7. Acknowledgment

This research is carried out by Shaquille, Wun Juan and Ibrahim, ISS Team D. We would also like to express our appreciation to our Science Teacher, Mr Charles Low, who guided us for the whole project, and also gave us many tips, support and guidance for the report and the experiment.  Secondly, we want to thank Miss Su and Mr Tan Hoe Teck, which both helped us to get our lab equipments and materials. Without their help, experiment would not be a success.