The MEL Chemistry boxes let you experiment with simple chemical reactions.The sets are meant to excite children about chemistry.Using a pile of sugar and baking soda, children can create a burning sugar snake.Having mixed baking soda (NaHCO3 ) and sugar to a ratio of 4:1, the powder can then be set alight using solid fuel.The snake starts to grow and, in some cases, can get up to 50cm long.