Hypothesis
The more manganese oxide is used as a catalyst, the faster hydrogen peroxide will decompose.
Equipment
Conical flask and delivery tube
Bowl of water
Measuring cylinder (100 centimetres cubed)
Measuring cylinder (25 cm cubed)
Hydrogen Peroxide (10 vol)
Manganese oxide
Spatula
Top-pan balance
Stopwatch
Method
Pour some hydrogen peroxide (15ml) into the conical flask. Pass the delivery tube into the bowl of water underneath an upturned and filled measuring cylinder (100 cm^3). Add 0.01g of Manganese oxide to the hydrogen peroxide and start the stopwatch. Measure how long it takes for 50 cm^3 of oxygen to be produced. Repeat this process with larger masses of Manganese oxide (adding 0.01g at a time until 0.07g is added).
Risk Assessment
It is important to wear safety goggles to avoid any splashes hitting eyes. Provided goggles are worn this is a low risk experiment.