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COACHING- ARC > DAY 1- PCP PROBLEM SOLVING > Flashcards

DAY 1- PCP PROBLEM SOLVING Flashcards

1
Q

Determine the number of grams of C2H5N that will heat with 81.81 g of oxygen in the equation:

C2H5N + O2 -> CO + H2O +NO

A

40 g

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2
Q

Determine the volume in mL of 1 mol of pure ethyl alcohol.

A

58 mL

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3
Q

The distance of the Earth to the most remote normal galaxy is calculated to be:

A

2x10^22 m

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4
Q

Balance the following chemical equation:

_Al + _NH4ClO4 -> _Al2O3 + _AlCl3 + _NO + _H2O

A

3, 3, 1, 1, 3, 6

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5
Q

If the high octane gasoline with density 0.71 is used by a BMW on NLEX to travel to Tarlac 125 mi away and a gas mileage of 19.75 mi/gal estimate the quantity in kg of carbon dioxide produced.

A

52 kg

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6
Q

The following reactions are important in lake and river sediments that are devoid of oxygen

SO4 (2-) + H (+) + CH2O -> HS (-) + CO2 + H2O

Balance this equation.

A

1, 1, 2, 1, 2, 2

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7
Q

Determine the organic molecular formula of melamine used in the process of manufacturing formica. It is composed of 28.57% carbon, 4.82% hydrogen, and 66.634% nitrogen, and has a molecular mass of 126.122.

A

(CH2N2)3

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8
Q

When formic acid is 4.6% ionized in 0.105M of aqueous solution at room temperature, determine the ionization constant of the acid. If the solution containing 0.25N of 25mL acid is diluted to 202 mL and tirated with 0.35 NaOH, calculate the pH value and the concentration of the hydrogen ion at the equivolume part.

A

2.2x10^-4 ; 8.06 ; 8.7×10^-9

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9
Q

Calculate the heat of vaporization in kJ/mol of the compound with the following characteristics.

T(K)- 338.12, 369.52
P(torr)- 52.301, 141.801

A

33.06 kJ/mol

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10
Q

If one gallon of blood was added to three gallons of water, and one ounce of that dilution was added to 9 ounces of water, what is the final dilution when 7mL of that dilution was added to 563 mL of water?

A

3.11x10^-4

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11
Q

Analyze and determine the mass weight in milligrams of a 2.01 mg sample of an isotope. 83-Bi has a half-life of 1.03 yrs that has not decayed after 3.77x10^3 hrs.

A

1.5mg

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12
Q

Analyze and calculate the percentage of nickel in a 1.201 g sample of nickel ore which was analyzed by the volumetric method. A solution of 48 mL containing 1.4x10^-2 g of KCN/mL and the excess cyanide required half a milliliter of silver nitrate solution with 1.25x10^-2 g AgNO3 per milliliter.

A

12.5%

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13
Q

Determine the volume of carbon dioxide in cubic feet occupied by 120 lbs at a pressure of 1.5 atm.

A

750

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14
Q

Determine the number of days it will take for one milligram of rubidium to decay to 0.6 mg

A

63

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15
Q

How many moles of beryllium would a 43.1 lb sample of pure aquamarine with formula Be3Al2(SiO3)6 contain?

A

1.1x10^2 mol

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16
Q

Determine the empirical formula of an ionic compound used as a food preservative and containes 24.21% sodium, 33.7% sulfur, and 42.1% oxygen.

A

Na2S2O5

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17
Q

If a person breathes 100 breathes per minute and is aged 75, how many breathes will she/he have during his lifespan?

A

3.942x10^9

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18
Q

In a gas mixture containing 100mg/L H2S gas at 25 deg C and 1 atm, determine the partial pressure exerted by the gas.

A

0.071

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19
Q

When liquid nitrogen was used to remove warts in human beings, what is the temperature in Kelvin if liquid nitrogen has a freezing point of -210 deg C?

A

63 K

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20
Q

Balance this equation which reported the chemical reaction occurring in the aeration of water for drinking purposes:

Fe(HCO3)2 + O2 + H2O -> Fe(OH)3 + CO2

A

4, 1, 2, 4, 8

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21
Q

As a result of the Aykhal Crystal Denotation in 1974 (in the former Soviet Union), Cesium-137 was measured (in 1993) in the soil concentration of 2x10^4 Bq/kg soil. If the background concentration of 137-Cs is 0.5 Bq/kg soil, how many years will it take before the concentration of 138-Cs reaches background levels? The decay of radionuclide occurs by a first-order reaction. Half-life is 30 years.

A

459 years

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22
Q

Calculate the mass of titanium in kilograms in 0.4011 million grams of TiCl4.

A

101

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23
Q

What is the empirical formula of a sample of cement found to contain 14.21 grams of molybdenum and 8.31 grams of silicon.

