GenChem Q3 Quiz1

Question 1

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.

Answer 1

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

Question 2

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

Answer 2

Intermolecular force

Question 3

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

Answer 3

solid, gas

Question 4

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

Answer 4

glycerol

Question 5

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

Answer 5

specific heat

Question 6

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

Answer 6

AsH3

Question 7

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

Answer 7

False

Question 8

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

Answer 8

Surface tension

Question 9

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

Answer 9

London-dispersion forces

Question 10

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

Answer 10

hydrogen bond

Question 11

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

Answer 11

False

Question 12

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

Answer 12

covalent bond

Question 13

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

Answer 13

CH2Cl2

Question 14

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

Answer 14

ion-dipole

Question 15

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

Answer 15

False

Question 16

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

Answer 16

high vapor pressure

Question 17

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

Answer 17

dipole-dipole attractions

Question 18

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

Answer 18

C4H10 < C2H5OH < CaBr2

Question 19

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

Answer 19

NaCl < MgCl2 < AlCl3

Question 20

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

Answer 20

Water molecules of ice cube expand that decreases its density

Question 21

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

Answer 21

London dispersion

Question 22

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

Answer 22

nonpolar which doesn’t dissolve in water

Question 23

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

Answer 23

True

Question 24

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

Answer 24

methane gas

Question 25

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

Answer 25

Kinetic Molecular Theory

Question 26

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

Answer 26

F2 < PCl3 < HF

Question 27

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.

Answer 27

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

Question 28

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

Answer 28

London dispersion

Question 29

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

Answer 29

CH4

Question 30

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

Answer 30

True