The document discusses combustion reactions and provides examples. Combustion or burning is the exothermic reaction between a fuel and oxidant that produces heat. It requires oxygen, heat, and a fuel as represented by the fire triangle. Examples provided include a stove cooktop which needs these three elements for combustion, and combustion engines which power vehicles by combusting fuel with air to produce motion. NASCAR engines are designed to maximize air intake and combustion for high power output at speed. Nitrous oxide can also be injected to increase combustion in engines. The document concludes with an example of a NASCAR driver being penalized for using an oversized engine not within regulations.