Chemical reactions involve a rearrangement of atoms and the breaking and forming of chemical bonds, which is accompanied by changes in energy. These changes can be classified into two types:
Exothermic Reactions: These are reactions that release energy in the form of heat. The surroundings will feel warmer as a result of this energy release.
Endothermic Reactions: These are reactions that absorb energy from the surroundings in the form of heat. The surroundings will feel cooler as a result of this energy absorption.
Study Guide
Here are some key points to focus on when studying the topic of energy in chemistry:
Understand the different forms of energy and be able to identify examples of each form in chemicalsystems.
By mastering the concept of energy in chemistry, you will be better equipped to understand various topics such as thermodynamics, reaction kinetics, and the behavior of chemicalsystems.
Develop a model to illustrate that the release or absorption of energy from a chemical reaction system depends upon the changes in total bond energy.
Energy
Students who demonstrate understanding can:
Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as either motions of particles or energy stored in fields.