The Dance of Molecules
An interactive guide to the five main types of chemical reactions.
This tutorial builds on our understanding of chemical bonds.
← Go back to see how atoms connect.
1. Synthesis (A + B → AB)
The simplest type of reaction. Two or more simple substances combine to form a more complex product. Think of it as building something new.
Click "Combine" to see two elements form a new compound.
2. Decomposition (AB → A + B)
The opposite of synthesis. A complex molecule breaks down to make simpler ones. Think of it as taking something apart.
Click "Decompose" to see a compound break apart.
3. Single Replacement (A + BC → AC + B)
One element trades places with another element in a compound. Think of it as a more reactive element "cutting in" and displacing a less reactive one.
Click "React" to see the replacement happen.
4. Double Replacement (AB + CD → AD + CB)
The positive and negative ions of two ionic compounds switch places to form two new compounds. Think of it as two dancing couples swapping partners.
Click the button to see the partner swap.
5. Combustion
A rapid reaction between a substance and an oxidant, usually oxygen, to produce heat and light. The classic example is the burning of a hydrocarbon like methane (CH₄) to produce carbon dioxide (CO₂) and water (H₂O).
Click "Ignite" to see the combustion of methane.
You've Mastered the Dance. What's Next?
You now understand the fundamental ways molecules interact. The next step is to meet the full cast of characters: the elements themselves, organized in the beautiful and powerful Periodic Table.