1. DAY 1 PBE Flashcards by Deleted Deleted

Determine whether TRUE or FALSE about constitutional isomer.
1. They have the same molecular formula
2. They have the same molecular weight
3. They have the same connectivity to their atoms
4. They have the same physical properties

T, T, F, F

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A certain solid compound was tested in a laboratory and was anakyzed to contain 6.5% hydrogen, 42.2% carbon, and 5.5% oxygen with a mo

C12

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In the study of fats and lioids, determine which of the two triglycerides has a higher melting point: substance A - containing only lauric acid and glycerol, or substance B - containing only strearic acid and glycerol.
A. Both have the same melting points
B. B
C. A
D. None of these

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When a can of soda is opened and CO2 is released tot he atmosphere, what is the resultant pH of the soda?
A. Decreases
B. Increases
C. The same
D. All of these

B. Increase

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Biochemical compounds are either hydropholic, hydrophobic, or amphipathic. Classify the following: glucose, stearic acid, soaps, fatty acids

Hydrophilic, hydrophobic, amphipatic, hydrophobic

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The two most common components of acid rain are:

Nitric and sulfuric acid

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Which element is difficult to remove from sewage and wastewater and at the same time, it contributes to bacterial and algae overgrowth in freshwater?

Nitrogen

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Which of the following is true about the closest packing of atoms?
A. Tetrahedral voids are larger than octahedral voids
B. Tetrahedral voids are smaller than octahedral voids
C. Tetrahedral voids have same sizes as octahedral voids
D. None of these

B. Tetrahedral voids are smaller than octahedral voids

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What are the types of radioactive decay?

Alpha, Beta, Gamma, Positron, Electron Capture (k capture)

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In periodic table, which of the following is group considered a radioactive?
A. Above 75
B. Above 83
C. Above 115
D. Between 80-100

B. Above 83

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Chymotrsin is used for following protein as shown:
Met - Tyr - Leu - Trp - Gly - Phe - Ser
How many peptides can be formed after hydrolysis?
A. 3
B. 4
C. 5
D. 6

B. 4

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Which of the following is ceramids?
A. Sphingosine
B. Sphingolipids, sphingosine, and sphingosine cerebrosides
C. Sphingosine cerebrosides
D. Sphingolipids

A. Sphingosine

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Alkyl halide reacts with a hydroxide to form what compound?
A. Alcohol
B. Alkene
C. Alkyne
D. Alkane

A. Alcohol

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What is the type of isomerism of cis-1, 4-cuclohexanol and trans-1, 2-cyclohexanol?
A. Constitutionals isomer
B. Stereoisomer
C. Both a and b
D. None of these

A. Constitutionals isomer

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What is the chemical formula of caffeine?

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There are 4 beakers, online with CCl4, one with dry ice, one exposed to air, and one with water. Which will get heated inside a microwave oven?
A. CCl4
B. Dry ice
C. Air
D. Water

D. Water

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Hydrazine reacts with dinitrogen tetroxide to form nitrogen gas. How many kg of nitrogen gas can be formed from 200 kg of hydrazine?
A. 131
B. 262
C. 29.1
D. 65.6

262

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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.

1.7

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A well-mixed sewage lagoon (a shallow pond) is receiving 430 m3 · d−1 of untreated sewage. The lagoon has a surface area of 10 ha (hectares) and a depth of 1.0 m. The pollutant concentration in the raw sewage discharging into the lagoon is 180 mg · L−1. The organic matter in the sewage degrades biologically (decays) in the lagoon according to first-order kinetics. The reaction rate constant (decay coefficient) is 0.70 d−1. Assuming no other water losses or gains (evaporation, seepage, or rainfall) and that the lagoon is completely mixed, find the steady-state concentration of the pollutant in the lagoon effluent.

1.10 mg · L−1

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A tank is half filled with water, if N2 =1.02 moles and H20 =1.02 moles. What happens to the N2 when dissolved in water?
a. increase
b. decrease
c. remains the same
d. none of these

c. remains the same

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Description of a primary and a secondary cell

A primary cell cannot be recharged while secondary can, Ni-Cd is a primary cell, a dry cell is a secondary cell.

