Honors Chemistry

Chapter 17 Study Guide

Can you:

· Define enthalpy?

· Explain how the enthalpy stored in a group of atoms could increase or decrease as a result of a chemical reaction?

· Define heat of reaction?

· Draw a potential energy diagram for an exothermic or endothermic reaction?

· Find Heat of Reaction, or DH, given a balanced chemical equation with the energy value included?

· Write a balanced chemical reaction including the energy value given DH?

· Determine DH per mole of a particular reactant or product given the DH for the reaction as written?

· Explain why a reaction might have more than one value for DH?

· Do calorimetry calculations given sample data (as we did in the lab)?

· Define Hess’s Law?

· Use Hess’s Law to determine the DH when two or more reactions combine to get the same results as another reaction?

· Use Hess’s Law and a table of standard heats of formation to determine DH for a reaction?

· Explain collision theory?

· Define reaction rate, including the units used?

· List the factors that affect reaction rate and how each of these factors accomplishes this in terms of collision theory?

· Define activation energy, and explain its role in reaction rate?

· Define catalyst and explain how, in general, any catalyst accomplishes its purpose?

· Explain common phenomena regarding reaction rate (i.e. pressure cooker, powdered charcoal, etc.)

· Explain why the rate of a reaction with a high activation energy will be more sensitive to a change in temperature?

· Explain what we mean by a reaction mechanism and why the slowest step in the mechanism is of interest to us?

· Write the rate law expression and complete a data table for reaction rate given the reaction mechanism?

· Explain the relationship between the slowest step in a mechanism and the rate law?

· Determine the rate law given the reaction data?

· Explain why the reaction data supports or disproves a particular mechanism?

· Calculate the rate constant given the reaction data and the rate law?