A commercially sold ‘heat pad’ includes iron, activated carbon and water. When air activates the ‘heat pad’, its temperature rises. Which statement describes the chemical reaction taking place in the ‘heat pad’ when it is exposed to air?
- AThe reaction is endothermic and iron gains electrons.
- BThe reaction is endothermic and iron loses electrons.
- CThe reaction is exothermic and iron gains electrons.
- DThe reaction is exothermic and iron loses electrons.