ARC Coaching Flashcards by Study Monster

Are reversible processes frictionless? Why?

a. Because the processes are driven by forces which imbalance is differential in magnitude
b. Because when reversed, retraces its forward path and restores the initial state of the system and surroundings
c. None of these
d. Because only infinitesimal changes occur

b. Because when reversed, retraces its forward path and restores the initial state of the system and surroundings

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Determine whether the following statements are TRUE or FALSE.
1. For all adiabatic processes, the entropy change of the system must be zero
2. For one component system, it is possible for two phases in equilibrium to have different chemical potentials
3. The change in Gibbs free energy can be negative for a cyclic process
4. A condition for equilibrium is that (ΔA)T,F=0

a. T, T, T, T
b. F, T, F, T
c. T, F, T, F
d. F, F, F, F

d. F, F, F, F

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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
b. Reaction will not proceed
c. None of these
d. 22.6 g

a. 40 g

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For each of the following compounds, determine the weight percentage of the
following compounds:
A. Copper in Cupric Oleate
B. Beryllium in Emerald
C. Iron in Prussian Blue
D. 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. 11.45%, 8.99%, 45.51%, 21.95%

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A magician rotates a pail of water in a vertical circle with a radius of 0.5 m and amazes the audience because no water spilled out. What is the minimum speed at which no water will spill out?

a. 3.13 m/s
b. 1.23 m/s
c. 7.2 m/s
d. 6.4 m/s

a. 3.13 m/s

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Determine the age of the mineral sample which contains 50.05 mg of 238 Uranium and 14.05 mg of 206 Lead. Assume a half-life for the process of 238 U and 206 Pb at 4.52x109 years.

a. K = 1.5x10-10 per year; 75.2 mg 238 U; 2.2x109 years old
b. K = 1.8x10-9 per year; 66.2 mg 238 U; 1.8x109 years old
c. K = 0.9x10-8 per year; 56.1 mg 238 U; 1.3x109 years old
d. K = 2.1x10-10 per year; 87.1 mg 238 U; 2.8x109 years old

b. K = 1.8x10-9 per year; 66.2 mg 238 U; 1.8x109 years old

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The person’s senses of smell and taste depend 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 identified the type of organic compound associated with the sense of smell and taste. The chemical identified was:

a. An alcohol
b. Rhodopsin
c. An ester
d. An isomer

b. Rhodopsin

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

a. 132
b. 98
c. 63
d. 211

c. 63

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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. 137Cs55
c. 210Pb82
d. 179Hf72

c. 210Pb82

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

a. 12.5 J/K
b. 18.41 J/K
c. 14.67 J/K
d. 16.33 J/K

a. 12.5 J/K

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Identify the organic compounds in the following equation:
CH3CH(OH)CH2CHO → CH3CH=CHO + H2O

a. Butanol; cis/trans butanol
b. Butanoic acid; Butanoic acid
c. Carbonyl aldehyde; cis or trans isomer
d. Butanol; butaldehyde

d. Butanol; butaldehyde

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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. 0.0203 mrem

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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. 2495 kg

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A BMW is travelling along the North Luzon Expressway towards Tarlac. If the fuel tank contains high octane gasoline, density equal to 0.71 gm/mL, How much carbon dioxide was emitted by the vehicle if its gas mileage is 19.75 miles/gal for a distance of 125 miles?

a. 52 kg CO2
b. 66 kg CO2
c. 78 kg CO2
d. 93 kg CO2

a. 52 kg CO2

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Determine how many milligrams of rubidium-84 remains after 99 days from a 10 mg sample if rubidium has a half life of 33 days.

a.2.5 mg remains
b.5 mg remains
c.0.1 mg remains
d.1.25 mg remains

d.1.25 mg remains

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Determine the percent atom economy of the Raschig Process.

a. 17.3%
b. 22.4%
c. 34.7%
d. 46.5%

a. 17.3%

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Calculate the number of moles of hydrogen ion that is required to form 1.24 moles of hydrogen. What is the mass in grams of zinc to form 0.621 mole of hydrogen?

a. None of these
b. 2.44 moles hydrogen; 40.6 grams zinc
c. 4.88 moles hydrogen; 60.3 grams zinc
d. 1.22 moles hydrogen; 60.3 grams zinc

b. 2.44 moles hydrogen; 40.6 grams zinc

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In a precipitation reaction, determine the volume of AgNO3 solution needed when 5.05 grams of AgNO3 per liter is mixed with 5.1 grams BaCl2 in a 25 mL solution.

