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NOVEMBER 2017 BOARD EXAM SAMPLE QUESTIONS: Day 1 Physical and Chemical Principles - 30% No of Items: 100 1. What is the pH of 0.21 M of sodium benzoate? Di given ang Ka or Kb. :) 2. What is the molecular weight of sucrose? 3. Who is the person behind carbon dating method? Answer: Libby 4. What is the vapor pressure of benzene at 22degC, melting point and boiling point? 5. Colligative properties: Mixture of benzene and naphthalene, given molality, find osmotic pressure and vapor pressure
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  NOVEMBER 2017 BOARD EXAM SAMPLE QUESTIONS: Day 1 Physical and Chemical Principles - 30% No of Items: 100 1. What is the pH of 0.21 M of sodium benzoate? Di given ang Ka or Kb. :) 2. What is the molecular weight of sucrose? 3. Who is the person behind carbon dating method? Answer: Libby 4. What is the vapor pressure of benzene at 22degC, melting point and boiling point? 5. Colligative properties: Mixture of benzene and naphthalene, given molality, find osmotic pressure and vapor pressure of solution. 6. Which do float or sink? balsa wood, ethylene glycol, table salt and ethanol 7. Which of the following decrease in entropy? Answer: melting of ice 8. Balancing equations (5 items) 9. What result from three alpha emissions and two beta emissions of Rn-222? 10. Naming of alkanes. 11. Definition of nucleophilic substitution. 12. Where is ozone layer found? 13. What is the solid part of the earth's crust? 14. Synthetic dye Choices: alizatrin, melanin, canotenoid 15. Definition of Henrys Law 16. Given initial temperature of copper metal = 258 degC, nilagay sa 250g water with initial temperature of 25degC. Final temperature of the mixture is 250degC. What is the weight of copper? 17. What is Nojul Mull process? 18. What is the sign convention of enthalpy during endothermic reaction? 19. Given: 100 MW of yellow light bulb, wavelength of 500nm. Calculate the number of photon emiited, frequency and energy.  20. A tank of O2 gas given P, V, T and another tank of N2 gas given P, V, T are mixed together, what is the final pressure of the gas mixture? 21. Given one mole of monoatomic gas, initial pressure and volume, and final pressure and volume, what is the change in entropy? 22. Definition of Heisenberg Uncertainty Principle. 23. What is the polymer used for printing and coating? 24. Semirara coal has 3.2% sulfur content -> fired. How much SO2 is produced, given material balance that Scoal = Sash + S product? 25. Another name of Taurine. 26. Given pH of dolomite=6.6, if pH becomes 5.6, what is the concentration of Calcium and Magnesium? 27. Internal energy is composed of all energy in the system except: a. free energy b. kinetic and potential energy c. heat of fusion d. enthalpy 28. A city in Laguna generates 0.96 kg per capita per day of Municipal Solid Waste (MSW). Makati City in Metro Manila generates 1.9 kg per capita per day of MSW. If both cities have population of 20000 inhabitants, determine the following - amount of MSW generated in each city - number of trucks needed to collect the MSW twice weekly, if each truck has a capacity of 4.4 tons and operates 5 days per week. Two loads per day at 75% capacity is the travel quota per day -the number and volume of MSW in tons that enter the landfill NOVEMBER 2016 BOARD EXAM SAMPLE QUESTIONS:  Day 2 Chemical Engineering Principles - 40% Concepts: 37 items Problem-Solving: 21 Problems (63 items) (Linked Problems - 3 questions each) 1. ChE Calculations (Sakto sakto sa sinagutan namin nung review) Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process. Reaction: H2O + SO3 --> H2SO4 (a) Calculate the amount of 95.9% H2SO4 used in tons/day (choices are in lbs) (b) Calculate the 97.3% H2SO4 used in tons/day (choices are in lbs) (c) Amount of 98% H2SO4 produced in ton/day (choices are in lbs) 2. ChE Calculations Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate. (a) What is the amount of sulfur in the feed if 980 kg of bisulfate was produced? (b) How much caustic soda was used? (c) How much SO2 was produced? 3. ChE Thermodynamics Water at 45degC and 10 kPa enters an adiabatic pump and is discharged at a pressure of 8600 kPa. Assume the pump efficiency to be 0.75. Data: V=1010 cm3/g, Volume Expansivity (beta) = 425 x10-6 /K and Cp=4.178 kJ/kg-K Calculate the following: (a) work of the pump Answer: 11.57 kJ/kg (b) the temperature change of the water  Answer: 0.97 degC (c) the entropy change of the water Answer: 0.009 kJ/kg-K 4. Agitation and Mixing (pinost ko na to dati, lumabas uli) Tests on a small scale tank 0.3 m diameter (Rushton impeller, diameter 0.1 m) have shown that a blending process between two miscible liquids (aqueous solutions, properties approximately the same as water, i.e. viscosity 1 mN s/m2, density 1000 kg/m3) is satisfactorily completed after 1 minute using an impeller speed of 250 rev/min. It is decided to scale up the process to a tank of 2.5 m diameter using the criterion of constant tip-speed. (a) What speed should be chosen for the larger impeller? Answer: 20.8 rev/min (b) What power will be required? Answer: 9.8 W (c) What will be the blend time in the large tank? Answer: 1.15 min 5. Flow of Fluids (Branching) 1.4 m3/s flowrate from a tank is to be delivered to another tank. Using parallel flow, d1=0.6m and d2=0.4m. Use f=1/(1/4 x Re). (a) What is the velocity at d1? (b) What is the velocity at d2? (c) What is the diameter if one pipe is used? 6. Membrane Separation A hollow fiber permeator with Do=300 micrometers and Di=200 micrometers gives a water flux of 10 gal/day-ft3 with 0.1M NaCl solution at 20degC and the salt rejection is 97%. Feed solution flows normal to the fibers at an average superficial velocity of 0.5 cm/s. (a) What is the polarization of the concentration? 7. Humidification Air at 75degC, 1.1 bar with 30% humidity is fed into a process unit at 1000 m3/hr. Calculate: (a) kmol O2 /hr

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