Exothermic Reactions

An exothermic reaction is a chemical reaction that releases energy in the form of heat. During an exothermic reaction, the energy released is usually in the form of thermal energy, causing the surroundings to become warmer. This is in contrast to endothermic reactions, which absorb energy from the surroundings.

Characteristics of Exothermic Reactions

Release of heat
Temperature increase in the surroundings
Common examples include combustion and neutralization reactions

Energy Diagram of an Exothermic Reaction

In an energy diagram, an exothermic reaction is represented by a starting energy level that is higher than the energy level of the products. The difference in energy, known as the energy change, is released as heat.

Energy Diagram of an Exothermic Reaction" style="width:50%;">

Study Guide

To understand exothermic reactions, it is important to grasp the following concepts:

Identifying exothermic reactions based on temperature change
Understanding energy diagrams and the energy changes associated with exothermic reactions
Recognizing common examples of exothermic reactions in everyday life

When studying exothermic reactions, it is helpful to practice identifying and categorizing different chemical reactions based on their energy changes. Additionally, conducting experiments to observe and measure temperature changes during exothermic reactions can provide practical insight into this topic.

◂Physics Worksheets and Study Guides High School. Work and Energy

The resources above cover the following skills:

PHYSICAL SCIENCE (NGSS)

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.