Balancing Equation Practice for Chemistry Classes

About this resource

What's inside this resource

Thirty-five unbalanced chemical equations — covering single and double replacement, synthesis, and combustion reactions with formulas such as AlBr3 + K to KBr + Al and C7H6O2 + O2 to CO2 + H2O — are presented across two problem sets for students to balance by filling in blank coefficients. The first set of 15 equations and the second set of 20 equations are each followed immediately by a fully worked answer key showing the correct coefficient for every reactant and product. Students apply conservation of mass and trial-and-error coefficient balancing to make the number of atoms of each element equal on both sides of the arrow. The document is a single worksheet file intended for direct printing or digital completion in a high school or advanced middle school chemistry class. Once equations are balanced, the same stoichiometry foundation extends to mole conversion problems.

In the classroom

Teaching tips & learning objectives

Learning objectives

Balance chemical equations by adjusting coefficients so atoms are conserved.
Apply the law of conservation of mass to reaction equations.
Identify reactants and products in synthesis, replacement, and combustion reactions.

Teaching tips

Assign Set 1 (15 problems) before Set 2 (20 problems), since Set 2 introduces more complex polyatomic-ion equations.
Use the built-in answer key for student self-checking or quick teacher grading.
Review the trial-and-error balancing method with a simple example before assigning the full worksheet.

Skills covered

Chemical equation balancing — students determine coefficients so atom counts match on both sides of 35 reaction equations.
Conservation of mass application — students apply the law of conservation of mass to single/double replacement, synthesis, and combustion reactions.
Chemical formula reading — students interpret polyatomic-ion formulas (e.g., Ca(NO3)2, K2SO4) while balancing equations.

Good to know

Questions teachers ask about this resource

How do the two problem sets in this file differ in difficulty?

The first set of 15 equations uses simpler binary compounds, while the second set of 20 equations introduces polyatomic ions and multi-step reactions such as hydrocarbon combustion.

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Resource details

Concepts & topics

Core concepts

chemical equation balancing
conservation of mass
stoichiometry basics

Topics

balancing equations chemistry practice chemistry balancing equations practice equations chemical reactions chemistry

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Balancing Equations Practice – 35 Chemistry Problems

What's inside this resource