A detailed discussion of the results is need and this is where you must repeat the writing of the detailed science found in the plan. Link the science back to the prediction. Don't worry if your prediction was incorrect. High marks are awarded to students who read off values from their graphs or calculate several gradients . Discuss only the original variable .
Many students write lots about other variables.
This is waffle that scores no marks. Discuss sources of error , i.e . Discuss possible improvements in your experiment, i.e. I could have measured the volumes of liquids more accurately by using a pipette, burette or syringe instead of a 10 cm 3 measuring cylinder. It is also useful to mention possible extensions to the method used, e.g. a video camera to allow you to work out the volume of gas more accurately every 10 seconds as you could use the freeze-frame facility. Mention the word anomalous .