a.40.8 mL
b.50.2 mL
c.38.2 mL
d.45.6 mL

a.40.8 mL

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If Raoult’s Law applies for dilute solutions and osmotic pressure at equilibrium is estimated using the relationship (RT/Va) x ln(Pa°/Pa) where R is 0.0881 atm/mol- K, T is in Kelvin and Pa° and Pa are the vapor pressures in dilute and concentrated solutions, given that the Va is 0.018 L for water, estimate the osmotic pressure difference across a semi-permeable membrane with brackish water on one side and mineral free water on the other at 25 deg C. If a yield of 75% is required, what is the minimum pressure needed to balance the osmotic pressure difference that will develop?

a. 46.1 psi, 120 psi
b. 52.2 psi, 131 psi
c. 30.2 psi, 99 psi
d. 26.8 psi, 108 psi

d. 26.8 psi, 108 psi

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If a labelled fatty acid with radioactive Carbon-14 is fed to an experimental animal, in what type of compounds contained in the breath of the animal would the radioactive material appear?

a. As nitrogen
b. As CO2
c. As water vapor
d. As hydrogen

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Define gluconeogenesis.

a. Positive ions are smaller and negative ions are smaller than their corresponding atoms
b. Positive ions are larger and negative ions are larger than their corresponding atoms
c. Positive ions are smaller and negative ions are larger than their corresponding atoms
d. Positive ions are larger and negative ions are smaller than their corresponding atoms

c. Positive ions are smaller and negative ions are larger than their corresponding atoms

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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. 134th row

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

a. 401
b. 101
c. 4.01
d. 1.1

b. 101

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What is the Nujol Mull in organic chemical reactions?

a. It is a mass spectrum technique and is obtained by grinding up a solid which is mixed with mineral oil to form a suspension for IR spectroscopy
b. It is the name of a type of paraffin oil from India and most often used in gas chromatography to enhance the mass transfer properties of compounds
c. It is a process applied for inorganic compounds to determine the effervescence of the compound under study
d. It is suspension in mineral oil which is placed in between HgCl, AgI and KCl or stainless steel plates to obtain a good spectrum

a. It is a mass spectrum technique and is obtained by grinding up a solid which is mixed with mineral oil to form a suspension for IR spectroscopy

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The lead acid battery offers a great advantage over the common flashlight battery. Balance the equation: PbSO4 + H2O → Pb + PbO2 + H2SO4 a. 2, 2, 1, 1, 2 b. 6, 3, 9, 9 c. 1, 4, 2, 2, 6 d. 4, 4, 2, 8

a. 2, 2, 1, 1, 2

When travelling at NLEX at 80mph, a stopped car in front causes you to suddenly skid to stop. What happened to the kinetic energy of the moving car? a. Some of it were converted to internal energy and some transferred to the road and surroundings b. It was transferred to the internal energy of the road c. All of it transferred to the road and surroundings d. All of it are still in the car

a. Some of it were converted to internal energy and some transferred to the road and surroundings

What is the empirical formula of a sample of cement found to contain 14.21 g of molybdenum and 8.31 g of silicon? a. MoSi b. Mo2(SiO2)2 c. Mo3(SiO3)3 d. MoSi2

d. MoSi2

In the combustion of 26 g of methane gas, determine the volume of oxygen needed at a temperature of 25.5 ̊C and 0.22 atm. a. 365 L b. 267 L c. 550 L d. 465 L

a. 365 L

What is the average temperature of the moon if the solar radiation currently reaching the earth’s top temperature is 1.34 W/m2 and the greenhouse effect of the atmosphere applies and emissivity is the same for all kinds of electromagnetic waves at no atmosphere? a. 5,800 K b. 277 K = 4 deg C c. -12 deg C d. 300 K

b. 277 K = 4 deg C

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. C10H14O16 b. C12H12O11 c. C6H12O6 d. C11H16O22

b. C12H12O11

Determine the uncertainty in position of a proton that moves at 1/10 the velocity of light. Assume the velocity is measured with a precision of 1%. a. 4.67 m b. 1x10^-13 m c. 0.001528 m d. 3x107 m

b. 1x10^-13 m

Balance the following equation: 225Ac82 = ? + 4He2; when one alpha particle is lost from actinium. a. 221Ac85 = 217Fr83 + 4He2 b. 225Ac89 = 221Fr87 + 4He2 c. 225Ac82 = 226Fr83 + 4He2 d. 223Ac91 = 233Fr91 + 4He2

b. 225Ac89 = 221Fr87 + 4He2

When a thorium-230 atom undergoes alpha decay, the products of the reaction are usually: a. Radium and an alpha particle b. Actinium and an alpha particle c. Actinium and a positron d. Radium and a positron

a. Radium and an alpha particle

What is the theory in two or three dimensional collision to be applied when playing billiard balls and in order to sink the target ball in the corner pocket? a. The center of the mass theory where the center of the mass of the system moves as all the mass in the system wereconc entrated at that point, and one of them is initially at rest, and they were in perpendicular direction of the collision b. Proton-proton elastic collision c. The component of momentum an isolated system in each of the directions (x, y, z) are conserved independently d. Where two equal masses undergo a glancing elastic collision

