Processing, please wait...
It was processed successfully!
It was processed successfully!
Login Create Free Account
Create Free Account

Chemical Reaction Definition

A chemical reaction is where substances rearrange to form new substances with different properties. For example, reactants regroup atoms to create distinct products.

View Lesson on Chemical Reactions
Grades 6-8 VideoChemical Reactions player orange
Preview Only
Oops! It looks like your security settings are blocking this video 🙁

If you are on a school computer or network, ask your tech person to whitelist these URLs:
*.wistia.com, fast.wistia.com, fast.wistia.net, embedwistia-a.akamaihd.net

Sometimes a simple refresh solves this issue. If you need further help, contact us.


Chemical Reactions

Fun Facts

  • Testing the properties of magnetism, flammability, electricity, density, and odor before and after a chemical reaction help determine if a new substance was formed.
  • Lighting a gas grill requires a chemical reaction in which atoms are rearranged.
  • When iron combines with oxygen in a chemical reaction, it is no longer flammable because its properties have changed.

Why Do We Need To Know About Chemical Reaction

Learning about chemical reactions helps you understand the world better. Scientists use these reactions to make new materials and medicines. This knowledge is important for science and is used in real life too.

Chemical reactions are behind everything from how our food is digested to how rockets fly. They help create new things like bendy solar panels and make rocket fuel better. Knowing about chemical reactions helps people like chemical engineers and material scientists fix problems and come up with new ideas, showing how chemistry is used to solve problems and make new things.

Frequently Asked Questions

How is a physical change different from a chemical change?
In a physical change, no new substances are formed. In a chemical change, new substances are formed.
How do you know a chemical reaction has happened?
If a new substance is formed, it has different properties.
Give an example of a chemical change.
Steel wool burning, which causes the iron to combine with oxygen and form iron oxide.
Explore More Science Topics
We’ve sent you an email with instructions how to reset your password.
Choose Your Free Trial Period
3 Days

3 days to access to all of our teaching resources for free.

Continue to Lessons
30 Days

Get 30 days free by inviting other teachers to try it too.

Share with Teachers
Get 30 Days Free
By inviting 4 other teachers to try it too.
4 required

*only school emails accepted.

Skip, I will use a 3 day free trial

Thank You!

Enjoy your free 30 days trial