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Reviewer > GenChem Q3 Quiz1 > Flashcards

GenChem Q3 Quiz1 Flashcards

1
Q

Which of the following explains why water is a universal solvent?
a. Due to the high specific heat of water
b. Due to the strong surface tension of water
c. Due to the cohesiveness and adhesiveness of water molecule
d. Due to its polarity, that allows to dissolve a great number of substances that contain ionized atoms or polar molecules.

A

Due to its polarity, that allows to dissolve a great number of substances that contain ionized atoms or polar molecules.

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2
Q

Which of the following choices would mean interaction between molecules?
a. Coulomb`s Law
b. Electrostatic force
c. Intermolecular force
d. Intramolecular forces

A

Intermolecular force

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3
Q

The strongest interparticle attractions exist between particles of a __________ and the weakest interparticle attractions exist between particles of a __________.
a. solid, liquid
b. solid, gas
c. liquid, gas
d. liquid, solid
e. gas, solid
f. gas, liquid

A

solid, gas

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4
Q

Which of the following compounds has a strong intermolecular force and high viscosity?
a. acetone
b. ethanol
c. glycerol
d. water

A

glycerol

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5
Q

Which from the choices refers to the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C)?
a. cohesion
b. polarity
c. specific heat
d. surface tension

A

specific heat

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6
Q

Which one of the following exhibits dipole-dipole attraction between molecules?
a. XeF4
b. AsH3
c. CO2
d. BCl3
e. Cl2

A

AsH3

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7
Q

True or False. Hydrogen bonding refers to a hydrogen from one molecule bonded to N, F, and Br to the other molecule.

A

False

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8
Q

Which of the following physical property of a liquid allows a spider to float on water?
a. Capillary action
b. Surface tension
c. Vapor pressure
d. Molar heat of vaporization

A

Surface tension

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9
Q

What is the predominant intermolecular force in CBr4?
a. London-dispersion forces
b. ion-dipole attraction
c. ionic bonding
d. dipole-dipole attraction
e. hydrogen-bonding

A

London-dispersion forces

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10
Q

What type of intermolecular force holds the molecules of water together?
a. covalent bond
b. hydrogen bond
c. ion-ion interaction
d. London dispersion force

A

hydrogen bond

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11
Q

True or False. Ion-dipole interaction leads to the building of forces between nonpolar molecules.

A

False

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12
Q

What type of intramolecular force holds the atoms of water together?
a. covalent bond
b. hydrogen bond
c. ion-ion interaction
d. polar covalent bond

A

covalent bond

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13
Q

For which of the following molecules apply dipole-dipole interactions?
a. CH4
b. C6H6
c. CCl4
d. CH2Cl2

A

CH2Cl2

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14
Q

When NaCl dissolves in water, aqueous Na+ and Cl– ions result. The force of attraction that exists between Na+ and water is called a(n) __________ interaction.
a. dipole-dipole
b. ion-ion
c. hydrogen bonding
d. ion-dipole
e. London dispersion force

A

ion-dipole

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15
Q

True or False. According to ion-ion interaction, the electrostatic force increases as the size of the magnitude of charges decreases.

A

False

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16
Q

What do you think is the effect of weak intermolecular forces to the vapor pressure of acetone?
a. low vapor pressure
b. high vapor pressure
c. does not affect at all
d. unstable vapor pressure

A

high vapor pressure

17
Q

Hydrogen bonding is a special case of __________.
a. London-dispersion forces
b. ion-dipole attraction
c. dipole-dipole attractions
d. ion-ion interactions

A

dipole-dipole attractions

18
Q

Rank the following in terms of increasing boiling point:
CaBr2, C2H5OH, C4H10

A

C4H10 < C2H5OH < CaBr2

19
Q

Rank the following in terms of increasing melting point
MgCl2, NaCl, AlCl3

A

NaCl < MgCl2 < AlCl3

20
Q

Why do ice floats on water?
a. Ice is denser than water
b. Ice has a crystalline structure
c. Water is less dense than ice cube
d. Water molecules of ice cube expand that decreases its density

A

Water molecules of ice cube expand that decreases its density

21
Q

Which of the following types of intermolecular forces is the weakest?
a. Dipole-dipole
b. Hydrogen bonding
c. Ion-ion interaction
d. London dispersion

A

London dispersion

22
Q

Which of the following best describes a hydrophobic compound?
a. nonpolar which doesn’t dissolve in water
b. polar molecules and ready to be dissolved in water
c. nonpolar molecules and ready to be dissolved in water
d. polar and ionic molecules and ready to be dissolved in water

A

nonpolar which doesn’t dissolve in water

23
Q

True or False. Dipole-dipole interaction is significant between an dipole and a dipole molecule.

A

True

24
Q

Which of these molecules will NOT form hydrogen bonds with water?
a. hydrogen fluoride
b. methane gas
c. ammonia
d. methanoic acid

A

methane gas

25
Q

Which of the following choices is used to explain the behavior of states of matter from a microscopic point of view?
a. Atomic Theory
b. Coulomb`s Law
c. Kinetic Molecular Theory
d. Intramolecular forces

A

Kinetic Molecular Theory

26
Q

Rank these substances from lowest to highest intermolecular forces
HF, F2, PCl3

A

F2 < PCl3 < HF

27
Q

When water is poured into a test tube, a concave surface is usually observed. Why do you think this happens?
a. Because water molecules touching the glass adhere less to the test tube.
b. Because water molecules touching the glass adhere more to the test tube.
c. Because water molecules touching the glass adhere more to other water molecules.
d. Because water molecules touching the glass did not get attracted to the wall of the test tube.

A

Because water molecules touching the glass adhere more to the test tube.

28
Q

Which of the intermolecular forces exists between molecules of iodine gas?
a. Dipole-dipole
b. Hydrogen bonding
c. Ion-ion interaction
d. London dispersion

A

London dispersion

29
Q

Of the following substances, only __________ has London dispersion forces as its only intermolecular force.
a. CH3OH
b. NH3
c. H2S
d. CH4
e. HCl

A

CH4

30
Q

True or False. London dispersion is evident in nonpolar molecules.

A

True

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