d. Where two equal masses undergo a glancing elastic collision

In the study of fats and lipids, determine which of the two triglycerides has a higher melting point: substance A –containing only lauric acid and glycerol, or substance B – containing only stearic acid and glycerol. a. Both have the same melting points b. B c. A d. None of these

b. B

To which subatomic particle does each statement refer to? 1. Has a positive charge 2. Is found outside the nucleus 3. Has the smallest mass 4. Has a negative charge a. Proton, electron, electron, electron b. Proton, electron, proton, electron c. Electron, electron, proton, proton d. Electron, proton, electron, proton

a. Proton, electron, electron, electron

What is the color of the light of a 75 W light source that was able to emit 9.91x10^20 photons of a monochromatic radiation for 5 s? a. Red b. Yellow c. Blue d. Green

d. Green

What is the formula of the ionic compound that is formed between the following ions: lithium and chloride ions; lithium and oxide ions; lithium and nitride ions? a. Li3Cl; Li3O2; LiN b. Li4Cl2; Li3O3; LiN3 c. Li2Cl2; LiO2; LiN3 d. LiCl; Li2O; Li3N

d. LiCl; Li2O; Li3N

In the collision theory of chemical kinetics, it is suggested that reaction rate is governed by the relationship rate=Pze-E/RT. What can an enzyme do to the activation energy of the reaction E? a. Enzymes can raise temperature to make the reaction proceed faster b. None of these c. Enzymes bind the reactants in close proximity for a longer period in order to get the reaction energy going d. Enzymes provide an alternative reaction pathway in lowering the energy level of the reaction

d. Enzymes provide an alternative reaction pathway in lowering the energy level of the reaction

Give the technical names of: Sc3+; Ti2+ ; and Sr2+. a. Transition metal ions b. Scandium 3 plus ion; titanium 2 plus ion; strontium 2 plus ion c. Scandium (III) ion; titanium (II) ion; strontium (II) ion d. Scandium 44/31 ion; titanium 47/22 ion; strontium 87/38 ion

c. Scandium (III) ion; titanium (II) ion; strontium (II) ion

What is the molecular weight of a sample of cellulose acetate if its 0.2% (w/v) solution in acetone (sp. gr. = 0.80) shows an osmotic rise of 23.1 mm against pure acetone at 27 deg C? a. 19,900 g/mol b. 27,500 g/mol c. 32,600 g/mol d. 44,800 g/mol

b. 27,500 g/mol

Determine the number of moles of sulfuric acid needed to form 66g of calcium sulfate using calcium carbonate. a. 0.889 b. 0.49 c. 0.332 d. 1.243

b. 0.49

Whatever the compound, the gram molecular weight contains the same number of molecules, known as the Avogadro’s number. It is expressed as: a. 6.02x10^23 particles per mole b. 6.02x10^23 ions per mole c. 6.02x10^23 atoms per mole d. 6.02x10^23 electrons per mole

a. 6.02x10^23 particles per mole

The coexistence curve where the plot of pressure versus temperature along which the two phases coexist was shown by Clausius- Clapeyron. What did Clausius postulate? a. The Clapeyron equation was simplified by assuming that the vapor obeys the ideal gas law and by neglecting the molar volume of the liquid VL in comparison with the molar volume of the gas VG b. The Clausius-Clapeyron equation does not apply to this situation c. The Clausius-Clapeyron theory is applicable only for vaporization and sublimation condition d. Both scientists apply their postulates to linear and curvilinear representation

a. The Clapeyron equation was simplified by assuming that the vapor obeys the ideal gas law and by neglecting the molar volume of the liquid VL in comparison with the molar volume of the gas VG

What is the organic molecular formula of Lindane, a chlorinated pesticide which has been banned, if it is composed of 24.781% carbon, 2.082% hydrogen, and 73.142% chlorine and has a molecular mass of 290.834? a. C3H6Cl12 b. (CHCl)6 c. C6H12Cl6 d. C3H6Cl6

b. (CHCl)6

Define the relationship between the number of electrons in the valence shell and the number of covalent bonds it forms: 1. Carbon 2. Nitrogen 3. Oxygen 4. Hydrogen a. C = 4 electrons, 4 bonds; N = 5 electrons, 3 bonds; O = 6 electrons, 2 bonds; H = 2 electrons, 2 bonds b. C = 5 electrons, 2 bonds; N = 6 electrons, 4 bonds; O = 3 electrons, 1 bond; H = 2 electrons, 3 bonds c. C = 6 electrons, 13 bonds; N = 4 electrons, 2 bonds; O = 2 electrons, 1 bond; H = 2 electrons, 1 bond d. C = 2 electrons, 4 bonds; N = 3 electrons, 3 bonds; O = 2 electrons, 2 bonds; H = 4 electrons, 3 bonds

a. C = 4 electrons, 4 bonds; N = 5 electrons, 3 bonds; O = 6 electrons, 2 bonds; H = 2 electrons, 2 bonds

