•even though Chemistry is the study of matter, energy effects matter
	
		•energyis anything that has the capacity to do work
	
		•workis a force acting over a distance
	
		 
	
		- Classification of  Energy: Kinetic energy, Potential energy
	
		- Law of Conservation of Energy: 
	
		•energy cannot be created or destroyed
	
		 First Law of Thermodynamics
	
		•energy can be transferred between objects
	
		•energy can be transformed from one form to another
	
		heat → light → sound
	
		- How Is Energy Exchanged?
	
		•energy is exchanged between the system and surroundings through heat and work
	
		 q= heat (thermal) energy
	
		 w= work energy
	
		 q and w are NOT state functions, their value depends on the process
	
		                delta E= q + w
	
		Measuring  delta E, Calorimetryat Constant Volume
	
		Measuring delta H, Calorimetryat Constant Pressure
	
		- Relationships Involving  delta Hrxn and Hess’s Law