Chemical reactions change what and produce what?

chemical reactions change reactant and produce new substance called products.

Explanation:

chemical reaction is a change which will produce a new substance. (while physical reaction does not produce a new substance.

Chemical reactions changes substances and produces a new different substance.

Explanation:

By the process of chemical reactions, many substances are converted or changed into different compounds as a product. The reactants that cause the change are changed into products of the reaction. They are usually chemical compounds. The reactions organize the atoms of a compound and create other substances.

Examples of chemical reactions are - burning of fuel, pottery, cheese and wine making etc. They are different from physical changes like - ice melting and becoming water.