Collision Theory

Front

What is Collision Theory?

Back

Collision Theory explains how chemical reactions occur and why reaction rates differ for different reactions. It states that for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation.

Front

What is an effective collision?

Back

An effective collision is a collision between reactant particles that results in a chemical reaction. It occurs when the particles collide with enough energy and in the correct orientation.

Front

What role do catalysts play in chemical reactions?

Back

Catalysts speed up chemical reactions by lowering the activation energy required for the reaction to occur, allowing more collisions to be effective.

Front

What is activation energy?

Back

Activation energy is the minimum amount of energy required for reactants to collide successfully and form products.

Front

List three factors that affect the rate of a chemical reaction.

Back

1. Temperature 2. Concentration of reactants 3. Surface area of reactants

Front

How does temperature affect reaction rates?

Back

Increasing the temperature generally increases the reaction rate because it provides reactant particles with more energy, leading to more frequent and effective collisions.

Front

What is the effect of increasing the concentration of reactants on reaction rate?

Back

Increasing the concentration of reactants typically increases the reaction rate because it leads to a higher number of particles in a given volume, resulting in more collisions.

Front

Why does particle size affect reaction rates?

Back

Smaller particle sizes increase the surface area available for collisions, leading to more frequent effective collisions and a faster reaction rate.

Front

What is the difference between a catalyst and a reactant?

Back

A catalyst is a substance that increases the rate of a reaction without being consumed in the process, while a reactant is a substance that undergoes a chemical change during the reaction.

Front

What is the significance of orientation in collisions?

Back

The orientation of colliding particles is significant because only certain orientations will lead to effective collisions that result in a reaction.