Investigate and compare the effects of pH on the catalytic effect of the enzyme catalase, found in (a) celery and (b) animal liver, on the rate of breakdown of hydrogen peroxide.
Investigate and compare how the solubilities, in water, of (a) potassium chloride and (b) sodium carbonate (anhydrous) change with temperature.
Investigate and compare how the rates of flow of powdered or granulated solids through a funnel are affected by (a) the size of the solid particles and (b) any one of the funnel dimensions.
- Do some research. The more you know about the background to your investigation the better.
- Design the experiment. For instance, what pH values are you going to test if you decide to do the Biology investigation?
- Plan. Write a list of the equipment, materials, chemicals etc that you will need.
- Think safety. Ensure you always wear a lab coat and lab safety glasses when doing work in the laboratory. Wear gloves when necessary.
When conducting your experiment remember these important points:
- Collect and make sure you have all the equipment you need.
- Keep everything organised and close at hand when conducting your experiment.
- Be fair - make sure volumes and masses are the same.
- Have a control(s) where appropriate.
- Have your lab notebook ready at hand to take down notes and results.
- Try to put your results in table format - it's easier to make sense of.
After you have finished your experiment remember these important points:
- Ensure you have all the results you need and taken down accurately.
- Tidy up all the equipment putting everything back so that you will be easily able to locate it when you repeat your experiment.
- Write up everything about your experiment, in as much detail as possible.
- Think about ways you could have improved your experiment or any additional things you would like to include in the experiment.