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This states that “The state shall recognize and protect the rights of the indigenous cultural communities to their ancentral lands as provided by the constitution.”

Philippine Mining Act

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What is the simplest type of control commonly expressed as having on/off position action?

a. Integral c. Bang Bang
b. Manual d. Input-Output

c. Bang Bang

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Product of distillation of coal tar

phenol

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Example of pseudo plastic fluid a. apple sauce b. rubber latex c. tap water d. sewage sludge

a. apple sauce

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

b. kinetic and potential energy

Another name of Taurine.

Aminoethanesulfonate or 2-aminoethanesulfonic acid

Who discovered zeolite?

Rober Gans

Also known as earthwax?

Ozocerite

____ is nonporous rock containing kerogen.

Oil Shale

Element used in standard 1 kg measurement?

Iridium

What is the third law of thermodynamics? .

The third law of thermodynamics states that the entropy of a system approaches a constant value as the temperature approaches absolute zero

The position and the velocity of an object (particles, atom) cannot both be measured exactly, at the same time, even in theory.

Heisenberg Uncertainty Principle

What is the sign convention of enthalpy during endothermic reaction?

positive

One way of obtaining IR spectra of solids is

Nojul Mull process

3. Can oxygen be synthesized from nitrogen? a. Yes, by the bombardment of alpha particles b. Yes, by electron capture c. Impossible

a. Yes, by the bombardment of alpha particles

22. What happens to the melting point of a saturated fatty acid if -CH2- increase? a. increase b. decrease c. the same d. none of these

a. increase

Arrange in increasing toxicity level: DDT, heptachlor, arsenic, dieldrum , Cr

heptachlor , dieldrum , Cr, DDT, arsenic

Formic acid (HCOOH; structural formula shown below) is secreted by certain species of ants when they bite. Rank the relative strengths of the H-C and O-H bonds. Explain these rankings.

We need to compare the strength of a single bond between C and H and C and O. The oxygen atom is smaller than the hydrogen atom. With the increase of the atom radius, the bond length increases as well. Since the nucleus less strongly attracts the bonding electrons as the bond length increases, the C − −H bond will be easier to break. Therefore: C−O > C−H

What is the maximum mass of crude fluorite ore, in metric tons of fluorine if the ore contains 70% calcium fluoride? A. 7.2 B. 1.9 C. 6.8 D. 7.8

7.2

pKa of chloroacetic acid

2.85

Ethylene glycol (EG) is a common automobile antifreeze. It is water soluble and fairly nonvolatile (b.p 197C). Calculate the boiling point elevation and freezing point depression of a solution containing 651 g of this substance in 2505 g of water

Tb = 2.144C Tf = 7.788C

A solution of HCl and a monobaric acid is titrated with NaOH. If the initila volume of the solution is 100 mL and the consideration of each moment is 0.011 M and the ionization constant is 1.01x10^5 and the concentration of the titrant base is 0.1M, estimate the pH and the optimum pKa of a weak acid indicator to allow determination of the HCl present

2.3, 5.0, 3.5

An experimental electric jeep running in Makati on 12V battery at 20 m/s has a total energy storage of 2.0x10^7 Joules. If 8A kW is needed to move through vehicle, what is the quantity of energy supplied to the motor and how far will it travel?

667 A, 50 km

A sample of chromite is analysed to contain 30% CrO3

2.378

Characteristics of elements under group 1A

Has 1 electron on its outer most energy level

Description of a primary and a secondary cell

Primary batteries are “single use” and cannot be recharged. Dry cells and (most) alkaline batteries are examples of primary batteries. The second type is rechargeable and is called a secondary battery

Which of the following has a higher heat of combustion on a gram per gram basis if Hf is 237 kj/mol and 532 kj/mol for methane and propane respectively?

methane

Particle with the same mass as proton

neutron

Arrange in increasing level of toxicity 1: heptachlor 2: dieldrum 3: DDT 4: Arsenic 5: Cr

ESP /

Choose the common methods in the removal of fine particle in hot airstream common in cement production? a)ESP b)Bouyancy c)Cyclone d)Venturi Scrubber

a bond in which electrons are shared between the elements having a difference in electronegativity of between 0.5 to ~2.0

polar covalent bond

Metabolic pathways that break down molecules, releasing energy.

