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PROB SOLVING PBE > DAY 1 PBE > Flashcards

DAY 1 PBE Flashcards

1
Q

Given Pb and U – 238…0.3g of lead and 1.7g of uranium, if the half-life of the latter is 4.5x109 years and assuming that all the lead comes from the decay of uranium, estimate how old is the earth?

A

1.2x109 yrs

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2
Q

Which of the following blocks has a greater number of elements? s,p,d or f

A

d block

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3
Q

If the cosmic radiation discovered by the two Nobel prize winners in 1965 has a perfect black body spectrum with a temperature of 3.01K, at what wavelength is the most intense radiation? In what range of electromagnetic radiation does this wavelength fall?

A

9.62x10-4 m; infrared

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4
Q

EDTA -

A

Ethylenediaminetetraacetic acid, C10H16N2O8, chelating agent, Gerold Schwarzenbach

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5
Q

Laguna lake is found to have 100 mg/L of CO32- find the maximum concentration of Ca2+ ion.

A

100 ppm

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6
Q

30 μA and 40 sec, how many electrons passed through the cathode ray tube?

A

1.2437x10-8 electrons

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7
Q

How many Mn2O4 can be produced in grams, ounce, and mole from 1 gram of Mn2O2?

A

1 mole Mn2O4
173.88 grams Mn2O4
6.13 ounces Mn2O4

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8
Q

Mn metal is produced from ore containing 29.5% Mn(OH)2, if 1ton of metal is to be produced, how much ore is needed?

A

5.5 tons ore

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9
Q

Moles of chlorine dioxide that can be formed from a given mass of sodium hypochlorite
2NaClO2 + 2HCl + NaOCl 🡪 2ClO2 + 3NaCl + H2O

A

0.027 moles/g

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10
Q

density of acetylene gas -

A

0.02 g/mL

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11
Q

What is the composition as mass percent of the sample mixture? -

A

44%

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12
Q

40 mL of an acetic acid solution -

A

0.07 M

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13
Q

specific conductance -

A

58

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14
Q

C6H5OOH solution with 0.30 M KOH -

A

8.63

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15
Q

molar mass of sodium diatrizoate -

A

639 g/mol

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16
Q

charge on the ruthenium ions -

A

+3

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17
Q

Given box with D=1.59 m., E=48.69 J, μ=0.207. What is the mass of the box?

A

15.1 kg

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18
Q

1mol of gas A at 1bar and 1mol of gas B at 2bar. If the membrane separating the two gas mixtures is removed, find the entropy change of the mixture.

A

11.5 J/K

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19
Q

What happens to the enthalpy content of the real gases when it is throttled at constant temperature?

A

Enthalpy will not change

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20
Q

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?

A

72 kg

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21
Q

What is the sign convention of enthalpy in an endothermic process?

A

Positive

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22
Q

Calcium dihydrogen phosphate, Ca(H2PO4)2, and sodium hydrogen carbonate, NaHCO3, are ingredients of baking powder that react to produce CO2, which causes dough or batter to rise: Ca(H2PO4)2(s) + NaHCO3(s) → CO2(g)+H2O(g)+CaHPO4(s)+Na2HPO4(s) [unbalanced] If the baking powder contains 31% NaHCO3 and 35% Ca(H2PO4)2 by mass: (a) How many moles of CO2 are produced from 1.00 g of baking powder? (b)If 1 mol of CO2 occupies 37.0 L at 3508F (a typical baking temperature), what is the volume of CO2 is produced from 1.00 g of baking powder?

A

0.004756 mol CO2, 0.176 L

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23
Q

What is the ideal gas law that applies when a balloon is expanding when heated?

A

Charles Law

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24
Q

How many grams of NaCl is required to make 200 mL aqueous solution of 5%(w/v) NaCl?

A

10g

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25
Q

The height of the mercury column in a barometer in a Calcutta laboratory was recorded to be 75 cm. Calculate this pressure in SI.

A

10x10^4 N/m^2

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26
Q

Freezing point - due to the addition of solutes, the boiling point tends to increase, and freezing point tends to decrease.

A
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27
Q

What is sacrificial protection in iron: aluminum, magnesium, tin, silver, lead

A

magnesium

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28
Q

What is the unit of Stefan Boltzmann in ergs?

A

5.67037×10-5 erg⋅cm−2⋅s−1⋅K−4

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29
Q

% v/v ng 1 teaspoon ng milk pag linagay mo sya sa 1 cup.

