What is the effect of raising the temperature on reaction rate? answer Reaction rate increases (approximately doubles for each 10K increase). Note: the equilibrium position may shift either in favor of products or reactants, depending on delta H (Le Chatelier's principle).	Why is hydrochloric acid (Ka » 1) a stronger acid than hydrofluoric acid (Ka = 3.5 x 10-4)? answer An chlorine atom has a much larger radius and more sheilding electrons than does a fluorine atom and so the electrostatic force of attraction on the bonding electrons is less. As a result, HCl dissociates more readily than HF.
Why is phosphorous able to form such compounds as PF5 while nitrogen cannot? answer Phosphorous can make use of vacant d orbitals to expand its valence orbitals. Nitrogen cannot.	Using the valence shell electron pair repulsion theory (VSEPR), what is the shape of PF5? answer The electron pairs are oriented as far from each other as possible. Thus, the shape is trigonal bipyrimidal.