Catabolism

Metabolic pathways that construct molecules, requiring energy.

Anabolism

PRC Modernization Act of 2000

RA 8981

How do you differentiate electromagnetic radiation

Wavelength

Functional groups in thiotic acid

carboxylic group

specific groups of atoms or bonds within molecules that are responsible for the characteristic chemical reactions of those molecules

functional group

In stem cell studies, a chemical known as telomeres is attached to the chromosome to promote longer life. How would you apply this as a chemical engineer in the field of agriculture and food?

Genetically enhance plants to prolong shelf life

What is the first step in utilizing proteins?

Hydrolysis

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

Egg will be sucked in

You are an environmental engineer sent to a place with the cholera epidemic, what the best thing to do?

Treat water supply

are small DNA molecules within a cell that are physically separated from a chromosomal DNA and can replicate independently

plasmids

What is the chemical used in sunblock?

ZnO

Ketone and aldehyde in alcohol will form?

Acetals/Ketals

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

They unite with covalent bond formation

Acetylcholine is destroyed by an enzyme, acetylcholinesterase, into choline and acetic acid

Hydrolysis of acetylcholine

Number of acetic acid formed by complete beta oxidation of n-octane

Zero

Nucleophile of chymotrypsin reaction

Serine

Amino acid sequence can exist at pH 9.5 but not in pH 7

lysine, histidine, arginine

Which of the ff doesn't have chiral center or cis-trans 3-methylcyclohexanol 1-methylcycohexanol Cis-4-methylcyclohexanol Trans-4-methylcyclohexanol

1-methylcycohexanol

Value of plancks constant

6.62607015×10−34 J⋅s

Pollutant produced from coal and petroleum

CO2,CO,NOx

Which is nuclear fusion A. the big bang B. the radiant energy from sun C. the formation of deuterium/tritium

the radiant energy from sun

Instrument in measuring Radiation

Geiger Counter and Chamber

Notation on alkane containing Cl

chloro

Particle with the same mass of proton?

Neutron

When will a pine tree grow in Alaska? o Not in a million years o It depends on the carbon dioxide o Greenhouse effect o All of the above.

What compound is a ketone but is not a carbohydrate but is useful commercially?

acetone

Most negative ion

F-

Where is water quality critical? o Water infused with product o Water used in the industry

water infused with product

a signal f(t) that, when input into the system, produces a response y(t) = λf(t), where λ is a complex scalar eigenvalue

Eigenfunction

Element used in standard 1 kg measurement

Iridium

Lee-Kesler is applicable fo

Nonploar, slightly polar and high density gas

Example of shear thickening

Sand

What is the most common contaminant in the BTEx proccess?

Benzene, ethylbenzene, toluene and three isomers of xylene.

What is the other name of bulk temperature?

Mixing-cup temperature

Definition of polar covalent bond. A. Unbalanced electron with unequal sharing of electrons; b. bonding of heteronucleus with unequal sharing of electrons

The range of melting point of the fatty acids.

Saturated: -100 to 110 ; unsaturated: -70 to 85

- fertilizer for fruits

C6H12N2O3 - Daminozide

What protein is capable of undergoing a reduction process?

Cysteine

Process that powers the sun and stars. Two atoms of hydrogen combine together, or fuse, to form an atom of helium.

Fusion:

At a constant temperature, the amount of a given gas dissolved in a given type and volume of a liquid is directly proportional to the partial pressure of the gas in equilibrium with that liquid

Henry’s law

SCADA -

Supervisory Control and Data Acquisition

Which of these industries produce electricity aside from its main products?

Sugar industry

Property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously.

Radioactivity

_____ is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground level ozone

Photochemical smog

Capsaicin is measured on the _______ and expressed in terms of ________

scoville scale scoville heat units