyl group
d. The isopropyl group is attached to the equatorial positoin and is trans to the methyl group
B
When 2,3-dimethyl-2-butanol is treated with phosphoric acid at 120 deg Celcius, which among the following is the major product?
a. 2,3-dimethyl-1-butene
b. 2,3-dimethyl-2-butene
c. 2,4-dimetyl-2-butene
d. 2,3-dimethyl-1-butene
B
For a batch of compromised plutionium fuel rods that are being disposed off, an 85 kg worker accidentally inhaled 100 microgram of Plutonium-239 (half-life = 2.41x10^4 year). If each disintegration produces 5.15 MeV and 16 hours has passed from the time of inhalation:
What is the equivalent dose?
a. 1.84x10-3 Sv
b. 4.27x10-6 Sv
c. 3.66x10-4 Sv
d. 8.64x10-6 Sv
D
What is the absorbed dose? Q=6.75
a. 6.32x10-7 Gy
b. 1.28x10-6 Gy
c. 5.42x10-5 Gy
d. 2.73x10-4 Gy
C
A nuclear engineer is recalibrating a Geiger counter for detecting the neutrons within the immediate vicinity of used control rods. If the measured activity is at 28 mCi, five meters away from the control rods, what would be the expected activity for an additional 30 meters away from it?
a. 0.57 mCi
b. 0.78 mCi
c. 0.43 mCi
d. 0.96 mCi
A