A

MoSi2

24
Q

Determine the final volume of 0.51 M KBr when the starter volume is 100 mL. From a 50 mL solution of 0.25 M alanine, what volume will be required using 0.11 alanine.

A

196, 114 mL

25
Q

A falling raindrop initially has no dissolved oxygen. The saturation concentration for oxygen in the drop of water is 9.20 mg · L−1. If, after falling for 2 s, the droplet has an oxygen concentration of 3.20 mg · L−1, how long must the droplet fall (from the start of the fall) to achieve a concentration of 8.20 mg · L−1? Assume that the rate of oxygen exchange is first-order.

A

10.4 s

26
Q

Glutamic acid is used as one of the reagents for a standard to check the BOD test. Determine the theoretical oxygen of 150 ppm of glutamic acid.

A

212 ppm

27
Q

A water contains 100.0 mg · L−1 CO2−3 and 75.0mg·L−1 HCO−3 atapHof10(T= 25◦C). Calculate the exact alkalinity. Approximate the alkalinity by ignoring the appropriate chemical species.

A

233 mg/L as CaCO3

28
Q

If the 3-day BOD of a waste is 75 mg/L and the BOD decay constant, k = 0.345/d, what is the ultimate BOD?

A

116 mg/L

29
Q

A waste is being discharged into a river that has a temperature of 100C. What fraction of the maximum oxygen consumption has occurred in 4 days if the BOD rate constant k, determined in the laboratory under standard conditions is 0.115/d?

A

0.12

30
Q

The BOD of a wastewater sample is estimated to be 180 mg/L. What volume of undiluted sample should be added to a 300- mL bottle? Assume that 4 mg /L BOD can be consumed in the BOD bottle.

A

7 mL

31
Q

What is the BOD5 of the wastewater sample if the DO values for the blank and diluted sample after 5 days are 8.7 and 4.2 mg/L, respectively?

A

205 mg/L

32
Q

Compute the theoretical NBOD of a wastewater containing 30 mg/L of ammonia as nitrogen. If the wastewater analysis was reported as 30 mg/L of ammonia (NH3), what would the theoretical NBOD be?

A

137 mg/L and 113 mg/L

33
Q

The town of Aveta discharges 17,360 m3/day of treated wastewater into the Tefnet Creek. The treated wastewater has a BOD5 of 12 mg/L and a BOD decay constant, k, of 0.12 day−1 at 20◦C. Tefnet Creek has a flow rate of 0.43 m3/s and an ultimate BOD, Lo, of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.0 mg/L. Compute the DO and initial ultimate BOD, Lo, after mixing.

A

4.75 mg/L and 12 mg/L

34
Q

Given the following data for Marikina River and Pasig River, determine the best combination of plant and location to conserve the environment.

kunwari may table basta sauluhin ang sagot XD

A

Plant B in Marikina River

35
Q

The following mineral analysis was reported for a water sample taken from well No. 1 at the Eastwood Manor Subdivision near McHenry Illinois (Woller and Sanderson, 1976a). Well No. 1, Lab No. 02694, November 9, 1971). (Note: All reported as mg/L as the ion unless stated otherwise.) Determine the total, carbonate and non-carbonate hardness (in mg/L as CaCO3) using the predominant polyvalent cation.

insert imaginary table

A

TH = 332.8, CH = 284.0 and NCH = 48.8

36
Q

The design flow and overflow rates for a settling tank are 0.044 m3 · s−1 and 20 m · day−1, respectively. Determine the surface area of this tank. Determine the length of the tank, using conventional wisdom for length- to-width ratios. Determine the tank depth, assuming a detention time of 2 hours.

A

190 m^2, 16 m and 1.7 m

37
Q

If a 1.0 m3 · s−1 flow water treatment plant uses ten sedimentation basins with an overflow rate of 15 m3 · day−1 · m−2, what should be the surface area (m2) of each tank?

A

576 m^2

38
Q

Given the following temperature and elevation data, determine the stability of the atmosphere.

Elevation (m)- 2.00, 324.00
Temperature (deg C)- 14.35, 11.13

A

-1 deg C, neutral

39
Q

A power plant in a college town is burning coal on a cold, clear winter morning at 8:00 A.M. with a wind speed of 2.6 m · s−1 measured at 30 m elevation and an inversion layer with its base at a height of 697 m. The effective stack height is 30 m. Calculate the distance downwind XL at which the plume released will reach the inversion layer and begin to mix downward.

A

5.8 km

40
Q

A town of 20,000 in Laguna generates 0.96 kg/(capita)-day of MSW. A town of the same size in the Makati City in Metro Manila generates 1.9 kg/(capita)-day of MSW.
How much MSW is generated in each town?
How many trucks would be needed to collect the waste twice weekly? The trucks each have a capacity of 4.5 MT and operate 5 days per week. Assume that the trucks average two loads per day at 75% capacity. Calculate the number and volume of MSW in tons that enter the landfill.