What organic product is formed when C6H5CH2COOH is treated with CH3OH + H2SO4 (catalyst)? a. C6H5CH2CH2OH b. C6H5CH2COONa + CO2 + H2O c. C6H5CH2COONH4 d. C6H5CH2CO2CH3 + H2O

d. C6H5CH2CO2CH3 + H2O

If the temperature at the beginning of the compression process of an air standard Otto cycle is 27 ̊C at a compression ratio of 8, pressure at 101.1kPa and cylinder volume of 566.2cm3 , determine the: 1. The thermal efficiency 2. The mean effective pressure using the PG model for air. Maximum temperature during the cycle is 1727 ̊C. 3. If the IG model was used, find the answers. a. 56.5%, 710.2kPa, 51%, 806kPa b. 43.2%, 620.5kPa, 61%, 906kPa c. 58.5%, 750.2kPa, 71%, 760kPa d. 65.8%, 810.8kPa, 81%, 660kPa

a. 56.5%, 710.2kPa, 51%, 806kPa

Determine the volume in mL of 1mol of pure ethyl alcohol. a.10mL b.58mL c.46mL d.78mL

b.58mL

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 ̊C and air altitude of 29143ft. a. 0.299bar, yO2=0.179, yN2=0.866 b. 0.333bar, yO2=0.177, yN2=0.823 c. 0.516bar, yO2=0.236, yN2=1.021 d. 0.411bar, yO2=0.187, yN2=0.911

b. 0.333bar, yO2=0.177, yN2=0.823

Define a salt in terms of acid and base. a. A salt is a compound that follows Le Chatelier’s Principle in reactions with other compounds. b. All of these c. A salt is a compound formed when the nucleus of a hydrogen tom enters a quantity of water. d. A salt is a compound (other than water) produced by the reaction of an acid and a base.

d. A salt is a compound (other than water) produced by the reaction of an acid and a base.

In a standard chemical reaction, rate is governed by the relationship rate=pze-E/RT, where p and z refer to the probability that reacting molecules make a favorable encounter. To increase the probability of reaction, enzymes are employed. Based on the above equation, if E is the activation energy, which is more favorable and why? A lower or higher E? a. Lower E so that more molecules possess sufficient energy to react b. Higher E so that a better nucleophile and electrophile are catalyzed c. Lower E so that a proton can be donated or stolen for the reactants leading to better catalysis d. Higher E so the bonds of the reactants will be strained and provide more power transition state condition

a. Lower E so that more molecules possess sufficient energy to react

In order to describe the intensive state of a system at equilibrium, specify the degrees of freedom for a one- phase, two-phase and three-phase system. a. F=2, F=1, and F=0 b. F=1, F=2, and F=3 c. F=0, F=1, and F=2 d. F=3, F=2, and F=1

a. F=2, F=1, and F=0

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 b. 3, 2, 2, 3, 6 c. 1, 1, 2, 1, 4 d. 2, 2, 4, 2, 4

a. 4, 1, 2, 4, 8

If 1mol of an ideal gas is kept at 0 ̊C, during an expansion from 1L to 10L, how much work is done by the gas during expansion? a. -2.2x104J b. -5x103J c. -2.7x103J d. -7.8x105J

c. -2.7x103J

Balance the equation: CH3CH2CH3 + O2 → CO2 + H2O a. 1, 5, 3, 4 b. 3, 2, 1, 4 c. 2, 1, 1, 5 d. 1, 2, 2, 3

a. 1, 5, 3, 4

What is the buckyball? a. An epoxy resin b. C60H+++ c. A fullerene d. Sodium benzoate

c. A fullerene

Determine the number of moles and grams of N2HPO4 in 1.75L in 0.46M of NaHPO4 solution. a. 0.556mol; 85g b. 0.805mol; 114g c. 0.46mol; 185g d. 0.656mol; 90g

b. 0.805mol; 114g

The element neon was discovered in 1898 by: a. Marks and Howell b. Travers and Ramsay c. Davy and Russel d. Pontin and Berzelius

b. Travers and Ramsay

When a can of soda is opened and CO2 is released to the atmosphere, what is the resultant pH of the soda? a. Decreases b. Increases c. The same d. All these

b. Increases

Draw the condensed and skeletal structures of diethyl ether which is used by most doctors and hospitals as an anesthetic during operations. a.C2H5OC2H5 b.C6H6O6 c.C5H10O d.CH3CH2OCH2CH3

d.CH3CH2OCH2CH3

Determine the half life of the decay process for a sample of Curium-243 when analysis showed that the activity of the sample decreased to 2923 disintegrations per second from the original 3011 dps. a. K = 0.0307x10-1/yr; t1/2 = 22.6 yrs b. K = 4.1x10-2/yr; t1/2 = 34.5yrs c. K = 0.2x10-1/yr; t1/2 = 28.6yrs d. K = 5.2x10-3/yr; t1/2 = 46.6yrs

c. K = 0.2x10-1/yr; t1/2 = 28.6yrs

What are sigmatropic rearrangements in organic reactions? a. They are similar to the (3, 3) cope rearrangement where the beta ring of a steroid undergoes photon activated retro electrocyclization b. They are thermal reactions which do not allow the formation of six membered benzene ring with a cis- or trans-alkene, such as in the formation of vitamin D. c. They are different from electrolytic reactions wherein a movement of a sigma bond with a simultaneous rearrangement of the pi-system does not occur d. They are not the same as the (3, 3) cope arrangement and the beta ring does not undergo photon activated retro electrocyclization

a. They are similar to the (3, 3) cope rearrangement where the beta ring of a steroid undergoes photon activated retro electrocyclization

Applying the Gibbs phase rule in the degrees of freedom, determine the number of degrees of freedom of: 1. Liquid water in equilibrium with its vapor 2. Liquid water in equilibrium with a mixture of water vapor and nitrogen 3. A liquid solution of alcohol in water in equilibrium with its vapor a. F = 1; F = 4; F = 3 b. F = 2; F = 3; F = 3 c. F =1; F = 2; F = 2 d. F = 2; F = 3; F = 2

c. F =1; F = 2; F = 2

Twenty-five bone samples from Mindoro is believed to have come from a new species of prehistoric humanoids. The activity of carbon- 14 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 65,000 to 70,000 years old b. Between 70,000 to 75,000 years old c. Between 75,000 to 80,000 years old d. Between 80,000 to 85,000 years old

b. Between 70,000 to 75,000 years old

What is the Clapeyron Equation? a. Any of these b. It postulates that the colligative properties, freezing point depression, boiling point elevation, osmotic pressure, and vapor pressures are all dependent on the number f particles in the solution and any change thereof is described. c. It postulates that if two components systems consisting of solid and liquid phases are miscible in the liquid state and immiscible in the solid state, only the pure solid systems will separate out on cooling solutions. d. It postulates that if the temperature and pressure are both change in such a way as to keep the chemical potentials of two phases equal to each other, the rates of change are given by the equation.

d. It postulates that if the temperature and pressure are both change in such a way as to keep the chemical potentials of two phases equal to each other, the rates of change are given by the equation.

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 minus 210 ̊C? a. Minus 300 K b. 63 K c. 85 K d. 4.1 K

b. 63 K

Calculate the net and the gross heats of combustion for methane gas. a.-491 kJ/mol; -998 kJ/mol b.-362 kJ/mol; -731 kJ/mol c.-891 kJ/mol; -802 kJ/mol d.-598 kJ; -1120 kJ/mol

c.-891 kJ/mol; -802 kJ/mol

Determine the pH of a 0.21 M solution of sodium benzoate in water at room temperature. a. 6.35 b. 4.37 c. 8.74 d. 2

c. 8.74

If 5 g of methane gas is burned at constant pressure, determine the heat released in kJ if the change in entropy that accompanied the reaction is -890 kJ. a. -360.00 K b. -250.01 K c. -278.12 K d. -192.00 K

c. -278.12 K

In a gas mixture containing 100 mg/L H2S gas at 25 ̊C and 1 atm, determine the partial pressure exerted by the gas. a. 0.071 b. 0.003 c. 0.101 d. 0.006

a. 0.071

How many moles of beryllium would a 43.1 lb sample of pure aquamarine with formula Be3Al2(SiO3)6 contain? a. 3.2x10^3 mol b. 4.53 mol c. 1.1x10^2 mol d. 5.38x10^3 mol

c. 1.1x10^2 mol

Choose the process that occurs with a decrease in entropy. a. Freezing of water b. Boiling of water c. Dissolving salt in water d. Sublimation of dry ice

a. Freezing of water

Biochemical compounds are either hydrophilic, hydrophobic, or amphipathic. Classify the following compounds: glucose, stearic acid, soaps, fatty acids a. Amphipathic, amphipathic, hydrophobic, hydrophobic b. Hydrophilic, hydrophobic, amphipathic, hydrophobic c. Hydrophilic, amphipathic, amphipathic, hydrophobic d. Hydrophobic, hydrophilic, hydrophobic, amphipathic

