Worksheet Library

Loading Lesson Content...

© 2025 StillyMathPro. All rights reserved.

Advanced math education, serving students around the world.

Free Worksheets/Chemistry/Balancing Chemical Reactions

Free Balancing Chemical Reactions Lesson

Practice Balancing Chemical Reactions concepts in Chemistry. Step-by-step lessons to reinforce learning and understanding.

100% FreeInstant Access

Ready to Practice?

Lesson 1: Balancing Chemical Reactions

Balancing Chemical Reactions

In this lesson, we will learn how to balance chemical reactions, ensuring that the law of conservation of mass is obeyed. A balanced chemical equation has the same number of each type of atom on both sides of the equation.

Steps to Balance a Chemical Equation

Write the unbalanced equation.
Count the number of atoms of each element on both sides.
Use coefficients to balance the atoms one element at a time, adjusting as necessary.
Check your work to ensure that all elements are balanced.

Example: Balancing the Reaction of Hydrogen and Oxygen to Form Water

Unbalanced equation: $H_{2} + O_{2} \rightarrow H_{2}O$

Keywords: Balancing, Coefficients, Conservation of mass, Reactants, Products

Previous Lesson

Mixed Practice Ranking

Free Downloadable PDF

Want More Practice?

Check out our interactive digital modules with timed practice and instant feedback.

Or Digital Version

More Chemistry Worksheets

Browse our complete collection of Chemistry worksheets covering all topics in chemical reactions and beyond.

View All Chemistry Worksheets →

2

→

H2O

Count atoms:

Left: $2 H, \ 2 O$
Right: $2 H, \ 1 O$

Balance O by adding a coefficient of 2 in front of $H_{2}O$ : $H_{2} + O_{2} \rightarrow 2H_{2}O$

Count atoms again:

Left: $2 H, \ 2 O$
Right: $4 H, \ 2 O$

Balance H by adding a coefficient of 2 in front of $H_{2}$ : $2H_{2} + O_{2} \rightarrow 2H_{2}O$

Final check:

Left: $4 H, \ 2 O$
Right: $4 H, \ 2 O$

The equation is now balanced!

Key Questions

What is the law of conservation of mass?
Why is it important to balance chemical equations?
How do coefficients differ from subscripts in a chemical equation?

Keywords

Balancing
Coefficients
Conservation of mass
Reactants
Products