chem 1020 final exam ACTUAL UPDATED QUESTIONS AND CORRECT ANSWERS
What is a mixture? A combination of two or more pure substances blended together without
chemically changing them.
What is a heterogeneous mixture? A mixture with visually non-uniform mixing of components.
What is a homogeneous mixture? A mixture with visually uniform mixing of components.
What are the three types of homogeneous mixtures? Solutions, colloids, and suspensions.
What is a solution? A homogeneous mixture containing particles with diameters of 0.1-2 nm.
What is a colloid? A homogeneous mixture containing particles with diameters of 2-500 nm.
What is a suspension? A heterogeneous mixture containing particles with diameters greater than 500
nm.
What is the solute in a solution? The dissolved substance, which is the minor component.
, What is the solvent in a solution? The major component of the solution.
What does ∆Hsolvent-solvent > 0 indicate? Energy is absorbed to disrupt intermolecular forces between solvent molecules.
What does ∆Hsolute-solute > 0 indicate? Energy is absorbed to disrupt intermolecular forces between solute molecules.
What does ∆Hsolvent-solute < 0 indicate? Energy is released as solute and solvent form intermolecular forces.
What is the overall enthalpy of solution formula? ΔHsolution = ΔHsolute-solute + ΔHsolvent-solvent + ΔHsolvent-solute.
What principle is summarized by 'like dissolves like'? Polar solvents dissolve polar and ionic solutes; nonpolar solvents dissolve
nonpolar solutes.
What is molarity (M)? Molarity is defined as moles of solute per liter of solution.
What is molality (m)? Molality is defined as moles of solute per kilogram of solvent.
What does percent mass (% mass) represent? The mass of solute divided by the total mass of the solution, multiplied by 100.
What is a saturated solution? A solution that contains the maximum amount of dissolved solute at equilibrium.
What is Henry's Law? Solubility of a gas is proportional to its partial pressure above the solution.
What is vapor pressure? The partial pressure of a gas in equilibrium with its liquid at constant temperature.
What is Raoult's Law? Psolution = Psolvent · Xsolvent, where Psolution is the vapor pressure of the
solution.
What is a mixture? A combination of two or more pure substances blended together without
chemically changing them.
What is a heterogeneous mixture? A mixture with visually non-uniform mixing of components.
What is a homogeneous mixture? A mixture with visually uniform mixing of components.
What are the three types of homogeneous mixtures? Solutions, colloids, and suspensions.
What is a solution? A homogeneous mixture containing particles with diameters of 0.1-2 nm.
What is a colloid? A homogeneous mixture containing particles with diameters of 2-500 nm.
What is a suspension? A heterogeneous mixture containing particles with diameters greater than 500
nm.
What is the solute in a solution? The dissolved substance, which is the minor component.
, What is the solvent in a solution? The major component of the solution.
What does ∆Hsolvent-solvent > 0 indicate? Energy is absorbed to disrupt intermolecular forces between solvent molecules.
What does ∆Hsolute-solute > 0 indicate? Energy is absorbed to disrupt intermolecular forces between solute molecules.
What does ∆Hsolvent-solute < 0 indicate? Energy is released as solute and solvent form intermolecular forces.
What is the overall enthalpy of solution formula? ΔHsolution = ΔHsolute-solute + ΔHsolvent-solvent + ΔHsolvent-solute.
What principle is summarized by 'like dissolves like'? Polar solvents dissolve polar and ionic solutes; nonpolar solvents dissolve
nonpolar solutes.
What is molarity (M)? Molarity is defined as moles of solute per liter of solution.
What is molality (m)? Molality is defined as moles of solute per kilogram of solvent.
What does percent mass (% mass) represent? The mass of solute divided by the total mass of the solution, multiplied by 100.
What is a saturated solution? A solution that contains the maximum amount of dissolved solute at equilibrium.
What is Henry's Law? Solubility of a gas is proportional to its partial pressure above the solution.
What is vapor pressure? The partial pressure of a gas in equilibrium with its liquid at constant temperature.
What is Raoult's Law? Psolution = Psolvent · Xsolvent, where Psolution is the vapor pressure of the
solution.