c. Hydrophilic, amphipathic, amphipathic, hydrophobic

Balance the following oxidation, reduction reaction equation: KMnO4 + FeSO4 + H2SO4 → Fe2(SO4)3 + K2SO4 +MnSO4 + H2O a. 2, 10, 8, 5, 1, 2, 8 b. 5, 2, 10, 1, 5, 2, 10 c. 3, 5, 8, 1, 1, 2, 5 d. 4, 1, 8, 2, 8, 1, 10

a. 2, 10, 8, 5, 1, 2, 8

These compounds are formed by the reaction of acids with alcohols. a. Ethers b. Esters c. Bases d. Enzymes

b. Esters

Determine which of the following substances will float or sink in water: balsa wood, ethylene glycol, table salt, ethanol a. Float, sink, sink, float b. Float, float, float, float c. Sink, float, sink, float d. Sink, sink, sink, sink

a. Float, sink, sink, float

Determine the area required for a new landfill in Batangas province with a projected life of 30 yrs for a population of 250,000 people generating 2.1 kg/capita-day. The density of the compacted waste is 472 kg/m3. The height of the landfill should not exceed 16 m. a. 95 ha b. 65 ha c. 78 ha d. 88 ha

c. 78 ha

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. 9.36% b. 15.21% c. 12.5% d. 8.22%

c. 12.5%

If an ideal gas occupies 0.3 L at a pressure of 1.78 atm, determine the new volume if the gas is maintained at the same temperature and the pressure is reduced to 1.31 atm. a. None of these b. 0.627 L c. 0.473 L d. 1.11 L

c. 0.473 L

If aspirin is made using the raw materials salicylic acid and acetic anhydride with a yield of 75%, how many grams of aspirin will be produced? a. 25 b. 30 c. 15 d. 10

a. 25

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. 1⁄2

If the normality of HCl is greater by 10% compared to KOH, estimate the normality of the HCl solution when 0.67 g of (NH4 )2SO4 is dissolved in water, treated with excess NaOH and the ammonia released is passed through a solution of 20 mL of HCl. The excess acid solution is titrated using 15.01 mL of KOH solution. a. 0.275 N b. 3.17x10^-3 N c. 0.152 N d. 2.32x10^-2 N

c. 0.152 N

The Tanay Rizal Stone Works employs 6 workers who produce uncompacted waste from the products formed for building decors. If the density of the uncompacted waste is 480 kg/m3, determine annual volume of solid waste produced by the factory assuming a waste generation volume rate of 1 kg/capita-day. a. 3.22 m3/day b. 5.56 m3/day c. 8.01 m3/day d. 4.65 m3/day

d. 4.65 m3/day

What type of polymer is used for bulletproof vests? a. Linear polyethylene fiber b. Polyacrylonitrate fiber c. Polycarbonate fiber d. Polymethacrylate fiber

a. Linear polyethylene fiber

In the metal plating plants in Cagayan de Oro and Ilagan, the waste contains 20 ppm of Cu2+. It was decided that to precipitate most of the copper in water, Ca(OH)2 will be used, until only 0.5 ppm of Cu remains. Estimate the hydroxide concentration needed in mol/L needed to accomplish this. a. 3.2x10^-5 M b. 4.2x10^-4 M c. 1.6x10^-7 M d. 2.1x10^-6 M

c. 1.6x10^-7 M

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. 6.13 g/L

Are galvanic cells and electrolytic cells the same? Why? a. No. because galvanic cells are electrochemical cells in which chemical cells occur simultaneously; while in electrolytic cells, the chemical reaction is caused by an externally applied potential difference. b. No, because galvanic cells need a constant supply of electricity while electrolytic cells depend on intermittent source of power. c. Yes, because they are both electrochemical cells and their uses are common to each other d. Yes, because galvanic cells and electrolytic cells are both electrochemical cells.

a. No. because galvanic cells are electrochemical cells in which chemical cells occur simultaneously; while in electrolytic cells, the chemical reaction is caused by an externally applied potential difference.

Analyze and determine the mass weight in milligrams of a 2.01 mg sample of an isotope 83Bi has a half-life of 1.03 yrs that has not decayed after 3.77x103 hrs. a. 1.49 b. 2.05 c. 1.82 d. 0.95

a. 1.49

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 at 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. 2.51x10^10 years old

If one gallon of blood was added in three gallons of water, and one ounce of that dilution was added to 9 ounces of water, what is the final dilution when 7 mL of that dilution was added to 563 mL of water? a. 5.65x10^-3 b. 2.24x10^-2 c. 1.72x10^-4 d. 3.11x10^-4

d. 3.11x10^-4

State Le Chatelier’s Principle. a. Le Chatelier’s principle states that when a stress is placed on a system in equilibrium, the system tends to change in a way that relieves the stress. b. All of these c. Examples of the application of Le Chatelier’s principle are blowing your breath through a straw and dissolving alka seltzer tablet in a glass of water. d. Le Chatelier’s principle explains both the formation and decomposition of acids, where anything that might act to increase the concentration of an acid would produce an increase in the other components so as to keep the numerical

a. Le Chatelier’s principle states that when a stress is placed on a system in equilibrium, the system tends to change in a way that relieves the stress.

