chem themo vocab

Calorie

Quantity of heat needed to raise the temperature of 1 g of water by 1 degree C

Heat

Energy that is transferred due to a difference in temperature

+H

Endothermic

-H

Exothermic

Joule

SI unit of energy

Enthalpy

Heat content of a system at constant pressure

System

Part of the universe on which you focus your attention

Universe

System plus the surroundings

Molar heat of fusion

Energy required to melt one mole of a substance

Sublimation

Solid turning directly into a gas

C

Stands for specific heat with units of J or cal/g. Does NOT stand for degrees C

T

Change in temp (final-initial). Most common unit is degree C

ATM

One of these is equal to 101.3 kPa

Pa

SI unit for pressure

J

SI unit for energy

q

Stands for heat - with units of J or cal (a form of energy)

Cal

A unit of energy - it is equal to the amount of energy needed to raise the temperature of 1 gram of water by one degree C

m

Stands for mass, usually with units of gram