A

19100 kg/d and 39000 kg/d, 4 and 8 trucks, 58 m^3/d, 105 m^3/d

41
Q

Determine the area required for a new landfill site with a projected life of 30 years for a population of 250,000 generating 2.02 kg per capita per day. The density of the compacted waste is 470 kg/m3. The height of the landfill cannot exceed 15 m.

A

78.4 ha

42
Q

Calculate the volumetric flow rate of leachate through a compacted clay liner if the area of the landfill is 15 ha and the liner thickness is 1 m. The hydraulic conductivity is 7.5 × 10−10 m · s−1. Assume that the head of water is 0.6 m.

A

6.75 x10-5 m3/s

43
Q

The Nairyosangha landfill located in Peshdadians serves a population of 562,400 people generating MSW at a rate of 1.89 kg · capita−1 · day. The volume of the landfill is 11,240,000 m3. At the present time, 63% of the landfill is used. The ratio of cover to compacted fill is 1.9. Determine projected life remaining for the landfill. Assume the density of the compacted waste to be 490 kg · m−3.

A

2.76 years

44
Q

A landfill with a gas collection system is in operation and serves a population of 200,000. MSW is generated at a rate of 1.95 kg · (capita)−1 · day−1. Gas is produced at an annual rate of 6.2 L · kg−1 of MSW delivered to the landfill. The gas contains 55% methane. Gas recovery is 15% of that generated. The heat content of the landfill gas is approximately 17,000 kJ · m−3 (a value lower than the theoretical value because of dilution of the methane with air during recovery). The landfill company and a developer have proposed to build a subdivision in the vicinity of the landfill and pipe the methane generated to the homes to be used for heating. The homes are estimated to use an average of 110 × 106 kJ of heat energy each year. Peak usage during winter is 1.5 times the average usage. How many homes can be built in the subdivision?

A

7 homes

45
Q

A solution of calcium chloride is prepared in a 1 L volumetric flask. A 60-g sample of CaCl2 is added to a small amount of water in the flask, and then additional water is added to bring the total volume of the solution to 1 L. What is the concentration of calcium chloride in units of molarity?

A

0.5406 M

46
Q

A solution of HOCl is prepared in water by adding 15 mg HOCl to a volumetric flask, and adding water to the 1-L mark. The final pH is measured to be 7.0. What are the concentrations of HOCl and OCl? What percent of the HOCl is dissociated? Assume the temperature is 25degC.

A

[OCl-] = 6.39x10-5 M, [HOCl] =2.22x10-4 M, 22.4%

47
Q

The concentration of carbon dioxide in water at 20degC is determined to be 1x10-5 M. The Henry’s constant for carbon dioxide dissolution in water is 3.91x10-2 M/atm at 20degC. What is the partial pressure of the CO2 in the air?

A

2.56x10-4

48
Q

You are working in a site where a leaking underground storage tank has contaminated the soil and groundwater was analyzed and the concentrations of benzene and methyl tertiary butyl ether (MTBE) were found to be 45 and 500 micro grams per liter, respectively. At the soil temperature (10degC) the dimensionless Henry’s constants, H for benzene and MTBE are 0.09 and 0.01, respectively. Calculate the soil vapor concentrations of both chemical compounds.

A

Benzene = 0.36 micro g/L and MTBE = 5 micro g/L

49
Q

Assuming that air at sea level is composed of 20% oxygen and 80% nitrogen, determine the pressure and air composition on top of Mount Everest at 0 C̊ and air altitude of 29143ft.

A

0.333bar, yO2=0.177, yN2=0.823

50
Q

One mole of A at one bar and one mole of B at 2 bar are separated by a partition and surrounded by a heart reservoir. Determine the change in entropy when partition is withdrawn.

A

12.5 J/K/mol

51
Q

Determine the number of moles of an unknown base in a solution when titrated with 0.150 M HCl and 22.01ml of acid were needed to reach the end point of the titration.

A

3.30x10^-3 ml

52
Q

Determine the pH of 0.21 M solution of sodium benzoate in water at room temperature.

A

8.74

53
Q

Balance the following equation: 225Ac82 = ? + 4He2; when one alpha particle is lost from actinium.

A

225Ac89 = 221Fr87 + 4He2

54
Q

A certain solid compound was tested in a laboratory and was analyzed to contain 6.5% hydrogen, 42.2% carbon, and 5.5% oxygen, with a molecular weight of approximately 341.2. Determine the chemical formula.

A

C12H12O11

55
Q

Determine the:
1. Moles of analyte
2. Volume of titrant to reach end point
3. pH at the start, halfway and at the endpoint for each of the titrations performed.

For the titration shown as follows: 50mL of a weak base (pKb=5), 0.072M with 0.153M HCl.

A

3x10-3mol; 24mL; 10.84, 8.82, 5.06

COACHING- ARC (3 decks)

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