Exothermic Reactions
Energy, during a chemical reaction, transfers from one substance, to another to cause a change in the chemical formulas and surrounding area. Endothermic reactions absorb the surrounding heat when the chemical bonds are broken, resulting in the surrounding air and the chemical substance lack heat and appear cold. Exothermic reactions release heat when chemical bonds are formed, causing the chemical substance to heat up and the surrounding air to be considerably warmer. Water, ice, and gas are great examples of both endothermic and exothermic reactions. When water turns from ice to water, then water to gas, that is endothermic reactions because it is absorbing the heat from the surroundings. When it goes the opposite direction, it is exothermic