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CHELE 2024 > DAY 1 > Flashcards

DAY 1 Flashcards

1
Q

Materials to impede radiation by alpha particles

A

Any material

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2
Q

Materials to impede radiation by beta particles

A

0.25 cm aluminum

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3
Q

Materials to impede radiation by strong beta particles

A

6-12 mm of Lucite of Plexiglass

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4
Q

Materials to impede radiation by fast neutrons

A

Water, paraffin, and concrete

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5
Q

Material to impede radiation by slow neutrons

A

Cadmium

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6
Q

Materials to impede radiation by gamma particles

A

Thick layer of lead

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7
Q

Distance from Earth to most remote known quasar

A

1.4x10^26

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8
Q

Distance from Earth to most remote known normal galaxy

A

9x10^25

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9
Q

Distance from the Earth to most remote known normal galaxies

A

2x10^22

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10
Q

Distance from the Sun to nearest star (Proxima Centauri)

A

4x10^16

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11
Q

One light year

A

9.46x10^15

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12
Q

Mean orbit radius of the earth about the Sun

A

1.5x10^11

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13
Q

Mean distance from Earth to the Moon

A

3.84x10^8

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14
Q

Distance from the equator to the North Pole

A

1.00x10^7

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15
Q

Mean radius of the earth

A

6.37x10^6

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16
Q

Typical altitude (above the surface) of the satellite orbiting the Earth

A

2x10^5

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17
Q

Length of a football field

A

9.1 x 10^1

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18
Q

Length of a housefly

A

5x10^-3

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19
Q

Size f the smallest dust particles

A

~10^-4

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20
Q

Size of cells of most living organisms

A

~10^-5

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21
Q

Diameter of a hydrogen atom

A

~10^-10

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22
Q

Diameter of an atomic nucleus

A

~10^-14

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23
Q

Diameter of a proton

A

~10^-15

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24
Q

Dictates that the amount of energy that a system may possess is limitless

A

Classical Physics

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25
Q

Who discovered Helium

A

Ramsay and Travers

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26
Q

What compound if dehydrated forms water?

A

Propene

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27
Q

How do two free radicals react when they encounter each other?

A

they unite with covalent bond formation

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28
Q

What are sigmatropic rearrangements in organic reactions?

A

They are different from electrolytic reactions wherein movement of a sigma bond with a simultaneous rearrangement of the pi-system does not occur.

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29
Q

How many different tetra-peptides can be made (a) if the peptides contain the residues of asparagine, proline, serine, and methionine and (b) if all 20 amino acids can be used?

A

256 and 160, 000

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30
Q

What is the most oxidized form of nitrogen-fixing bacteria?

A

Nitrate

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31
Q

How to differentiate alkane, alkene, and alkyne?

A

Reaction with Br2

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32
Q

A 1-kg copper bar (coefficient of linear expansion = 17x10^6/degC) is heated at atmospheric pressure from 20 to 50 deg C. What is the change in internal energy (kJ) of the bar? What is the work kJ) of the bar?

A

11.6, -17.36 kJ

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33
Q

Which of the following lipid contain a ceramide unit?

A

Sphingomyelins

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34
Q

Which of the following acid group is present in taurine?

A

Sulfonic acid

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35
Q

Most penetrating radiation

A

Gamma ray

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36
Q

Most abundant metal element in human body

A

Calcium

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37
Q

What happens to the pH of the soda when can was opened?

A

Increases

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38
Q

FOMO and SOMO Molecular Orbital Theory was published by

A

Kenichi Fuqui

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39
Q

What will be released when dopamine level was increased?

A

Tyrosine and phenylalanine

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40
Q

A balloon filled with gas is placed in liquid nitrogen. Relating to gas laws, what will happen?

A

Lower pressure

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41
Q

Ka pag may electric discharge, yung mercury vapor ay nagccombine saan?

A

Krypton, Argon, Neon

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42
Q

Magic Numbers

A

2, 8, 20, 28, 50,82, 126

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43
Q

Resistance to breakage

A

tensile strength

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44
Q

Definition of protein

A

Polypeptides with >51 amino acids, with 10000 amu

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45
Q

Most important property of alkanes

A

Complete lack of polarity

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46
Q

How many hydrogen bonds does uracil and adenine have?

