Simple Chemical Reactions in Fireworks

The color of fireworks depends on their constituent elements.
••• Fireworks image by Dazzler from

The amazing colors in exploding fireworks come from chemical reactions triggered by heat. Combustion propels fireworks into the air while oxidization provides the oxygen needed to excite the metal compounds in fireworks. Energy absorption and emission produce fireworks' unique color spectra.


Combustion occurs when the flame from a firework's fuse comes into contact with black powder, causing potassium nitrate, charcoal, and sulfur to combine. The combustion is highly exothermic (heat-producing). In most fireworks the heat and gas are forced out of the bottom of the firework shell, propelling the firework up into the sky.


Once a firework has reached its apex in the sky, the fuse reaches a compartment filled with an oxidizing agent and light-producing stars. Common oxidizing agents include nitrates, chlorates, and perchlorates. The oxidizing agents react with the heat and gas formed by combustion to produce enough oxygen for rapid combustion of the light- and sound-producing agents in the stars.

Energy Absorption/Emission

The oxygen produced by the oxidizing agents reacts with the elements in the stars to produce a hot, rapidly expanding gas. The atoms in this gas absorb the energy produced in the reaction, causing their electrons to move from their stable ground state to an excited energy state. When the electrons return to their ground state, they emit energy in the form of light. The color of the light depends on the type of element in the stars.

Related Articles

2 Ways to Excite Electrons Into High Energy States
Chemical Reactions That Produce Light
What Elements Glow in the Dark?
Stages in the Life Cycle of a Star
How Are Elements Formed in Stars?
How to Use Planck's Constant
Importance of Hydrogen
What Is the Chemical Composition of Most Stars?
Why Is the Sun So Bright?
What Is the Life Cycle of a Large Star?
Life Cycle of a Medium-Sized Star
Facts About the Sun's Core
How to Get Colored Lighter Flames
What Kind of Stars Live the Longest?
Chemical Reactions That Produce Light
What Are the Colors of Neon?
7 Main Stages of a Star
How is the Sun Nuclear Energy?
What Causes Atmospheric Heating?
2 Ways to Excite Electrons Into High Energy States

Dont Go!

We Have More Great Sciencing Articles!