A

48 teaspoons in 1 cup.

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30
Q

normal boiling point of CCl4 -

A

77

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31
Q

discharge pipe from a sump pump -

A

56 min

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32
Q

heat 50.0 g of an unknown substance -

A

ethanol

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33
Q

Internal energy is composed of:

A

kinetic and potential energy

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34
Q

Synthesis of Valium.

A

CHLORINATION OF AROMATICS IN FeCl3

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35
Q

Name of reaction for Dye production

A

Diazotization

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36
Q

What is the danger of using pure methane as a household fuel for heating and cooking?

A

Very low boiling point and ignition temperature

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37
Q

Steps in formation of PVC
a. Calcium carbide – vinyl chloride – PVC
b. Calcium carbine – acetylene – vinyl chloride – PVC

A

b. Calcium carbine – acetylene – vinyl chloride – PVC

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38
Q

What is the most polar and least polar of the following functional groups: R-OH, R-NH3, R-COOH, C triple bond C and C-C.

A

MOST POLAR: RCOOH
LEAST POLAR: C-C TRIPLE BOND

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39
Q

The range of melting point of the fatty acids.

A

> 43.2 degrees Celsius

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40
Q

Arrange from most to least polar: HF, CN, C-C

A

HF > CN > C-C

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41
Q

Which is heterocyclic? ANS.

A

PYRAN AND FURAN

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42
Q

over the lifetime of the plant -

A

T, T ,T

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43
Q

What is the most polar and least polar of the following functional groups? R-OH, R-NH3, R-COOH, C≡C and C-C., R-COOH > R-OH > R-NH3 > -C≡C- > -C-C- -
Polarity Arrangement (Polarity ≈ Boiling Point)

A

R-CONH2 > R-COOH > R-OH > R-CO-R > R-CHO > R-NH2 >
R-CO-OR’ > R-O-R’ > -C≡C- > -C=C- > -C-C-

Amide > Acid > Alcohol > Ketone > Aldehyde > Amine > Ester > Ether > Alkyne > Alkene > Alkane

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44
Q

What are the amino acids found in human protein?

A

NON-ESSENTIAL AMINO ACIDS

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45
Q

It is a neurotransmitter used to regulate reward and pleasure centers of the brain.

A

DOPAMINE

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46
Q

Bacteria used in the production of pickles.

A

LACTIC ACID BACTERIA

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47
Q

They are responsible for the human body’s reaction to chemicals such as adrenaline and serotonin.

A

G-PROTEIN COUPLED RECEPTORS

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48
Q

Chemical process in producing dopamine

A

L-Phenylalanine → L-Tyrosine → L-DOPA → Dopamine

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49
Q

Choose the common methods in the removal of fine particle in hot airstream common in cement production?

A

a. ESP

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50
Q

What is oxygen sag curve?

A

The decrease of dissolved oxygen in a water body after immediate addition of effluent and stabilization of the water body through time.

51
Q

Which of the following persistent organic pollutants is not a component of fertilizer?

A

Chlordane, heptachlor

52
Q

Treatment of municipal wastewater involving bubbling of air

53
Q

DOLOMITE, carbonate water is negligible:

A

ANSWER: at pH 6.6, 0.00327M=[Ca2+]=[Mg2+]
At pH 5 6, 0.0207M=[Ca2+]=[Mg2+]

54
Q

Equivalent absorbed dose, 34eV

A

Ans: 8.7 103 Gy

55
Q

solution of methylamine, CH3NH2, to decompose completely -

56
Q

What is the rate at which mass is lost from the sun -

A

4.3x106 kg/s

57
Q

What were the first elements formed in the early stages of cosmic evolution?

A

HELIUM AND HYDROGEN

58
Q

How much water is in blood?

59
Q

What is the pH of blood?

60
Q

What is the mass ratio of the moon to the earth?

61
Q

What is the volume ratio of the moon to the earth?

62
Q

What is the pH of gastric juice? (Gastric juice is a thin, acidic digestive fluid secreted by glands in the mucous membrane that lines the stomach. It contains, among other substances, hydrochloric acid.

63
Q

What material is found in cold packs?

A

Solid NH4NO3

64
Q

How much Argon is in the air?

65
Q

What is the meaning of LASER?

A

Light
Amplification by
Stimulated
Emission of
Radiation

66
Q

What salts are found in nitrogen fertilizers?

A

NO3- & NH4+

67
Q

It is called the God Particle.