A

2 HB

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47
Q

Cerebrosides belong to

A

Sphingolipids

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48
Q

Chymotrypsin amino acid sequence

A

Tryptophan, Tyrosine, Phenylalanine, or Leucine

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49
Q

Nucleophile of chymotrypsin

A

Serine

50
Q

Formula of Alar

A

C6H12N2O3

51
Q

Author of Octet Rule

A

Gilbert Lewis

52
Q

Adolf Bayer’s contribution in medicine, made by reacting malonic acid and urea with a catalyst is called

A

Barbituric acid

53
Q

An organic reaction where the unsaturated bonds of alkanes, alkynes or ado compounds are cleaved with ozone

A

Ozonolysis

54
Q

Developed by Pehr Edman, is a method of sequencing amino acids in a peptide

A

Edman degradation

55
Q

What is the other name for bulk temperature?

A

Mixing cup temperature

56
Q

Common method for the removal of fine particles in hot airstream common in cement production

A

ESP

57
Q

PRC Modernization Act

A

RA 8981

58
Q

Liquid nitrogen is placed in an Erlenmeyer flask. Hard boiled egg is then placed on top of the opening, what will happen?

A

Egg will be sucked in

59
Q

Ketone and aldehyde in alcohol will form

A

Ketals and acetals

60
Q

What is the first step in utilizing proteins

A

Hydrolysis

61
Q

The rate of nucleophilic substitution action of tertiary-butyl bromide with OH- is found to be independent of the concentration of OH- at any instant. It can be inferred that the reaction is

A

First-order (SN1)

62
Q

Trimethyl-n-proplyammonium is heated with KOH to yield N,N,N-trimethylamine and

A

Propene

63
Q

Reduction of ethyl cinnamate using LiAlH4 produces the alcohol:

A

3-phenylprop-2-en-1-ol

64
Q

Styrene undergoes ozonolysis to yield two carbonyl compounds. Which of the following pairs is produced by this reaction?

A

Benzaldehyde and formaldehyde

65
Q

In which reaction of alkyl can keto-enol tautomerism exist?

A

Ozonolysis

66
Q

Chylomicrons are synthesized in

A

Intestine

67
Q

Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

A

Four isoprene units

68
Q

Reaction of benzene with chloride gas to produce trichlorobenzene exemplifies a/an ___ reaction.

A

Series

69
Q

In the normal breakdown of phenylalanine, it is initially degraded to

A

Tyrosine

70
Q

Which of the following amino acids can form hydrogen bonds with their side (R) groups?

A

All of these ( Asparagine, Aspartic acid, Glutamine)

71
Q

What is the product when alpha-amylase acts in amylase?

A

Different sized oligosaccharide fragments

72
Q

Diabetic patients are found to have an increased ketone concentration in their bodies. What causes this?

A

Acetoacetic acid/Ketone

73
Q

What is the product of the oxidation of dopamine?

A

R-Epinephrine

74
Q

What is the role of Ca ions as a signaling agent in synapse?

A

Sparks or Puffs

75
Q

Which of the following amino acids is the disruptor or breaker of secondary structures?

A

Proline and glycine

76
Q

A heterocyclic compound has a non-carbon member in the ring.. Which of the following is heterocyclic?

A

Furan and Pyran

77
Q

3 moles of glucose processes how many moles of lactate?

A

6 moles

78
Q

What is the smallest unit that retains the physical properties?

A

Atom

79
Q

Alkali metals

A

Have low boiling points

80
Q

Which of the following devices is/are sensitive enough to measure the intensity of ionizing radiation?

A

Geiger Counter and Scintillation Counter

81
Q

Which has the higher melting point: (a) a triglyceride containing only Laurie acid and glycol or (b) a triglyceride containing only stearic acid and glycerol?

A

Stearic acid

82
Q

Monosaccharides are colorless, srystalline solids, and are very soluble in water. Why?

A

True, because of their polar hydroxyl groups

83
Q

Adenosine triphosphate, when acted with adenylate Cyclades, produces

A

Cyclic adenosine monophosphate and pyrosphate

84
Q

Suppose that the yield of aspirin is 75%. How many grams of salicylic acid would be required to give an actual yield of 25 g of aspirin?

A

25 g

85
Q

Rank the toxicities in terms of the first three most toxic for the following toxic compounds: DDT, Dieldrin, Arsenic, Heptachlor, and Chromium

A

By ingestion: Dieldrin>Heptachlor>Arsenic>DDT>Chromium
By inhalation: Chromium>Dieldrin>Arsenic>Heptachlor>DDT

86
Q

What is the oxidation number of Cr in the complex ion CrG6 F-ligand?

A

3

87
Q

An Erlenmeyer flask has an egg on its beak and is put to a bath of liquid nitrogen. What happens to its pressure?

