Write down what you hope to prove in your experiment. State your hypothesis (what you think will happen) during the experiment. List all of the materials you need to do the experiment.
Discuss step-by-step each stage of the experiment. Include everything you did to accomplish the experiment from setting it up to making observations. Someone else should be able to reproduce your experiment just by following your instructions.
Detail your results. Look for changes that happened during your experiments. Write measurements and observations in an experiment journal or log. Write down even if no changes happened at all. Your log will make it easier to write down your results in your report. Take before and after pictures to include with your report.
Write a conclusion that states whether your hypothesis was proved correct. Include reasons you believe your hypothesis was shown to be correct or not. State how you would do the experiment differently in the future. Show how you would expand on the experiment, such as including different variables to test.