What is the activated complex?

• The reacting pair at the top
• The slowest reactant in the mixture
• A catalyst that lowers the barrier

Why does collision theory fail for bulky molecules?

• Molecules stop colliding when they grow large
• Aim and orientation are miscounted
• Bulky molecules carry no activation energy

The Eyring equation builds the rate constant from enthalpy and entropy of activation.

How do the Arrhenius activation energy and the activation enthalpy compare for a gas reaction?

• They are always exactly equal
• Arrhenius energy is a little larger
• The activation enthalpy is far larger

A reaction shows a large negative entropy of activation. What does that say about the transition state?

• It is loose and disordered
• It has fallen apart into free atoms
• It is tight and ordered

On an Eyring plot of the natural log of k over T against one over T, what does the slope give?

• The entropy of activation
• Enthalpy of activation
• The rate constant itself

Rate data give a strongly negative activation entropy. A student argues the transition state is loose. How do you answer?

• Agree, since negative values always mean disorder
• Argue for an ordered state, since freedom was lost
• Ask for more data, since entropy says nothing about geometry

Two reactions give Eyring lines, one much steeper than the other. What follows?

• The steeper one has the larger enthalpy of activation
• The steeper one has the larger entropy of activation
• The steeper one must have the smaller rate constant at every temperature