Balance equations with coefficients only

What you’ll practice

This quiz focuses on balancing chemical equations using coefficients only, so you build the habit of conserving mass without altering formulas.

You’ll see a mix of straightforward and multi-step reactions, helping you get comfortable spotting patterns and checking atom counts efficiently.

Quiz format & difficulty controls

Each question is multiple-choice with 4 options and no timer, so you can work carefully and learn from each attempt.

Choose your preferred question count and difficulty before you start - short sets for quick drills or longer runs for full practice, with mixed difficulty balancing easier items against more complex ones.

Common pitfalls to avoid

Many mistakes come from changing subscripts, forgetting diatomic elements (like O2, N2, Cl2), or balancing one element while accidentally unbalancing another.

A reliable approach is to count atoms on both sides, balance the most complex species first, and finish by reducing coefficients to the lowest whole-number ratio.

Tips for better scores

• Never change subscripts; use coefficients only to adjust counts.
• Balance elements that appear in the fewest compounds first, then leave H and O for last when possible.
• Watch for diatomic elements and polyatomic ions that stay together across the equation.
• Recount every element after you think you’re done - one missed atom can break the whole balance.
• Reduce coefficients to the smallest whole numbers before selecting an option.