Sample/practice exam 2020, questions and answers PDF

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CHEMICAL ENGINEERING PRE-BOARD EXAMINATION NOVEMBER 2019Day 1: Physical and Chemical Principles Auxesis Review Center Republic of the PhilippinesSET AINSTRUCTORS:a) Choose the best answer to each question by shading the circle corresponding to the letter of the correct answer. b) Use number 2 pencil...

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CHEMICAL ENGINEERING PRE-BOARD EXAMINATION NOVEMBER 2019 Day 1: Physical and Chemical Principles Auxesis Review Center Republic of the Philippines SET A INSTRUCTORS: a) Choose the best answer to each question by shading the circle corresponding to the letter of the correct answer. b) Use number 2 pencil for shading the answers. DO NOT USE ballpoint pen. c) Only PERRY’S CHEMICAL ENGINEERS’HANDBOOK (any edition) and the PERIODIC TABLE OF ELEMENTS are allowed for open reference during the examination. d) CASIO fx-991ES PLUS and all other programmable calculators are NOT ALLOWED. Only one (1) calculator is allowed during the examination. e) Cellphones or any similar devices are STRICTLY PROHIBITED at any time during the examination. f) Any reference mentioned in(c)with any kind of side notes written on or inserted to it as found by the watcher before and during the examination shall be immediately CONFISCATED. g) Failure to conform to (e) and (f) shall automatically result to DISQUALIFICATION of the examinee to continue with the examination. ----------------------------------------------------------------------------1.

In 1986, the nuclear reactor in Chernobyl had an accident and spewed radioactive nuclei that were carried by the winds for hundreds of miles. Today, among the child survivors of the event, the most common damage is thyroid cancer. Which radioactive nucleus do you expect to be responsible for these cancers? a. I-131 c. I-123 b. I-129 d. I-125

2.

Which of the following objects are chiral? a. pair of scissors b. beaker c. paper clip d. the swirl created in water as it drains out of a sink or bathtub

3.

Perchloroethylene, which is a liquid at room temperature, is one of the most widely used solvents for commercial dry cleaning. It is sold for this purpose under several trade names, including Perclene. Does this molecule have polar bonds? Is it a polar molecule? Does it have a dipole? a. yes, non-polar, yes c. no, non-polar, none b. no, non-polar, yes d. yes, non-polar, none

4.

You place manganese, calcium chloride and sodium acetate in a liquid, in which they are not soluble. The liquid has a density of 2.15 g/ml. Which will sink to the bottom, which will stay on the top, and which will stay in the middle of the liquid? a. manganese, sodium acetate, calcium chloride b. calcium chloride, manganese, sodium acetate c. calcium chloride, sodium acetate, manganese d. manganese, calcium chloride, sodium acetate

5.

In of a. b.

photosynthesis, how many grams of CO 2 are required to produce 5.1 g glucose? 8.8 kg c. 6.3 kg 7.5 kg d. 9.6 kg

6.

Classify these as kinetic or potential energy (1) Water held by a dam (2) A speeding train (3) A book on its edge before falling (4) A falling book (5) Electric current in a light bulb a. kinetic, kinetic, potential, kinetic, kinetic b. kinetic, kinetic, potential, kinetic, potential c. potential, kinetic, potential, kinetic, potential d. potential, kinetic, potential, kinetic, kinetic

7.

We heat 50.0 g of an unknown substance by adding 205 cal, and its temperature rises by 7.0°C. Identify the substance. a. water c. benzene b. ethanol d. acetic acid

8.

What process combines rubber and sulfur at a high temperature? a. fulmination c. fermentation b. vulcanization d. distillation

9.

