Which process is an example of a chemical change?

a metal railing rusting in damp weather

a piece of wood shrinking as it dries out

alcohol evaporating from a cotton swab

steam rising from a boiling pot of soup

Chemical Energy is energy stored in the bonds of chemical compounds (atoms and molecules). It is released in a chemical reaction, often producing heat as a by-product (exothermic reaction). Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy.