Why Is Energy Involved In A Chemical Change?

PPT Physical and Chemical Properties of Matter PowerPoint

Chemical changes are all around us, from burning wood in a campfire to baking a cake. During these processes, energy is involved, but why is it important? In this article, we will explore the role of energy in a chemical change.

What is a Chemical Change?

A chemical change is a process that results in the formation of a new substance with different properties than the original substance. This can happen through various reactions, such as combustion, oxidation, and decomposition.

Types of Energy Involved in Chemical Changes

There are two types of energy involved in chemical changes: potential energy and kinetic energy. Potential energy is the energy stored in a substance due to its position, while kinetic energy is the energy of motion.

How Energy is Involved in Chemical Changes

During a chemical change, energy is either absorbed or released. This is known as an endothermic or exothermic reaction, respectively. In an endothermic reaction, energy is absorbed from the surroundings, causing the temperature to decrease. In an exothermic reaction, energy is released into the surroundings, causing the temperature to increase.

Examples of Endothermic Reactions

One example of an endothermic reaction is an ice pack. When you break the inner pouch, the chemicals inside react, absorbing heat energy from the surroundings and causing the pack to become cold.

Examples of Exothermic Reactions

An example of an exothermic reaction is a campfire. When wood is burned, the chemical bonds in the wood are broken, releasing energy in the form of heat and light.

Why Energy is Important in Chemical Changes

Energy is important in chemical changes because it determines whether a reaction will occur and how much energy will be involved. If a reaction requires more energy than it releases, it will not occur spontaneously.

Energy and Reaction Rates

Energy also affects the rate at which a reaction occurs. Higher energy levels typically result in faster reactions, while lower energy levels result in slower reactions.

Applications of Energy in Chemical Changes

The understanding of energy in chemical changes has many practical applications. For example, it is used in the design of chemical processes, such as the production of fertilizers and plastics.


In conclusion, energy plays a critical role in chemical changes. It determines whether a reaction will occur and how much energy will be involved. By understanding the types of energy involved and how they affect reactions, we can better understand the world around us and develop new technologies.