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BJU Chemistry Ch 12
Bob Jones Chemistry - Chapter 12
Term | Definition |
---|---|
boiling-point elevation | A raised boiling point of a solvent caused by the presence of solute particles. |
Brownian motion | The random, chaotic movements of microscopic particles. |
colligative property | A physical property of a solution that depends only on the number of solute particles present without regard to type. |
colloid | A mixture of small particles (between 1 and 1000 nm in size) that remain dispersed in a medium. |
concentration | A measure of the number of solute particles in a certain volume or mass of the solvent, or of the solution itself. |
dispersed phase | In a colloidal mixture, the phase in which the particles are spread out. |
dispersing medium | The medium in a colloidal mixture that separates the dispersed phase. |
dissociation | A type of solvation in which an ionic compound forms ions when it dissolves in a solvent. |
dynamic equilibrium | A chemical equilibrium in which two or more opposing events occur at the same rate but result in no net change. |
effervescence | The escape of a gas from a liquid-gas solution. |
enthalpy (heat) of solution | The net energy change during the dissolving process. It is expressed in kJ/mol. |
freezing-point depression | A reduction in the freezing point of a solvent caused by the presence of solute particles. |
Henry's law | The gas law that states that the solubility of gases is directly proportional to the partial pressures of the gases above the solution. |
hydration | A type of solvation in which water molecules surround and interact with solute particles. |
immiscible | Pertaining to two liquids that are not soluble in each other. |
ionization | A type of solvation in which a covalent compound forms ions when it dissolves in a solvent. |
miscible | Pertaining to two liquids that are completely soluble in each other. |
molal boiling-point constant | A number that relates the change in boiling point of a particular solvent to the concentration of solute particles. |
molal freezing-point constant | A number that relates the change in freezing point of a particular solvent to the concentration of solute particles. |
molality | A quantitative measure of concentration equal to the number of moles of solute per kilogram of solvent; m = mol solute/kg solvent. |
molarity | The most common quantitative measure of concentration equal to the number of moles of solute per liter of solution; M = mol solute/L solution. |
osmosis | The diffusion of pure solvent molecules, such as water, through a semipermeable membrane. |
osmotic pressure | The amount of pressure required to resist osmosis. |
percent by mass | A quantitative measure of concentration in which the mass of the solute is compared to the mass of the solution. It equals the mass of solute/mass of solution x 100%. |
percent by volume | A quantitative measure of concentration in which the volume of the solute is compared to the volume of the solution. It equals the volume of solute/volume of solution x 100%. |
saturated | Pertaining to a solution that contains the maximum amount of solute possible at a given set of conditions; pertaining to an organic compound such as a fat that contains the maximum possible number of hydrogen atoms (4) and has no double or triple bonds. |
solubility | The maximum amount of solute that can dissolve in a specific solvent under specific conditions, such as temperature and pressure. |
solute | The minority substance in a solution; the substance that is dissolved. |
solution | A homogeneous mixture of two or more substances in a single phase. |
solvation | The process in which solvent particles surround and interact with solutes; the dissolving process in solid-in-liquid solutions. In an aqueous solution this is called hydration. |
solvent | The most abundant substance in a solution; the substance that does the dissolving. |
supersaturation | The condition of a solution that contains more dissolved solute than it does at equilibrium. |
Tyndall effect | The scattering of light by particles in a colloid. |
unsaturated | A solution that contains less than the maximum amt. of solute at a given set of conditions. |