Ch11-12 IMFs & Solution Properties Vocab

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34 Terms

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Dipole

equal and opposite charges within a molecule (partial positive + negative charges); occurs due to differences in electronegativity

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Dipole-Dipole Attraction (dipole interactions)

IMF between 2 polar molecules

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Hydrogen Bonding

specific type of dipole-dipole where H and NOF (small, highly electronegative elements) attract each other

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London Dispersion Forces

dipole-induced dipole force; temporary dipoles on nonpolar molecules; strength increases w/ number of e-

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Ion-Dipole Attraction

attraction between ion and polar molecules

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Surface Tension

cohesive force at a liquid’s surface that attracts it to itself

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Capillary Action

attraction between liquid and its narrow tube container (meniscus)

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Cohesive Forces

attraction between particles of the same type

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Adhesive Forces

attraction between particles of one type and particles of another type

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Viscosity

a measure of a fluid’s resistance to flow

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Crystalline Solids

organized, repeating 3D structure; well-defined melting points

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Amorphous Solids

random, no repeating structure; no sharp melting point, gradually melt over a range of temps

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Lattice

3D arrangement of points that represent the positions of atoms, ions, or molecules in a crystalline solid

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Unit Cell

the smallest repeating unit in a crystal lattice that, when repeated, can recreate the crystal’s entire structure

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Alloy

mixture of 2+ elements (1+ is a metal)

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Substitutional Alloy

when some of the atoms of the original metal are replaced by atoms of a different metal (same crystal structure as original metal)

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Interstitial Alloy

when new, smaller atoms fill the spaces between the larger, original atoms

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Vaporization (evaporation)

process of liquid to vapor; evaporation is a specific type of vaporization that occurs when a liquid is below its boiling point

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Heat of Vaporization

the amount of energy required to turn one mole of liquid to vapor at constant temp and pressure

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Condensation

process of vapor to liquid

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Equilibrium

rates of forward and reverse processes are equal; thermodynamic equilibrium is when heat transfer is at its minimum (zero)

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Equilibrium Vapor Pressure

pressure exerted by a vapor that is in thermal equilibrium with its condensed phase at a given temp in a closed system; reflects how easily molecules escape from liquid to vapor phase (high IMF = low vapor pressure)

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Sublimation

direct transition from solid to gas without passing through liquid phase

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Heating Curve

graphical representation of temp change of a substance as it is heated, showing phase changes where temp is constant even as heat is added

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Heat of Fusion

amount of heat needed to convert solid to liquid at its melting point without changing temp

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Normal Melting Point

temp at which solid becomes liquid under standard atmospheric pressure (1 atm)

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Normal Boiling Point

temp at which liquid becomes vapor under standard atmospheric pressure (1 atm)

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Superheated

liquid that has been heated above its normal boiling point without it actually boiling (can happen when there are no impurities/nucleation sites to facilitate boiling)

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Supercooled

liquid that remains liquid below its normal melting point without crystallizing (can happen when there are no impurities/nucleation sites to facilitate crystallization)

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Phase Diagram

graphical representation of a substance’s phases and when they are stable based on temp and pressure

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Triple Point

the specific temp and pressure at which all 3 phases coexist in equilibrium

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Critical Point

critical temp + critical pressure; marks the end of the phase boundary between liquid and gas; at temps and pressures higher than this point, the substance exists as a supercritical fluid

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Critical Temperature

highest temp at which a substance can exist at a liquid (above this temp, no amount of pressure can liquefy the substance)

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Critical Pressure

minimum pressure needed to liquefy a substance at its critical temperature