大象传媒

Chemical reactions are useful in cooking and help to improve the taste of food. Cooking and chemistry have quite a bit in common. The starting materials in a chemical reaction are called the reactants. These react with each other to form a completely new substance known as the product. Products have very different properties to the reactants. Cakes are firmer and taste better than the individual reactants. The colour is different too. Not all chemical reactions need heat energy to make them happen. When bicarbonate of soda and vinegar are mixed, the chemical reaction produces a gas.