My aim is to look at the effect of a catalyst on a substance. I will be changing the quantity of manganese dioxide to see if increasing the quantity has an effect on how much gas is produced and how quick.

Measuring Cylinder,

Beaker,

Stopwatch,

Mass Machine,

Petri dish,

Spatula

Health and Safety: -

1. Make sure safety specs are worn all the time.
2. Tie back hair.
3. Wear a lab coat.
4. Any spillages should be cleaned up straight away.

Method: -

1. Put on a lab coat, safety specs, and tie back loose hair.
2. Take a petri dish and place it on a mass machine. Press the clear button to clear any measurements made.
3. Measure out 0.05 grams of manganese dioxide in the petri dish using the spatula.
4. Take a beaker and pour in some hydrogen peroxide.
5. Using the beaker measure 20cm of hydrogen peroxide into a measuring cylinder.
6. Assemble the gas syringe, clamp stand, and beaker with a bung.
7. Pour the 20cm³of hydrogen peroxide into the beaker that is attached to the gas syringe.
8. Add the 0.1 grams of manganese dioxide into the beaker with the 20cm³of hydrogen peroxide and place the bung in the beaker and start the stopwatch.
9. Every 10seconds measure on the syringe how much gas is produced and record this in a table. Do this until no more gas can be produced in the gas syringe (90mm). Repeat this procedure for 0.1g, 0.2g, 0.3g, and 0.4g in the same way.

Conclusion: -

From my results I can see that my prediction is correct in saying that as the manganese dioxide increases in mass the amount of gas produced will be produced quicker but equal amounts of gas will be produced. I can see that as the amount of manganese dioxide increases the amount of gas produced is produced a lot faster than the test before i.e. when 0.05grams of manganese dioxide was placed in the hydrogen peroxide it took 1280 seconds for the maximum amount of gas to be produced, and for the 0.1grams of manganese dioxide it took 560 seconds for the maximum amount of gas to be produced. The difference in time is 720 seconds. The amount time taken for the gas to reach its maximum keeps decreasing as the amount of manganese dioxide increases. The minimum amount of time taken for the manganese dioxide was 40 seconds and that was for 0.4 grams of manganese dioxide as that was the last test I carried out.

Evaluation: -

This experiment could be improved by carrying out the experiment more than once for this I would need more time in the lab to be able to carry it out successfully. I would also make sure that I used the mass machine to weigh the manganese dioxide incase different machines gave different results. I would also make sure I used the all the same apparatus if I had to continue my experiment at a different time because different apparatus have different measurements and that would effect the experiment.