A

Decreases

88
Q

Which temperature scale is defined as a fraction of the triple point of water?

A

Kelvin

89
Q

A substance solid/liquid is left at room temperature. What describes the process? What is the melting point?

A

Delta G = 0

90
Q

An ideal gas undergoes a constant pressure expansion until it reaches an initial temperature of 300 K. Then it undergoes a constant volume cooling where its pressure is reduced to 1/4. Calculate the work done.

A

-1.87 kJ

91
Q

What is the main purpose of Joule-Thomson Effect?

A

Cooling

92
Q

For an ideal gas mixture at constant temperature and pressure, the fugacity _____ with increase in mole fraction

A

Increases

93
Q

Who invented photosynthesis?

A

Melvin Calvin

94
Q

Proposed the theory of chemical valencies. Introduced the concept of combining power or valence.

A

Sir Edward Frankland

95
Q

In which layer of the atmosphere is ozone found?

A

Stratosphere

96
Q

A buckyball is a

A

Fullerene

97
Q

What changes color when it reacts with acid or base?

A

Indicator

98
Q

Define ozonolysis

A

Reaction of ozone followed by the reduction of the presence of zinc and water.

99
Q

A compound given its molecular formula is oxidized with potassium dichromate in the presence of acid. What is the product?

A

Aldehyde

100
Q

Which process uses air to convert harmful compounds in wastewater into less harmful and stable products?

A

Aeration

101
Q

For a biochemical study involving the tigers at Malabon Zoo, a fatty acid was labeled with Carbon-14. The sample was then fed to the tigers and after a few hours the tigers breath was analyzed. In which among the following compounds would you expect for the radioactive material to be detected?

A

As carbon dioxide

102
Q

Determine the percent atom recovery of the Raschig Process.

A

17.30%

103
Q

Raschig Process

A

2 C6H6 + 2 HCl + O2 —> 2 H2O + 2 C6H5Cl

104
Q

Which of the following radioactive mudslide is often bombarded with the various isotopes of lead in order to produce most of the new super heavy elements?

A

Calcium-48 and Nickel-64

105
Q

Determine the uncertainty in positron of a proton that moves at 1/10 the velocity of light. Assume the velocity is measured with a precision of 1%.

A

1x10^-13 m

106
Q

What is the color of the light of a 75-watt light source that was able to emit 9.91x10^20 photons of a monochromatic radiation for 5.0 s?

A

Green

107
Q

What color of the light is at 4x10^-7?

A

Violet

108
Q

What is the color of the light at 5x10^-7?

A

Green

109
Q

What is the color of the light at 6x10^-7?

A

Orange

110
Q

What is the color of the light at 7x10^-7?

A

Red

111
Q

Default activity of Carbon-14

A

15.3 dis/min

112
Q

Two beakers containing sulfuric acid and phosphoric acid separately was neutralized by the same base. Equal amounts of the alkali was used for the neutralization reaction and it produced sulfate ions and di hydrogen phosphate ions, what is the mass ratio of sulfuric acid to phosphoric acid that was originally present in the beakers?

A

1/2

113
Q

When steam condenses into water at 90 dec C, the entropy of the system decreases. What must be true if the second law of thermodynamics is to be satisfied?

A

Entropy of the surrounding increases to a greater extent than the decrease in the entropy of the system.

114
Q

When benzene and naphthalene is mixed in a single container at room temperature, an ideal solution will be formed. Which among the following expressions does NOT describe the aforementioned process?

A

Delta G > 0

115
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 1m. The hydraulic conductivity is 7.5 x 10^-10 m/s. Assume that the head of water is 0.6 m.

A

6.75 x 10^-5 m^3/s

116
Q

A sculptor was hired by a firm in BGC to create an ice sculpture of their logo within two days for thei 50th anniversary. Given the time constraint, the sculptor needs to soften the ice in certain spots immediately. Which among the following salts should the sculptor use for this task to efficiently make use of his time?

A

CaCl2

117
Q

Consider: Cerargyrite
Is it soluble in H2O
Is it soluble in Hexane?
Is it triclinic?
Is it vapor at 1600 deg C?

A

No
No
No
Yes

118
Q

When 2,3-dimethyl-2-butanol is treated with phosphoric acid at 120 deg Celsius, which among the following is the major product?

A

2,3-dimethyl-2-butene

119
Q

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 mic, 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

Hint: I(D)^2

120
Q

Heisenberg’s Uncertainty Principle

A

Δx(Δp) = h/4pi

Δx(m) (Δv) = h/4pi

CHELE 2024 (1 decks)

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