Specific Heat
The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree
Heat Capacity
The amount of energy required to raise the temperature of a substance by 1 degree
calories
A non-SI unit of energy, 1 cal= 1.184 J
Calories
A unit to measure the energy value of foods
Joules
The SI unit of energy
Heat
Energy used to cause the temperature of an object to rise
Energy
The ability to do work or transfer heat
Temperature
A measure of the average kinetic energy of a substance
Potential Energy
Energy an object possesses by virtue of its position or chemical composition
Kinetic Energy
Energy an object possesses by virtue of its motion
Law of Conservation of Energy
Energy cannot be created nor destroyed, only transferred
Motion of Particles by Heat Transfer
Heat always flows from warmer objects to cooler objects
q=mC(change in)T
heat= mass x specific heat x change in temperature
(Change in)E= q + w
Change in internal energy = heat + work
Work or heat entering the system
q>0 w>0
work or heat exiting the system
q<0 w<0
Exothermic
When heat is released by the system
Endothermic
When heat is absorbed by the system
Chemical energy
Energy stored in the bonds of chemical compounds, released by bonds being broken and absorbed when bonds are formed
Enthalpy
Heat flow during a process taking place at constant pressure and the only work done is between pressure and volume
Heat Capacity and Specific Heat units
J/g-K
Hess's Law
The sum of the enthalpy formation in the products subtracted by the sum of the enthalpy formation of the reactants