Catalysts and Gibbs Free Energy

The video tutorial addresses a question from the ACS exam about catalysts. It explains that catalysts do not affect the Gibbs free energy (Delta G) or the equilibrium constant of a reaction. Instead, catalysts work by reducing the activation energy, thereby increasing the reaction rate. The tutorial also covers energy diagrams, distinguishing between endothermic and exothermic reactions, and clarifies that catalysts do not change the final product concentration.

What is the main topic of the question from the ACS exam book?

• The role of temperature in reactions

• The behavior of a catalyst

• The concept of equilibrium

• The definition of entropy

Which of the following is true about Gibbs free energy (Delta G)?

• It is unrelated to spontaneity

• It determines the speed of a reaction

• It is calculated as Delta H minus T Delta S

• It directly affects catalyst behavior

What does a negative Delta G indicate about a reaction?

• The reaction is non-spontaneous

• The reaction is at equilibrium

• The reaction requires a catalyst

• The reaction is spontaneous

Which type of reaction involves the release of heat, making the products more stable than the reactants?

• Endothermic reaction

• Exothermic reaction

• Catalytic reaction

• Equilibrium reaction

What is the effect of a catalyst on activation energy?

• It increases activation energy

• It decreases activation energy

• It has no effect on activation energy

• It changes the equilibrium constant

How does a catalyst affect the speed of a reaction?

• It slows down the reaction

• It speeds up the reaction

• It has no effect on reaction speed

• It stops the reaction

What is the correct answer to the question about catalyst behavior?

• A catalyst reduces Delta H

• A catalyst increases Delta G

• A catalyst increases equilibrium constant

• A catalyst reduces activation energy

What is the role of a catalyst in a chemical reaction?

• To increase the final product concentration

• To change the reaction's Delta H

• To reduce the activation energy

• To alter the reaction's Delta G

Which statement is true about the effect of a catalyst on the equilibrium constant?

• A catalyst increases the equilibrium constant

• A catalyst decreases the equilibrium constant

• A catalyst changes the final product concentration

• A catalyst does not affect the equilibrium constant

Which of the following is NOT affected by a catalyst?

• Product appearance

• Reaction speed

• Activation energy

• Equilibrium constant