An adiabatic process is one in which the system under investigation is thermally isolated so that there is no exchange of heat with the surroundings. Thus, the work done on a closed system in an adiabatic process is _____. a. Equal to zero b. Not equal to the exchange of heat with surroundings c. Equal to the increase in internal energy of the system d. Not equal to the increase in internal energy of the system

c. Equal to the increase in internal energy of the system

If a water sample was found to contain 19.2 mg/L of magnesium ion and 44.3 mg/L of calcium ion, express the amount of hardness in mg/L of calcium carbonate. The sample case from a Maynilad water source. a. 156 mg/L b. 200 mg/L c. 189 mg/L d. 175 mg/L

c. 189 mg/L

If a person breathes 100 breaths per minute and is aged 75, how many breaths will he/she have during his/her lifespan? a. 3.942x10^9 b. 5.256x10^6 c. 4.923x10^6 d. 6.044x10^5

a. 3.942x10^9

Define what is DNA and RNA a. Beta ribose phosphoric acid and 1,2 ribonucleic acid b. Deoxyribonucleic acid and ribonucleic acid c. dioxyl nucleic acid and cytosine d. 1,2-deoxyribose and cytosine

b. Deoxyribonucleic acid and ribonucleic acid

Determine the best combination of plant and location to best conserve the environment, given the following data: KD=deoxygenation rate constant KR=reaeration rate constant TC=travel time of wastewater discharge D=oxygen deficit DO=dissolved oxygen actual concentration a. Plant B in Marikina River b. Plant B in Pasig River c. Plant A in Marikina River d. Plant A in Pasig River

a. Plant B in Marikina River

Calculate the heat of vaporization in kJ/mol of a compound with the following characteristics. a. 33.06 kJ/mol b. None of these c. 44.62 kJ/mol d. 36.99 kJ/mol

a. 33.06 kJ/mol

When formic acid is 4.6% ionized in 0.105 M of aqueous solution at room temperature, determine the ionization constant of the acid. If the solution containing 0.25 N of 25 mL acid is diluted to 202 mL and titrated 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; 8.7x10^-9 b. 1.8x10^-5; 9.1; 7.2x10^-10 c. 4.1x10^-4; 7.21; 6.4x10^-10 d. 3.4x10^-4; 6.32; 5.23x10^-11

a. 2.2x10^-4; 8.06; 8.7x10^-9

In a dehydration reaction where water is lost, an organic compound C3H8O reacts with concentrated phosphoric acid and a product is formed. This product rapidly decolorizes a solution of bromine in tetrachloromethane. What is this product? a. Propanol b. 2-propanol c. Propene d. 1-propanol

c. Propene

If enthalpy is defined as present in a constant pressure process change of state, using the relationship of ΔH=ΔU+ΔPV, where H is enthalpy, U is the energy change in the system and PV represents pressure and volume states, determine the ΔU and ΔH of 1kg of water when vaporized at constant temperature of 100 ̊C and constant pressure of 101.35kPa. The specific volumes of liquid and vapor water are 0.001041 and 1.67m3/kg. An amount of 2257kJ of heat is added to thewater. a. ΔU=2087kJ; ΔH=2257kJ b. ΔU=2378kJ; ΔH=2221kJ c. ΔU=2226kJ, ΔH=2378kJ d. None of these

a. ΔU=2087kJ; ΔH=2257kJ

When 12 g of carbon are mixed with 64.2 g of O2, calculate how many grams of CO2 will be formed. a. 12 g b. 32 g c. 64 g d. 44 g

d. 44 g

A solution of HCl and a monobaric acid is titrated with NaOH. If the initial volume of the solution is 100 mL and the concentration of each moment is 0.011 M and the ionization constant is 1.01x105 and the concentration of the titrant base is 0.1 M, estimate the pH of the solution when 5 mL and 15 mL of the titrate has been added and the optimum pKa of a weak acid indicator to allow determination of the HCl present. a. 2.3, 5.0, 3.5 b. 3.7, 6.0, 4.5 c. 3.4, 4.5, 5.2 d. 4.2, 7.0, 6.2

a. 2.3, 5.0, 3.5

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. (C2H2N2)4 b. (C3H3N3)3 c. C4H8N4 d. (CH2N2)3

