chemistry test Flashcards
True or False: The Kinetic-Molecular Theory is used to determine the pressures of individual gases in gas mixtures.
False: That is Dalton’s law
True or False: Graham’s law is used to compare the diffusion rates of 2 gases.
True
True or False: Intramolecular forces are stronger than intermolecular forces
True
True or False: Intermolecular forces are stronger than intramolecular forces
False
True or False: Dispersion forces are intermolecular forces between temporary dipoles
True
True or False: Dipole-dipole occurs between non polar molecules
False; it occurs between polar molecules
True or False: The kinetic-molecular theory explains the behavior of solids and liquids
True
True or False: Intramolecular forces in liquids affect viscosity, surface tension, cohesion, and adhesion.
False; intermolecular forces
True or False: Crystalline solids can be classified by their shape and composition
True
States of a substance can be referred to as phases when they coexist as physically distinct parts of a mixture
True
Energy changes occur during phase changes
True
Phase diagrams do not show how different temperatures and pressures affect the phase of a substance
False; they do show
Boyle’s law states that the pressure of a fixed amount of gas is directly proportional to its kelvin temperature at constant volume
False
Charles’s law states that the volume of a fixed amount of gas is inversely proportional to its pressure at constant temperature
False
Gay Lussac’s law states that the volume of a fixed amount of gas is directly proportional to its kelvin temperature at constant pressure.
False
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
False
At very high pressures and very low temperatures, real gases behave differently than ideal gases
True
The individual substances in a heterogeneous mixture don’t remain distinct
False; they do
two types of heterogeneous mixtures are suspensions and colloids
true
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.
true
Nonvolatile solutes increase the vapor pressure of a solution
false; they lower
A solution’s freezing point depression is always lower than that of the pure solvent.
true
osmotic pressure depends on the number of solute particles in a given volume.
true
