Chemistry quiz: Balancing chemical equations

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What this quiz should check

Topic: Balancing chemical equations and conservation of mass (HS-PS1-7). A good Chemistry quiz on this asks students to:

• Explain why a balanced equation shows that atoms, and therefore mass, are conserved
• Balance equations by changing coefficients, never subscripts
• Count atoms on each side, including atoms in parentheses and polyatomic ions
• Use a balanced equation to compare the masses of reactants and products

Misconceptions worth a question

• Changing subscripts to balance an equation, which changes the substance
• Miscounting atoms in formulas with parentheses, such as Ca(OH)2
• Thinking mass is lost when a gas escapes from an open container

Teacher tip: Ask students to show a tally of atoms for each element on both sides. The tally makes errors easy to spot.

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Teach it first

Plan the lesson on the same standard: objective, practice, differentiation and an exit ticket.

Chemistry Balancing chemical equations lesson plan prompt →