d. (CH2N2)3

Fatty acid such as lauric acid and palmitic acid and oleic acid are long unbranched carboxylic acids consisting of 12 to 20 carbon atoms. Which type of fatty acid should people avoid ingesting, saturated or unsaturated and why? a. Saturated, because the risk of cardiovascular disease is increased b. Fatty acids are safe to ingest c. Unsaturated, because the risk of cardiovascular disease is increased d. Both fatty acids, because the risk of cardiovascular disease is increased

a. Saturated, because the risk of cardiovascular disease is increased

A new radioisotope, represented has been isolated by scientists from CERN. A nuclear chemist 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. 6.59x10^5 Ci b. 3.76x10^5 Ci c. 2.87x10^5 Ci d. 7.11x10^5 Ci

b. 3.76x10^5 Ci

Determine the decay product of americium 241 and the percentage remaining of the original americium after 1000 yrs. It is given that americium 241 has a half-life of approximately 432 yrs and it is known to be an alpha emitter. a. Neptunium 237; 25% b. Berkelium 246; 85% c. Tritium 6; 65% d. Bismuth 209; 45%

a. Neptunium 237; 25%

Name the major physiologically active substances that comes from: bark of the willow tree, the pituitary gland, the sap of the poppy, and the belladenna plant. a. Cocaine, reserpine, salicin, atropine b. Reserpine, atropine, β-endomorphin, opium c. Opium, cocaine, salicin, reserpine d. Salicin, β-endomorphin, opium, atropine

d. Salicin, β-endomorphin, opium, atropine

A hypothetical gas has a density of 1.2504 g/L at STP. Calculate the following in terms of cm/s: Modal speed a. 4.51x104 cm/s b. 4.33x104 cm/s c. 4x104 cm/s d. 4.9x104 cm/s

c. 4x104 cm/s

A hypothetical gas has a density of 1.2504 g/L at STP. Calculate the following in terms of cm/s: Average speed a. 4.51x104 cm/s b. 4.33x104 cm/s c. 4x104 cm/s d. 4.9x104 cm/s

a. 4.51x104 cm/s

A hypothetical gas has a density of 1.2504 g/L at STP. Calculate the following in terms of cm/s: Root-mean-square a. 4.51x104 cm/s b. 4.33x104 cm/s c. 4x104 cm/s d. 4.9x104 cm/s

d. 4.9x104 cm/s

Domingo were able to create two new compounds from two hypothetical elements A and B. The compounds properties were measured as follows [a.] 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. [b.] A solution comprised of 95.27 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. 507 g/mol

Domingo were able to create two new compounds from two hypothetical elements A and B. The compounds properties were measured as follows [a.] 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. [b.] A solution comprised of 95.27 grams of AB4 in 41.77 grams of ethanol boiled at 83.60 deg Celsius. What is the molecular weight of AB4? a. 172 g/mol b. 933 g/mol c. 545 g/mol d. 467 g/mol

d. 467 g/mol

For a batch of compromised plutonium fuel rods that are being disposed off, an 85 kg worker accidentally inhaled 1 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. 8.64x10-6 Sv

For a batch of compromised plutonium fuel rods that are being disposed off, an 85 kg worker accidentally inhaled 1 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 absorbed dose? a. 6.32x10-7 Gy b. 5.42x10-5 Gy c. 1.28x10-7 Gy d. 2.73x10-4 Gy

c. 1.28x10-7 Gy

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. 0.57 mCi

What is the molecular geometry of CO2, H2S,and XeF4? a. Linear, Seesaw, Square Pyramidal b. Bent, Tetrahedral, T-Shaped c. Linear, Bent, Square Planar d. Octahedral, Square Planar, Seesaw

c. Linear, Bent, Square Planar

An antique capillary tube is submitted to the National Museum. The said tube, fixed horizontally in its display case, contains a 10 cm air column being blocked by an 8 cm column of mercury towards the open end of the said tube. What will be the length of the air column when the tube is fixed vertically with the open end down, assuming that the pressure prior to changing its orientation is 1 atm? a. 9 cm b. 11.2 cm c. 10.1 cm d. 12.3 cm

b. 11.2 cm

Sambong Leaves from Zamboanga del Norte were collected by the Philippine Council for Health Research and Development in order to extract the Chlorophyll from it. What is the % weight of Nitrogen in the Chlorophyll samples? a. 2.72% b. 6.28% c. 8.77% d. 9.22%

b. 6.28%

A piece of Calcium metal is shined with a light of wavelength 345 nm. The photoelectric work function of calcium is 4.34x10-19 J. What is the speed of the ejected electron? a. 2.25x105 m/s b. 4.05x105 m/s c. 5.6x105 m/s d. 6.55x105 m/s

c. 5.6x105 m/s

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