Reaction Rates

Front

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

Back

Increasing the concentration of reactants increases the rate of reaction because it leads to more frequent collisions between particles.

Front

What do exothermic reactions do?

Back

Exothermic reactions release energy, usually in the form of heat.

Front

How does temperature affect reaction rates?

Back

Higher temperatures increase the rate of a reaction by increasing both the frequency and energy of particle collisions.

Front

Why does a higher concentration of reactants increase the rate of reaction?

Back

A higher concentration increases the frequency of particle collisions because there are more collision sites.

Front

What type of reaction absorbs energy?

Back

Endothermic reactions absorb energy.

Front

What is activation energy?

Back

Activation energy is the minimum energy required for a chemical reaction to occur.

Front

How does a catalyst affect reaction rates?

Back

A catalyst increases the rate of a reaction by lowering the activation energy.

Front

What is the relationship between surface area and reaction rate?

Back

Increasing the surface area of reactants increases the reaction rate by allowing more collisions to occur.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the collision theory?

Back

Collision theory states that for a reaction to occur, reactant particles must collide with sufficient energy and proper orientation.