Chemistry: Catalysts and Reaction Energy

Which term refers to the speed at which a chemical reaction occurs?

What term describes the amount of substance present in a system?

What is the minimum amount of energy required for a chemical reaction to occur?

Which factor affects the rate of a reaction by influencing the number of collisions between reacting particles?

What is a substance called that increases the rate of a chemical reaction without being consumed?

What is the term for a substance that decreases the rate of a chemical reaction?

What is the term for a catalyst that exists in the same phase as the reactants?

Which term describes a catalyst that exists in a different phase from the reactants?

What theory explains how molecules must collide in a specific way for a chemical reaction to occur?

What is the term for the energy required to start a chemical reaction without the assistance of a catalyst?

What is the measure of the amount of a substance in a given volume?

Types of Catalysts

A homogeneous catalyst exists in the same phase as the reactants.
A heterogeneous catalyst exists in a different phase from the reactants.

Energy of Reaction

The energy required to begin a chemical reaction without a catalyst is shown by the uncatalyzed reaction curve.
The energy required to begin a reaction is lowered by the addition of a catalyst, shown by the catalyzed reaction curve.

Key Concepts

Concentration refers to the amount of substance present in a system.
Reaction Rate describes the speed at which a chemical reaction takes place.
Activation Energy is the minimum amount of energy required for a chemical reaction to occur.

Factors Affecting Reaction Rate

Surface Area affects the rate of a reaction by influencing the number of collisions between reacting particles.
Concentration affects the rate of a reaction by influencing the number of collisions between reacting particles.

Catalysts and Inhibitors

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.
An inhibitor is a substance that decreases the rate of a chemical reaction.
An activated complex is not a catalyst, but rather a temporary species formed during a reaction.

Test your knowledge of catalysts and reaction energy with this chemistry quiz. Covers homogeneous and heterogeneous catalysts, collision theory, and concentration.