set c Flashcards

1
Q

To verify whether is safe to consume, the water must comply with the PNSDW< which stands for:

  • Philippine National Security of Drinking Water
  • Philippine Natural Standard for Drinking Water
  • Philippine National Standard for Drinking Water
  • Potable Natural Standard for Drinking Water
A

Philippine National Standard for Drinking Water

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2
Q

The prohibition of production and use of CFCs and its products was done by different countries as a response to the:

  • Stockholm Convention
  • Kyoto Protocol
  • Basel Convention
  • Montreal Protocol
A

Montreal Protocol

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3
Q

Removal of suspended solids present in wastewater from a blast furnace gas cooling and cleaning plant is done by:

  • Rotary Biological Contractors
  • Bag Filters
  • Trickling Filter
  • Setting Tank
A

Trickling Filter

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4
Q

The fishy odor in wastewater indicates the presence of

  • Hydrogen Sulfide
  • Amines
  • Skatole
  • Mercaptans
A

Amines

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5
Q

According to DAO 34, water supply that requires complete treatment comply with the PNSDW in classified under:

  • Class AA
  • Class A
  • Class B
  • Class C
A

Class A

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6
Q

What does a negative value for standard enthalpy of reaction (delta Hrxn) mean?

  • Spontaneous reaction
  • Exothermic process; heat is released
  • Endothermic process; heat is released
  • Nonspontaneous reaction
  • Exothermic process; heat is absorbed
A

Exothermic process; heat is released

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7
Q

A definition of the third law of thermodynamics is that

  • the total mass o f the universe is constant.
  • the combined mass and energy of the universe is decreasing.
  • a perfect crystal of any substance at 0 K has a minimum entropy.
  • in a spontaneous process, the entropy of the universe increases.
  • the total energy of the universe is constant.
A

a perfect crystal of any substance at 0 K has a minimum entropy.

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8
Q

The octane number of a commercial gasoline is

  • related to its auto-ignition temperature.
  • always lower than that for 2,2,4-trimethylpentane.
  • always higher than that for heptane.
  • a measure of its ability to burn smoothly in an internal combustion engine.
  • all of these choices
A

all of these choices

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9
Q

What is the correct name of N2O5?

A

Dinitrogen pentoxide

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10
Q

Which component o the following cell notation is the anode?

K | L || M | N

A

K

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11
Q

A system that does no work but which receives heat from the surroundings has

  • q < 0, delta E > 0
  • q = delta E
  • q > 0, delta E < 0
  • q = - delta E
A

q = delta E

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12
Q

If you have 2-methyl-2-butene, what process will you employ to produce’ secondary alcohol?

  • hydroboration-oxidation
  • ozonolysis
  • addition of bromine water
  • acid-catalyzed hydration
A

hydroboration-oxidation

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13
Q

Coulomb’s Law states that as the charge on the cation and anion decreases, the force (and potential energy) of the system _____.

  • decreases
  • cannot be determined
  • remains the same
  • it will be unstable
  • increases
A

decreases

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14
Q

We were asked to analyze the trace composition of the pigments used in paint. XRF is superior to AAS for this purpose because

a. XRF is a non-destructive technique
b. XRF is capable of measuring multiple elements simultaneously
c. AAS is only used for molecular analysis
d. both a and b
e. none of the choices

A

both a and b

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15
Q

The fission reaction exploited in nuclear power stations involves

  • neutron bombardment of uranium-235
  • neutron bombardment of uranium-238
  • neutron bombardment of plutonium-239
  • x-ray irradiation of plutonium-241
  • x-ray irradiation of uranium-235
A

neutron bombardment of uranium-235

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16
Q

Assuming the orbitals of two atoms overlap and interact with constructive interference, what is the resulting increase in wave density?

  • bonding molecular orbital
  • anion formation
  • free radical formation
  • cation formation
  • antibonding molecular orbital
A

bonding molecular orbital

17
Q

If you were to heat pentanoic acid and 2-butanol with a catalytic amount of strong acid, what do you get?

  • Alkane
  • Ketone
  • Ester
  • Amine
  • Aldehyde
A

Ester

18
Q

Which of the following will yield a carboxylic acid upon oxidation?

  • 2 alcohol
  • aldehyde
  • 3 alcohol
  • cycloalkane
  • ketone
A

aldehyde

19
Q

What is the best way to ensure complete precipitation of SnS from a saturated H2S solution?

  • Add a strong base
  • Add a more H2S
  • Add a weak acid
  • Add a weak base
  • Add a strong acid
A

Add a strong base

20
Q

Polymers when heated produce bonds between carbon atoms on separate strands. What do you call the resulting product?

  • ring polymers
  • cross-linked
  • wired polymers
  • fullerized polymers
  • thermoplastics
A

cross-linked (covalent bonds)

21
Q

It yields a primary alcohol upon reduction.

  • Amine
  • Aldehyde
  • Ether
  • Alkene
  • Ketone
A

Aldehyde

22
Q

Select among the pair of atoms that release the most energy during the formation of an ion pair if the combined radii of each pair are assumed equal.

  • Na and Br
  • Rb and F
  • H and F
  • K and O
  • Al and S
A

Al and S

23
Q

From the statements below, describe the combustion of glucose.

  • non-spontaneous at all temperatures
  • spontaneous at all temperatures
  • non-spontaneous towards lower temperature
  • spontaneous towards higher temperature
  • cannot be determined
A

spontaneous at all temperatures

24
Q

From the given electron configurations of an atom, which is most likely to be involved in a covalent bond?

a. 1s2 2s2 2p6 3s2
b. 1s2 2s2 2p6
c. 1s2 2s2 2p6 3s2 3p6
d. 1s2 2s2 2p6 3s2 3p3
e. cannot be determined

A

1s2 2s2 2p6 3s2 3p3

25
Q

Determine the hybridization around the central atom in KrF4

a. sp3d2
b. sp3d
c. sp3
d. sp2
e. sp

A

sp3d2