Who invented the Carbon-14 dating method? a. Irving Langmuir c. August Hofmann b. Williard Libby d. Otto Hahn

10. Which of the following formula is red lead? a. PbO c. Pb2O4 b. Pb4O6 d. Pb3O4 11. Suppose that the yield of aspirin by the reaction is 75%. How many grams of salicylic acid would be required to give an actual yield of 25.0 g of aspirin? c. 26 g a. 43 g b. 12 g d. 35 g 12. Predict which of these ionic compounds are soluble in water: (1) MgCl2 (4) NH4NO3 (2) CaCO3 (5) Pb(OH)2 (3) Na2SO3 a. soluble, soluble, soluble, soluble, soluble b. soluble, insoluble, soluble, soluble, insoluble c. soluble, insoluble, insoluble, soluble, insoluble d. soluble, insoluble, insoluble, soluble, insoluble 13. Polymer used in bullet proof vest a. linear polyethylene b. polyacrylonitrile

c. polycarbonate d. polymethyl acrylate

For numbers 14 to 15: A series of measurements of BOD for a sample of river water over several days are tabulated below. Day BOD (mg/L) 2 70.0 5 102.4 7 111.0 8 114.0 10 118.8 14. Determine the BOD rate constant (in base e). a. 0.42/day c. 0.51/day b. 0.36/day d. 0.23/day 15. Determine the ultimate BOD.

a. 130 mg/L c. 170 mg/L b. 140 mg/L d. 190 mg/L 16. A voltaic cell is represented by the following equation: Fe(s) + Zn2+(aq)  Fe2+(aq) + Zn(s) Which electrode is the anode and which electrode is the cathode? a. Fe, Zn c. Fe, Fe b. Zn, Fe d. Zn, Zn 17. The only natural amino acid that has no chiral center is: a. Cysteine b. Tryptophan b. Proline d. Glycine 18. The heat of combustion of methane, the major component of natural gas, is 213 kcal/mol. The heat of combustion of propane, the major component of LPG or bottled gas, is 530 kcal/mol. On a kcal/mol basis, which of these two fuels is the better source of heat energy? On a kcal/g basis, which of these two fuels is the better source of heat energy? a. propane, propane c. propane, methane b. methane, propane d. methane, methane 19. If 3.3 g of a gas at 40°C and 1.15 atm pressure occupies a volume of 1.0 L, what is the mass of one mole of the gas? a. 74 c. 89 b. 65 d. 52 20. Calculate the entropy change if 350 g of water at 5 0C is mixed with 500 g of water at 700C. a. 3.33 eu c. 5.05 eu b. 6.67 eu d. 4.49 eu 21. How to differentiate alkane alkene and alkyne? a. combustion on an empty beaker b. nature of carbon and its branching c. reaction with Br2 d. all of these 22. Process of breaking down a large isotope into smaller isotopes. a. nuclear fission c. nuclear fusion b. beta particle emission d. gamma ray emission 23. Can a hydrogen bond form between (1) Two molecules of methanol, CH3OH? (2) Two molecules of formaldehyde, CH2O? (3) One molecule of methanol, CH3OH, and one of formaldehyde, CH2O? a. yes, yes, yes c. no, yes, no b. yes, no, yes d. yes, no, no 24. What will happen to ice at 0°C if the pressure decreases from 1 atm to 0.001 atm? a. it becomes vapor c. it becomes liquid b. it remains solid d. both a and c are possible 25. How does alpha, beta and gamma particle affect the mass number of an atom? a. 4, 1, 0 c. 4, 0, 0 b. 4,-1, 0 d. 2,-1, 0 26. Notation on alkane containing Cl a. chloro b. chloride

c. chlorate d. chloric

27. In an autoclave, a constant amount of steam is generated at a constant volume. Under 1.00 atm pressure, the steam temperature is 100°C. What pressure setting should be used to obtain a 165°C steam temperature for the sterilization of surgical instruments? c. 1.8 atm a. 2.3 atm b. 1.2 atm d. 2.6 atm 28. What was Melvin Calvin was known for his study of? a. x-rays c. magnetics b. photosynthesis d. boiling point 29. Using the equilibrium constants given for reactions (1) and (2), what is the equilibrium constant for reaction (3)? (1) 2NO(g) + O2(g) → N2O4(g) Kp = 1.49 × 1013 (2) 2NO(g) + O2(g)→ 2NO2(g) Kp = 1.66 × 1012 (3) N2O4(g) → 2NO2(g) a. 0.0123 c. 0.111 b. 8.98 d. 80.3 30. Which of the of soap? a. A soap is b. A soap is c. A soap is d. A soap is

following is the best definition of the chemical nature a very long molecule. a long chain carboxylic acid. an ester of glycerol and a long chain carboxylic acid. a salt of a long chain carboxylic acid.

31. Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described? a. deposition c. fusion b. condensation d. sublimation 32. Balancing C2H5SH + O2 → CO2 + H20 + SO a. 1, 8, 4, 5, 1 c. 2, 7, 4, 4, 2 b. 2, 9, 4, 6, 2 d. 1, 5, 4,3, 1 33. Given: Dodecane (1) Is it soluble in water? (2) Is it soluble in hexane? (3) Is it combustible? (4) Is it solid, liquid or gas at room temperature and atmospheric conditions? (5) Is it denser than water? a. no, yes, yes, liquid, less dense b. no, yes, yes, gas, denser c. no, yes, no, liquid, less dense d. no, no, yes, gas, dense 34. Which of the following has a larger ionic nucleus? Na+ or Na? a. Both c. Na+ b. Na d. none of these 35. The purpose of control rods in a fission reactor is to: a. cool down the reactor fuel. b. prevent oxygen from reaching the fuel. c. absorb neutrons generated in the fission process. d. absorb electrons emitted in the fission process. 36. What compound is a ketone but it is not a carbohydrate but is useful commercially? a. ethyl alcohol c. glucose b. aldehyde d. acetone 37. Which bond is the least polar? C-C, C-N, C-Cl, C-F, C-O? a. C-C < C-Cl < C-N < C-O < C-F c. C-F < C-N < C-C < C-Cl < C-O

b. C-Cl < C-N < C-C < C-F < C-O

d. C-O < C-N < C-F < C-C < C-Cl

38. Which Republic Act is the PRC Modernization Act of 2000? a. R.A. 8750 c. R.A. 8890 b. R.A. 7897 d. R.A. 8981 39. You are presented with a Lewis dot structure of element X as X. To which two groups in the Periodic Table might this element belong? a. Group 2 A c. Group 1 A b. Group 7 A d. Group 4 A 40. The molar volume of benzene (l) is 88.9 cc at 20°C and 1 atm pressure. Find the value of ΔG for the compression of 1 mole of the liquid from 1 to 100 atm. a. 254 calories c. 222 calories b. 287 calories d. 213 calories 41. A radioactive isotope with an intensity (activity) of 100 mCi per vial is delivered to a hospital. The vial contains 10 mL of liquid. The instruction is to administer 2.5 mCi intravenously. How many milliliters of the liquid should be administered? a. 0.66 ml c. 0.40 ml b. 0.18 ml d. 0.25 ml 42. Diving, particularly SCUBA (Self-Contained Underwater Breathing Apparatus) diving, subjects the body to increased pressure. Each 10 m (approximately 33 ft) of water exerts an additional pressure of 1 atm on the body. What is the partial pressure of oxygen in the air in the lungs at a depth of 100 ft? a. 0.83 atm c. 3.1 atm b. 4.0 atm d. 0.77 atm 43. The solubility of aspartic acid in water is 0.500 g in 100 mL at 25°C. If we dissolve 0.251 g of aspartic acid in 50.0 mL of water at 50°C and let the solution cool to 25°C without stirring, shaking, or otherwise disturbing the solution, would the resulting solution be a saturated, unsaturated, or supersaturated solution? c. supersaturated a. saturated b. unsaturated d. cannot be determined 44. A certain liquid has a viscosity of 0.0001 poise and a density of 3.2 g/ml. How long will it take for platinum ball with 2.5 mm radius to fall 1 cm through the liquid? The density of the platinum is 21.4 g/ml. a. 33.4 s c. 28.4 s b. 40.5 s d. 48.9 s 45. The heat of vaporization of liquid Freon-12, CCl 2F2, is 4.71 kcal/mol. Calculate the energy required to vaporize 39.2 g of this compound. The molecular weight of Freon-12 is 120.9 amu. a. 1.53 kcal c. 1.98 kcal b. 1.12 kcal d. 1.67 kcal 46. Microwaves are a form of electromagnetic radiation that is used for the rapid heating of foods. What is the frequency of a microwave with a wavelength of 5.8 cm? c. 5.2x109 /s a. 3.6x109 /s 9 b. 9.4x10 /s d. 1.7x109 /s 47. Water on heating from 1 to 4°C a. contracts b. has same volume 48. This law explains incinerate”.

