1. Thermochemistry Energy Heat Thermochemical Equations Calculating Enthalpy Change Reaction Sponteneity

2. The Nature of Energy All chemical reactions and changes in the physical state of substances involve either the release or absorption of heat. Energy – the ability to do work or produce heat. Chemical potential energy – energy stored in a substance because of its composition. Heat – energy in the process of flowing from a warmer object to a cooler object. Law of conservation of energy – in any chemical reaction or physical process, energy can be converted to one form to another, but it is neither created nor destroyed. Thermochemistry – the study of heat changes that occur during chemical reactions and physical changes of state.

3. Heat Capacity Calorie – the amount of energy required to raise the temperature of one gram of pure water by one degree Celsius. (1 Calorie(kCal) = 1000 cal) Joule – SI unit of energy and of heat. (1 Joule =.2390 calories; 1 calorie = 4.184 joules) Heat capacity – the amount of heat it takes to change an object’s temperature by exactly 1 0 C.

4. Concept Practice These examples should go in your notes as we work them in class! (Pg. 265) #3 #4 #5 #6 #7

5. Specific Heat Capacity Specific heat – the amount of heat required to raise the temperature of one gram of that substance by one degree Celsius. Thermal Energy Equation: Q = m C T (examples worked in class) (Pg. 267)

6. Assignment Pg. 286, 33 – 38 (due Monday (2/3))