Decomposition of Hydrogen Peroxide Concepts

This lesson covers how a catalyst affects the decomposition rate of hydrogen peroxide. It explains the uses and storage of hydrogen peroxide, the decomposition reaction catalyzed by manganese oxide, and how to measure the reaction rate using a gas syringe. The lesson also discusses how to analyze the reaction rate by plotting oxygen volume against time and calculating the gradient of the tangent on the graph.

What is the concentration range of hydrogen peroxide used for household cleaning?

• 1% to 10%

• 3% to 30%

• 5% to 50%

• 10% to 40%

Why is hydrogen peroxide stored in dark containers?

• To avoid evaporation

• To prevent it from freezing

• To keep it from reacting with air

• To protect it from UV light

What role does manganese(IV) oxide play in the decomposition of hydrogen peroxide?

• It acts as a solvent

• It is a reactant

• It is a product

• It serves as a catalyst

How is the oxygen produced in the decomposition reaction measured?

• Using a thermometer

• With a gas syringe

• By a barometer

• With a pH meter

What indicates that oxygen gas is being produced in the reaction?

• A change in pH

• Fizzing or bubbling

• A temperature drop

• A change in color

What type of reaction is the decomposition of hydrogen peroxide?

• Neutral

• Exothermic

• Endothermic

• Reversible

What is the purpose of quickly stoppering the flask in the experiment?

• To prevent heat loss

• To avoid contamination

• To maintain pressure

• To stop oxygen from escaping

What does a steeper gradient on the reaction rate graph indicate?

• A constant reaction rate

• A slower reaction rate

• A faster reaction rate

• No change in reaction rate

How can the rate of decomposition be determined from the graph?

• By measuring the height of the curve

• By counting the number of peaks

• By calculating the gradient of the tangent

• By measuring the area under the curve

What happens to the rate of decomposition at the start of the reaction?

• It is very slow

• It remains constant

• It is very fast

• It decreases gradually