I apologize for missing the main question earlier. In a chemistry practical file, the chemical reactions, observations, results and such are typically recorded in a laboratory notebook or on separate sheets of paper, which are then organized and kept in a binder or folder. It is important to record all information in a clear and organized manner so that it can be easily understood and referenced later. The laboratory notebook should be kept up-to-date throughout the course of the experiments, with all data, observations, and results recorded in a timely fashion, and it is important to make sure that the notebook is legible and well-organized.