why

aerosol

c. expands d. may contract or expand cans

carry

the

warning

“Do

not

a. Charles Law b. Gay-Lussac Law

c. Boyles Law d. Daltons Law of Partial Pressure

49. A teardrop with a volume of 0.5 mL contains 5.0 mg salt. What is the molarity of the salt in the teardrop? a. 0.4 M c. 0.1 M b. 0.3 M d. 0.2 M 50. How much work is done when a man weighing 75 kg climbs the Washington monument, 555 ft high? How many kilocalories must be supplied to do this muscular work, assuming that 25% of the energy produced by the oxidation of food in the body can be converted into muscular work? a. 254 kcal c. 119 kcal b. 380 kcal d. 476 kcal 51. The normal boiling point of a substance depends on both the mass of the molecule and the attractive forces between molecules. Arrange the compounds in each set in order of increasing boiling point: (1) HCl, (2) HBr and (3) HI. a. HI < HBr < HCl c. HCl < HBr < HI b. HCl < HI < HBr d. HI < HCl < HBr 52. Trichlorofluoromethane (Freon-11, CCl3F) as a spray is used to temporarily numb the skin around minor scrapes and bruises. It accomplishes this by reducing the temperature of the treated area, thereby numbing the nerve endings that perceive pain. Calculate the heat in kilocalories that can be removed from the skin by 1.00 mL of Freon-11. The density of Freon-11 is 1.49 g/mL, and its heat of vaporization is 6.42 kcal/mol. a. 7x10-2 kcal c. 5x10-2 kcal -2 b. 1x10 kcal d. 3x10-2 kcal 53. Which isotope boron-12? a. boron-8 b. boron-10

of

boron

is

the most

stable:

boron-8,

boron-10,

or

c. boron-12 d. both a and b

54. Balloons now are used to move huge trees from their cutting place on mountain slopes to conventional transportation. Calculate the volume of a balloon needed if it is desired to have a lifting force of 1000 kg when the temperature is 290 K at 0.940 atm. The balloon is to be filled with helium. Assume that air is 80 mol % N 2 and 20 mol % O2. Ignore the mass of the superstructure and propulsion engines of the balloon. a. 1020 m3 c. 1530 m3 3 b. 1480 m d. 1660 m3 55. Suppose that on another planet where the atmosphere is ammonia that the pressure on the surface, at h = 0, is 400 Torr at 250 K. Calculate the pressure of ammonia at a height of 8000 m. The planet has the same g value as the earth. a. 100 Torr c. 210 Torr b. 130 Torr d. 220 Torr 56. According to the label on a piece of cheese, one serving of 28 g provides the following daily values: 2% of Fe, 6% of Ca, and 6% of vitamin A. The recommended daily allowances (RDA) of each of these nutrients are as follows: 15 mg Fe, 1200 mg Ca, and 0.800 mg vitamin. Calculate the concentrations of each of these nutrients in the cheese in ppm. a. 5 ppm c. 15 ppm b. 10 ppm d. 20 ppm 57. What is the specific gas constant of dry air in J/kg per unit Kelvin?...