Answer:
If the temperature changes in a chemical reaction, it means that the reaction is either endothermic or exothermic.
Step-by-step explanation:
An endothermic reaction is one that absorbs heat from its surroundings, causing the temperature to decrease. In an endothermic reaction, energy is absorbed as reactants are converted into products. An example of an endothermic reaction is the reaction between baking soda and vinegar, which absorbs heat and causes the temperature to decrease.
On the other hand, an exothermic reaction is one that releases heat to its surroundings, causing the temperature to increase. In an exothermic reaction, energy is released as reactants are converted into products. An example of an exothermic reaction is the combustion of gasoline in a car engine, which releases heat and causes the temperature to increase.
Therefore, the direction of the temperature change in a chemical reaction can provide important information about the nature of the reaction and the energy changes that are occurring.