Freshman Chemistry Guide 5

This study guide contains over 3 hours and 15 minutes of recorded lecture topics and example problems that follow the material covered in chapter 6 of the textbook Chemistry, The Molecular Nature of Matter and Change by Silberberg. The topics covered include:


The definition of a system and its surroundings.
Energy transfer: how energy move into or out of a system as heat and/or work
Energy conservation: the relationships among internal energy change (delta E),heat,and work.
The definition of a state function and why delta E is constant even though heat change,q, and work done,w, vary.
The enthalpy function, H, and the relation between delta E and delta H.
The meaning of delta H, its magnitude and sign in exothermic and endothermic reactions.
Specific heat capacity and its calculation from the amount of heat transferred.
Using constant-pressure (coffee-cup) and constant-volume (bomb) calorimeters to measure heat change.
How deltaH of reaction is related to the amount of substances in a reaction.
The use Hess’s law to determine values of delta H of reaction.

The definition of a formation equation and the standard heat of formation.
Finding delta H of reaction by tallying bond energy changes associated with the decomposition of reactants followed by the formation of products