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Chapter 12
N/A
38
Chemistry
11th Grade
03/11/2009

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Term
Intermolecular Forces
Definition
-Attractive forces between molecules.
-Much weaker than chemical bonds.
-(Van Der Waals Forces)
Term
London Dispersion
Definition
Attraction between 2 instantaneous dipoles
Term
London Dispersion
Definition
Asymmetrical electron distribution
Term
London Dispersion
Definition
Dispersion with all atoms and moles.
Term
Dipole-Dipole Forces
Definition
Attraction between polar molecules (permanent dipoles also)
Term
Hydrogen Bonding
Definition
Attractionm between molecules with N-H, O-H, F-H bonds
-Extremely polar bonds
Term
London Dispersion
Definition
Increases in strength as molar mass increases
Term
Dipole
Definition
Created by equal but opposite charges that are seperated by a short distance.
Term
Surface Tension
Definition
Attractive force between particles in a liquid that minimizes surface area.
Term
Capillary Action
Definition
Attractive force between the surface of a liquid and the surface of a solid.
Term
Deposition
Definition
Gas-Solid
Term
Sublimination
Definition
Solid-Gas
Term
Condensation
Definition
Gas-Liquid
Term
Vaporization
Definition
Liquid-Gas
Term
Evaporation
Definition
Molecules at the surface gain enough energy to overcome IMF.
Term
Volatility
Definition
Measure of evaporation rate
Term
Equilibrium
Definition
trapped molecules reach a balance between evaporation and condensation
Term
Vapor Pressure
Definition
Pressure of water vapor above a liquid at equilibrium
Term
Boiling Point
Definition
Temperature at which vapor pressure of liquid equals external pressure.
Term
Polar has ______ m.p.
Definition
higher
Term
Ionic has ________ m.p.
Definition
higher
Term
Chart Order
Definition
Solid,Melting,Liquid,Boiling,Gas
Term
Heat Capacity
Definition
Energy required to raise the temperature of 1 gram of a substance by 1 C.
Term
Phase Change
Definition
Change in molecular arrangement.
-temp. remains constant
Term
Heat of Fusion
Definition
Energy required to melt 1 gram of a substance at its m.p.
Term
Substance at it's b.p.
Definition
Usually larger than Huap
Term
Critical Temperature
Definition
The temperature above which the substance can no longer exist as a liquid.
Term
Critical pressure
Definition
The lowest pressure that a substance can exist as a liquid at the critical temperature.
Term
Critical Point
Definition
Indicates the critical temperature & pressure.
Term
Triple Point
Definition
Conditions of temperature & pressure at solid, liquid, and vapor can coexist at equilibrium.
Term
Supercooled Liquids
Definition
Substances that retain certain liquid properties even at temperatures at w hich they appear to be solid.
Term
Crystal Structure
Definition
Total 3D arrangement of crystal particles.
Term
Volatile liquids _______-
Definition
Evaporate readily
Term
Le Chateliers Principle
Definition
When a system at equilibrium is distributed by application of a stress, it attains a new equilibrium position that minimizes the stress.
Term
Ionic Crystals
Definition
Consists of positive & negative ions arranged in a regular pattern.
-Group 1 or Grtoup 2 + Group 16 or Group 17
-hard,brittle,high M.P., good insulators
Term
Covalent network crystals
Definition
Contain single atoms
-covalent bonding extends thoroughout network
-large number of atoms
-diamonds,quartz,silicon carbide
-hard,brittle,high m.p.s, nonconductors or semiconductors
Term
Metallic crystals
Definition
consists of metal atoms surrounded by a sea of valence electrons
-m.p.s vary greatly
-freedom of outer structure electrons
Term
Covalent molecular crystals
Definition
covalently bonded molecules held together by intermolecular forces
-low m.p,s
-relatively soft
-good insulators
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