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What Is Chemical Energy?

A man filling up his gas tank. Gasoline is a form of chemical energy.
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  • Written By: Victoria Blackburn
  • Edited By: Bronwyn Harris
  • Last Modified Date: 06 September 2014
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Scientifically, energy is defined as the ability to do work. While there are many forms of energy, they can be grouped into two categories: potential energy, or stored energy; and kinetic energy, or energy of motion. Chemical energy is a form of potential energy and it is possessed by things such as food, fuels and batteries.

Within each category of energy, there are many different forms of energy. Chemical energy is one form of potential energy, along with mechanical energy, gravitational energy, nuclear energy and electrical energy. All of these forms of energy are stored within an object and are converted to forms of kinetic energy when a force or change is applied. The different forms of kinetic energy are radiant energy, which includes light, x-rays and radio waves, heat, motion and sound.

As stated by the first law of thermodynamics, energy can neither be created nor destroyed; it can only be converted from one form to another. During chemical reactions, molecules can be created or destroyed. If a product is created, the chemical energy is stored in the bonds that make up the molecules. If something is broken down, the chemical energy is released, usually as heat. If a reaction releases energy, it is called exothermic, and if it absorbs energy, it is called endothermic.

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One example of chemical energy is that found in the food that we eat. Energy is stored in the bonds of the molecules that make up food. When we eat the food, the large molecules are broken down into smaller molecules that can be used by the cells of the body. The process of breaking down and using the food by our cells is called respiration. During respiration, the chemical energy is converted to heat, kinetic energy, and other forms of chemical energy, like that stored in the fat cells in our body.

Food is just one example of a fuel — it is how animals, including humans, fuel their bodies. Other forms of fuel include wood and chemicals, such as petroleum. When wood is burned, the chemical energy within the cells of the wood break and heat is released. In the engine of a car or truck, the energy in the gasoline is converted to heat and motion, to make the car move.

Kinetic energy can also be converted to potential energy. During the process of photosynthesis carried out by plants, radiant energy, or the light from the sun, is converted into chemical energy, which is stored within the plant. When animals eat the plants, the reverse reaction takes place. The bonds are broken, which releases the stored chemical energy for the animals to use.

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Discuss this Article

anon336335
Post 53

I want to know how energy is released from chocolate.

anon303774
Post 49

What are some pros and cons of chemical energy?

anon302975
Post 48

Stored chemical energy is also found in food that animals and humans eat.

anon269136
Post 39

Wouldn't it be a good idea to harness some food in jars?

anon263447
Post 37

What are some benefits we humans have on chemical energy?

anon233387
Post 30

chemical energy can be used by making fireworks.

anon167895
Post 24

I wished it said more about it. Like what's the price of Chemical Energy, the uses of it and how is it developing in our world's life movement! Overall, this is a great site! Its a shame i didn't find what i was looking for.

anon163965
Post 23

is chemical energy renewable?

anon147601
Post 18

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anon134296
Post 15

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Pro tip: Cool and awesome are not the top two adjectives teens would use to describe a site that merely provides information. These words are generally dished out to sites with visual stimulus (i.e. games and videos.)

That being said, it really did help me understand concepts better than wikipedia.

Moderator's reply: Thank you for visiting wiseGEEK and for contributing to the discussion. We do not have an age limit for posting, and students often come to these pages for information on assignments, so we expect to see a lot of teenspeak on the forums. We do, however, edit out all the textspeak, since it can make reading and understanding posts extremely difficult.

Thanks again for visiting!

anon90794
Post 10

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anon77696
Post 6

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anon68128
Post 3

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anon68127
Post 2

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mendocino
Post 1

As stated in the article, using food to produce energy is one form of chemical energy.

By this process our bodies break down the "fuel" and create energy that is used for movement or breathing or all the other bodily actions .

But not all of it is turned into useful energy, actually only a small percentage is used. The rest is wasted in heat form.

Wouldn't it be a good idea to harness some of that heat and power something lets say a cell phone?

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