Chemical stores of energy
Definition.
Chemical energy is the energy stored in substances that can be released during a chemical reaction.
Where is it stored?
In food.
In fuels.
In batteries.
How is it used?
When chemicals react, the stored energy is released.
That energy can become heat, light, movement, or electricity.
Key Points
Chemical energy is stored in chemical bonds.
It is found in food, fuels, and batteries.
Energy is released during a chemical reaction.
Burning fuels releases chemical energy.
Digesting food releases chemical energy in the body.
Batteries change chemical energy into electrical energy.
Chemical energy can turn into heat, light, or movement.
It is a stored form of energy, not moving energy.
Living things need chemical energy to stay alive.
Chemical energy follows the law of conservation of energy.
What is energy?
Energy is the ability to do work or cause change.
What does energy do?
Energy lets things:
Move.
Heat up.
Light up.
Make sounds.
Change shape or direction.
Examples.
Food gives your body energy.
Electricity gives machines energy.
Sun gives plants energy.
Key Points.
Energy is the ability to do work.
Energy makes things move or change.
Energy cannot be created or destroyed.
Energy can be changed from one form to another.
Energy is needed for life and machines.
The Sun is a main source of energy on Earth.
Energy comes in different forms.
Food gives chemical energy to living things.
Electricity is a useful form of energy.
Everything that happens uses energy.
What is a chemical reaction?
A chemical reaction is when substances change into new substances.
Explanation.
Atoms rearrange.
Old bonds break.
New bonds form.
Energy is released or absorbed.
Why is it important for chemical energy?
Chemical energy is stored in bonds.
During a chemical reaction, that energy is released.
This is how food, fuel, and batteries give energy.
Key Points.
A chemical reaction changes one substance into another.
Chemical bonds break and form during a reaction.
Energy can be released or absorbed.
Chemical energy is stored in bonds.
Burning is a chemical reaction.
Digestion is a chemical reaction.
Batteries work using chemical reactions.
New substances are formed after the reaction.
Reactions can produce heat, light, or electricity.
Chemical reactions are used in everyday life.
Fun fact.
A tiny battery holds chemical energy, but when the chemicals react, it can power big things.