Energy Exchange / Transfer  

The last major section is Energy Calculations. No chemical reaction will occur without at least some degree of energy change. Energy will be released or taken in. 

Whenever a substance undergoes a physical change there is a change of heat energy. The amount of heat energy gained or lost depends upon the mass of the substance, the amount of temperature change and the specific heat of the substance. Not all substances gain or lose the same amount of heat energy.