A

HIGGS-BOSON PARTICLE

68
Q

A substance made by combining mercury with other metals.

69
Q

It is a method to detect the age of artifacts from archaeological excavation.

A

RADIOCARBON DATING DISCOVERED BY WILLARD LIBBY

70
Q

It is an allot of bismuth, lead, tin, and cadmium which has a low melting point of 71 degrees Celsius.

A

WOOD’S METAL

71
Q

In addition to carbon dioxide and water, what 6 elements are needed by plants for growth?

A

N, P, K, Mg, Ca, S
NaPaKaMgCaS

72
Q

What is the oxidizing agent and redox product for breathalyzers?

A

K2Cr2O7 – CH3COOH

73
Q

What is the second most abundant cation in the sea?

A

Mg2+ (1.3 g per kg seawater)

74
Q

What poison was used to kill Napoleon Bonaparte?

A

As2O3 poisoning

75
Q

What test is used to detect arsenic?

A

Marsh test

76
Q

Who discovered the positron?

A

CARL ANDERSON

77
Q

Temperature sa MOON?

A

-298F night, 224F day

78
Q

The compound used in the creation of “tabletop volcanoes.”

A

VESUVIAN FIRE (NH4)2Cr2O7

79
Q

It is a miracle material capable of conducting heat and electricity better than any other material.

80
Q

It is the coldest state of matter defying gravity as it flows up instead of down.

A

BOSE-EINSTEIN CONDENSATE

81
Q

The most expensive substance in the world.

A

CALIFORNIUM

82
Q

How much water is in the human body?

83
Q

It is the softest substance. TALC

84
Q

How many Earths can fit in Jupiter?

85
Q

How many Jupiters can fit the Sun?

86
Q

Aside from the Sun, what is the nearest star to the Earth?

A

PROXIMA CENTAURI

87
Q

The most common metal on earth also called the wonder metal.

88
Q

They are the eight noble metals.

A

RHODIUM, RUTHENIUM, IRIDIUM, OSMIUM, GOLD, SILVER, PLATINUM, PALLADIUM

89
Q

It can cut through materials that diamond tips could not.

A

XENON LASERS

90
Q

Metal liquid at room temperature.

91
Q

Metal with the highest melting point.

92
Q

Air becomes liquid at what temperature?

A

-140 degrees Celsius

93
Q

How much salt is in the human body?

94
Q

Phenomenon which naturally produces ozone.

95
Q

Who invented the lighter?

A

J. W. DOBEREINER

96
Q

A large molecule found in wheels of vehicles.

97
Q

It is three times hotter than the sun.

98
Q

Only letter not found in the periodic table.

99
Q

A bee sting is _____. A wasp sting is _____.

A

ACIDIC, BASIC

100
Q

How many ‘lead’ pencils can the carbon in the human body fill?

101
Q

First compound with a noble gas.

102
Q

First person to receive the Nobel prize in Chemistry.

A

HENRY VAN’T HOFF

103
Q

Effect wherein hot water freezes faster than cold water.

A

MPEMBA EFFECT

104
Q

It contains peanuts as an ingredient.

105
Q

Element that does not solidify.

106
Q

Metal that melts at the palm of your hand.

107
Q

The rarest element on earth.

108
Q

How much does water expand upon freezing?

109
Q

molecules are in one drop of water?

110
Q

How many protons would it take to have the same mass as a grain of salt?

A

6x10^21 protons

111
Q

Which is faster: air velocity at night or day?-

112
Q
  1. Which of the following is not dependent on temperature and wavelength? Black Body
113
Q

Polymer for printing and coating -

A

Acrylic and styrene acrylic emulsion polymers

114
Q

UNIFAC method

A

UNIQUAC Functional-group Activity Coefficients

115
Q

SCADA -

A

Supervisory Control and Data Acquisition

116
Q

Which of these industries produces electricity aside from its main product? -

A

sugar industry

117
Q

difference between measured value and set point

118
Q

Yamatake system (process automation):

118
Q

Electronic noise inside an electric conductor which is independent of applied voltage:

A

Johnson noise

119
Q

Age of Earth

A

4.54 billion years old, plus or minus about 50 million years

120
Q

time would elapse before only 11 atoms of bohrium267 remain? -

121
Q

Boron-10, an effective absorber of neutrons -

122
Q

Match the following nuclear reaction.
Artifical Radioactivity = Induced Radioactivity
Hydrogen Fusion Reaction (in Sun) = Natural Radioactivity

PROB SOLVING PBE (11 decks)

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