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| Chemical reactions are all ultimately controlled by the energy that is available to them. If a reaction is to occur, there must be an appropriate amount of energy input or output. The products of the reaction must be of lower energy than the reactants so that the reaction process actually produces (or releases) energy. If energy has to be put into the reactants in order for the reaction to proceed forward, this is an endergonic reaction. If energy is released during the reaction process this is termed an exergonic reaction.
In much the same way that a dollar bill is one form of money, heat is a form of energy. In most chemical reactions, heat is the form of energy that is used or produced. Thus, heat (q) is simply one form of energy. Reactions that require an input of heat to proceed forward are called endothermic reactions and those that release heat are called exothermic reactions.
In today’s lab we are going to observe and record data regarding two reactions. The first reaction involves adding KCl to water (H2O). The second reaction will be between KOH and water (H2O).
It will be your job to ascertain whether each of these reactions is endothermic or exothermic based on the change in temperature that occurs when the two substances react.
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