chemistry test

Question 1

True or False: The Kinetic-Molecular Theory is used to determine the pressures of individual gases in gas mixtures.

Answer 1

False: That is Dalton’s law

Question 2

True or False: Graham’s law is used to compare the diffusion rates of 2 gases.

Answer 2

True

Question 3

True or False: Intramolecular forces are stronger than intermolecular forces

Answer 3

True

Question 4

True or False: Intermolecular forces are stronger than intramolecular forces

Answer 4

False

Question 5

True or False: Dispersion forces are intermolecular forces between temporary dipoles

Answer 5

True

Question 6

True or False: Dipole-dipole occurs between non polar molecules

Answer 6

False; it occurs between polar molecules

Question 7

True or False: The kinetic-molecular theory explains the behavior of solids and liquids

Answer 7

True

Question 8

True or False: Intramolecular forces in liquids affect viscosity, surface tension, cohesion, and adhesion.

Answer 8

False; intermolecular forces

Question 9

True or False: Crystalline solids can be classified by their shape and composition

Answer 9

True

Question 10

States of a substance can be referred to as phases when they coexist as physically distinct parts of a mixture

Answer 10

True

Question 11

Energy changes occur during phase changes

Answer 11

True

Question 12

Phase diagrams do not show how different temperatures and pressures affect the phase of a substance

Answer 12

False; they do show

Question 13

Boyle’s law states that the pressure of a fixed amount of gas is directly proportional to its kelvin temperature at constant volume

Answer 13

False

Question 14

Charles’s law states that the volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature

Answer 14

False

Question 15

Gay Lussac’s law states that the volume of a fixed amount of gas is directly proportional to its kelvin temperature at constant pressure.

Answer 15

False

Question 16

The ideal gas law relates cant be used to find molar mass if the mass of the gas is known, or the density of the gas, if its molar mass is known

Answer 16

False

Question 17

At very high pressures and very low temperatures, real gases behave differently than ideal gases

Answer 17

True

Question 18

The individual substances in a heterogeneous mixture don’t remain distinct

Answer 18

False; they do

Question 19

two types of heterogeneous mixtures are suspensions and colloids

Answer 19

true

Question 20

Henry’s law states that at a given temperature, the solubility (S) of a gas in a liquid is directly proportional to the pressure (P) of the gas above the liquid.

Answer 20

true

Question 21

Nonvolatile solutes increase the vapor pressure of a solution

Answer 21

false; they lower

Question 22

A solution’s freezing point depression is always lower than that of the pure solvent.

Answer 22

true

Question 23

osmotic pressure depends on the number of solute particles in a given volume.

Answer 23

true