Investigating the Rates of Reaction Between Hydrogen Peroxide and Manganese Dioxide

Investigating the Rates of Reaction Between Hydrogen Peroxide and

Manganese Dioxide

Aim:

My aim for this investigation is to find out how concentration affects

the rate of reaction between hydrogen peroxide and manganese dioxide.

Equipment List:

Syringe filled with water (gas collector);

Conical flask;

Manganese dioxide powder;

Hydrogen Peroxide liquid;

Measuring cylinder (5 ml);

Timer;

Clamp and Stand;

Cork;

Glass (delivery) tube;

Water Basin with water;

Electronic Scales.

Diagram of Experiment Set-up:

Prediction:

My prediction is that if the amount of manganese dioxide, the powder,

increases there will be an increase in the rate of reaction. For

example the highest concentration of powder will have the fastest

reaction time.

Collision Theory:

In a reaction between two gaseous substances A&B a molecule of A must

collide with B for the reaction to work, but in a concentrated

solution there will be a higher percentage of reactants which will

have no more energy. Not all collisions cause a reaction, only the

ones which reach the activation energy of the reaction.

So collision rate is directly proportional to the reaction rate.

This is why I predict that the rate of reaction will increase as the

concentration of the manganese dioxide powder increases.

Variables:

There are many different variables that will affect the rate of

reaction. Below are most of the known factors that will affect the

rate of a reaction that will be kept constant during the experiment:

1. The size of the particles of the solid reactant.

2. The concentration of the reactant's solution; the liquid: hydrogen

peroxide.

3. The temperature at which reactants undergo reaction.

4. The addition of other substances such as catalysts.

5. Other sources such as light in photosynthesis.

The above variables will stay controlled, and the chosen variable is:

1. Amount of manganese dioxide.

Concentration is a very important factor when investigating rates of

reaction. The concentration of a solution can greatly effect a