# chapter 9

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1. boiling point
the temperature at which a liquid can spontaneously convert into a gas while under one atmosphere of pressure
2. coulomb's Law
Describes the force of attraction (or repulsion)

• F=q1q2
• 4πƐ0r2
3. crystal lattice Energy
the addition force of attraction an ion experiences when it is part of a larger crystal
4. Dipole-Dipole
this interaction is simply the force of attraction between polar molecules
5. evaporation (vaporization)
This occurs when a molecule at the surface of a liquid attains sufficient kinetic energy to escape the forces holding it in the liquid phase.
6. vapor pressure
The pressure exerted by the gas in equilibrium with a solid or liquid in a closed container at a given temperature.
7. molar enthalpy of vaporization
is a quantitative measure of the intermolecular forces of attraction is defined as heat energy requried to vaporize one mole of a liquid
8. Clausius Clapeyron equation
quantifies the ralationship between the heat of vaporization and temperature.

• ln P=- ΔHvap
• RT

9. Specific Heat
amount of heat needed to raise one gram that of that substance by one degree celcius
10. British Thermal Unit (BTU)
the amount of heat needed to raise on gallon of water by on degree Fahrenheit
11. sublimation
phase transition from a solid directly to a gas without passing through a liquid phase
12. Deposition
phase transition from a gas directly to a solid without passing through a liquid phase
13. triple point
the point at which a solid, liquid, and gas can coexist in equilibrium
14. critical point
occurs when you reach a temperature that is too hot for the liquid phase to exist while simultaneously reaching a pressure to great for the gas phase to exist.
15. Super critical fluid
phase that exists at temperatures and pressures above the critical point the kinetic energy of the molecules is well past what is needed to overcome the intermolecular forces of attraction and the pressure is so great that the molecules resemble a condensed state.
16. specific heat of water
1 calorie per gram degree celcius
17. calorie
amount of heat needed to raise gram of water by one degree celcius
18. dispersion forces
intermolecular attraction force that exists between all molecules. These forces are the result of the movement of electrons which cause slight polar moments and are generally very weak but as the molecular mass increases so does their strength
19. the molar enthalpy of fusion
energy required to convert one mole of a solid to one mole of liquid.
20. Condensation
the change of the physical state of matter from gaseous phase into liquid phase, and is the reverse of evaporation
21. hydrogen bonds
attractive interaction of a hydrogen atom with an electronegative atom, like nitrogen, oxygen or fluorine
22. Kinetic Molecular theory
explains the forces between molecules and the energy that they possess.
 Author: davis13 ID: 47402 Card Set: chapter 9 Updated: 2010-11-04 23:38:30 Tags: Chemistry Folders: Description: introduction to intermolecular forces Show Answers: