Which of the following options correctly describes an exothermic reaction?

• A. A reaction that causes the temperature of the surroundings to decrease
• B. A reaction in which the products have higher enthalpy than the reactants
• C. A reaction that releases heat to its surroundings
• D. A reaction that absorbs heat from its surroundings

Answer: (C)

Verified step by step guidance

1. Understand the definition of an exothermic reaction: it is a chemical reaction that releases heat to its surroundings.
2. Recall that in an exothermic reaction, the enthalpy of the products is lower than that of the reactants because energy is released.
3. Recognize that releasing heat to the surroundings causes the temperature of the surroundings to increase, not decrease.
4. Compare the options given: the correct description should mention heat release, not heat absorption or temperature decrease.
5. Conclude that the option stating 'A reaction that releases heat to its surroundings' correctly describes an exothermic reaction.