· Energy is always present in a reaction because it is always transferred when chemical bonds are formed or broken.
· Sometimes, the energy is transferred from the reacting chemicals to the surroundings. We call these exothermic reactions. The reaction heats up the surroundings.
· Some reactions, take energy from the surroundings to the reacting chemicals. We call these endothermic reactions. Because they take in energy from their surroundings, these reactions cause a drop in temperature as they happen.
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