Chapter 17, Problem 46A

Interpretation Introduction

Interpretation: The difference between endothermic and exothermic processes is to be described.

Concept Introduction: Chemical or physical processes can be distinguished based on whether heat is absorbed by the system or heat lost by the system.

Answer to Problem 46A

The endothermic process involves the absorption of heat whereas the exothermic process involves the release of heat.

Explanation of Solution

Endothermic reactions are those reactions in which heat is absorbed by the system. The heat goes out from the surroundings to the system. The enthalpy change for the endothermic reaction is positive.

Exothermic reactions are those reactions in which heat is released by the system. The heat flows from the system to the surroundings. The enthalpy change for an endothermic reaction is negative.