1) The energy held in the molecules that your lunch is composed of

Chemical energy

Explanation:

The energy held in the foods molecules a lunch pack is composed of is chemical energy.

They occur within food substances which originates from plants and animals as giant organic molecules.

Since food is often derived from plants and animals. Plants produce their own food by producing macromolecules from simple inorganic substances in the environment. Animals takes up these food and build their own body through it. Plants and animal parts constitutes organic molecules in which chemical energy is duly stored. When the molecules are broken down, they released their chemical potential energy into heat energy.