chem module 15 vocab

energy, specific heat, and hess's law

energy

capacity to do work

potential energy

stored energy or energy of position

kinetic energy

energy of motion

therm energy (heat)

outward manifestation of movement at atomic level

heat change (enthalpy)

amount of heat energy released or absorbed during a process

exothermic

process in which energy is released as it proceeds, and surrounding becomes warmer

endothermic

process in which energy is absorbed as it proceeds, and surroundings become colder

water phase change

temperature remains constant

calorie

heat required to raise temperature of 1 gram of water by 1 celsius degree

molar heat of fusion

energy that must be absorbed in order to convert one mole of solid to liquid at its melting point

molar heat of solidification

energy that must be removed in order to convert one mole of liquid to salid at its freezing point

molar heat of vaporization

energy that must be absorbed in order to convert one mole of liquid to gas at its boiling point

molar heat of condensation

energy that must be removed in order to convert one mole of gas to liquid at its condensation point

melting

solid to liquid

ssublimation

solid to gas

deposition

gas to solid

first law of thermodynamics

energy can not be created nor destroyed