One place where chemistry is used is in making biscuits. One of the ingredients is baking powder. When you bake the biscuits, the heat causes carbon dioxide to be produced. This causes the volume of the biscuit to increase as it is baked. The following equation is for this reaction.
NaHCO3 + KHC4H4O6 → KNaC4H4O6 + H2O + CO2