Rates of Reaction HL

Front

Define rate of reaction.

Back

The rate of reaction is the change in concentration of any one reactant or product in unit time.

Front

What is catalysis?

Back

Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst.

Front

How can you monitor the rate of production of oxygen from hydrogen peroxide?

Back

By using manganese dioxide as a catalyst and measuring the volume of oxygen gas produced until the reaction stops.

Front

What is the average rate of reaction?

Back

Average Rate = Total Gas Produced / Total Time Taken.

Front

Define instantaneous rate of reaction.

Back

The instantaneous rate of reaction is the rate of a reaction at any one particular time during the reaction.

Front

How do you calculate the instantaneous rate of reaction?

Back

1. Draw a tangent to the curve at the specified time. 2. Choose 2 points on this tangent. 3. Use Rise/Run to find the slope of the tangent.

Front

What is activation energy?

Back

Activation Energy (Eact) is the minimum amount of energy that particles need in order to react.

Front

What is an effective collision?

Back

An effective collision is a collision between particles that has enough energy for a reaction to occur.

Front

How does the nature of reactants affect reaction rate?

Back

Ionic compounds react quickly as their bonds are already broken in water. Covalent compounds react slowly as their bonds need to be broken first.

Front

How does particle size affect reaction rate?

Back

Smaller particle size means faster reactions due to higher surface area and more frequent collisions.