Five new simple designs of the experimental apparatus for the preparation of hydrogen, oxygen and halogen, electrolysis of water and formation of chemical fountain are described. These new designs use plastic syringes, syringe needles, plastic boxes, three-way plastic stopcocks and small materials. These new designs allow the hydrogen, oxygen ,halogen generated and fountain formated during the experimental processes to be carried out and tested easily, directly, safely, and accurately. With these new simple apparatus, the amounts of chemicals consumed and waste produced during these experiments were greated reduced in comparison with those in the traditional experiments.