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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
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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.
Check out the Full Lesson on Chemical Reactions
In this lesson, we learn that:
- When substances undergo chemical reactions their properties change.
- The total number of atoms does not change throughout a chemical reaction.
- Scientists use chemical reactions to create new materials and medicines.
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