BJU Chemistry Chapter 16 Review

A reaction represented by an energy diagram in which ΔH is positive is ___.

• exothermic

• endothermic

• activation energy

• the activated complex

The transitional structure between reactants and products needed to jump start a reaction is called ___.

• a catalyst

• the reaction rate

• activation energy

• the activated complex

The peak in an energy diagram represents __________.

• a catalyst

• an inhibitor

• the activation energy

• the products

Which of the following factors does not significantly affect reaction rate?

• concentration

• temperature

• pressure

• surface area

If a substance is broken up into more pieces and exposes more surface area, the reaction rate will ___.

• progress faster

• progress slower

• remain constant

• not be affected

If a solid material is capable of adsorbing molecules of gases or liquids onto its surfaces, then is it a(n) ___ catalyst.

• organic

• heterogeneous

• complex

• elementary

The process of molecules of one substance collecting on the surface of another is called ___.

• adhesion

• absorption

• cohesion

• adsorption

Which of the following is a special and distinct class of catalysts that may cause reactions to occur millions of times faster?

• homogeneous catalysts

• heterogeneous catalysts

• enzymes

• inhibitors

A catalyst that is in the same phase as the reactants or in solution with a reactant is called a(n) ___.

• homogenous catalyst

• heterogeneous catalyst

• enzyme

• inhibitor

Aspirin working to block the action of two different enzymes that cause inflammation and pain is an example of a(n) ___.

• homogeneous catalyst

• heterogeneous catalyst

• enzyme

• inhibitor