Free Printable WorksheetScienceGrade 9Science CurriculumNGSS HS-PS1-7

9.35 Balancing Chemical Equations with Coefficients Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Physical Science with Earth and Science Science worksheet provides structured practice on 9.35 Balancing Chemical Equations with Coefficients. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Balancing Chemical Equations with Coefficients: MCQ focus: choose correctly balanced equations, count atoms, and recognize the difference between coefficients and subscripts. Aligned to NGSS high school Physical Science, Earth and Space Science, and Engineering Design; NRC/DCI; SEP/CCC; CCSS math/literacy connections; selected CA NGSS, NYSSLS, Florida CPALMS, and Texas TEKS references NGSS HS-PS1-7 - NGSS-aligned Balancing Chemical Equations with Coefficients: NGSS: HS-PS1-7; NRC/DCI: PS1.B; SEP/CCC: Using mathematics / Energy and matter; Common: HSN-Q.A; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.8; TX IPC matter strand.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Physical Science with Earth and Science

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 9.35 Balancing Chemical Equations with Coefficients skill assessments:

Problem 1Difficulty: Mastery

A proposed equation is 2Al + 3Cl2 -> 2AlCl3. Which reason best shows it is balanced?

AIt has 3 Al atoms and 2 Cl atoms on both sides.

BIt has 2 Al atoms and 6 Cl atoms on both sides.

CIt has equal numbers of formulas on both sides.

DIt uses a coefficient before every substance.

Solution & Explanation:The left side has 2 Al atoms and 3Cl2 gives 6 Cl atoms. The right side has 2AlCl3, giving 2 Al atoms and 6 Cl atoms.

Problem 2Difficulty: Mastery

A student balances C3H8 + O2 -> CO2 + H2O by writing C3H8 + O2 -> C3O2 + H8O. What is the best critique?

AThe equation should remove oxygen from the reactant side.

BOnly the product side needs more plus signs.

CThe student changed subscripts, which changes the substances instead of balancing with coefficients.

DThe equation is correct because atom totals match.

Solution & Explanation:Balanced equations must keep chemical formulas intact. Subscripts define substances; coefficients are the allowed numbers used to conserve atoms.

Problem 3Difficulty: Mastery

Use the equation comparison table in the visual for Ca3(PO4)2 + SiO2 + C -> P4 + CaSiO3 + CO. Which row shows the balanced equation in lowest terms?

ACa3(PO4)2 + 6SiO2 + 10C -> P4 + 6CaSiO3 + 10CO

BCa3(PO4)2 + SiO2 + C -> P4 + CaSiO3 + CO

C4Ca3(PO4)2 + 12SiO2 + 20C -> 2P4 + 12CaSiO3 + 20CO

D2Ca3(PO4)2 + 6SiO2 + 10C -> P4 + 6CaSiO3 + 10CO

Solution & Explanation:The lowest-term balanced equation is 2Ca3(PO4)2 + 6SiO2 + 10C -> P4 + 6CaSiO3 + 10CO; all elements have equal counts and the coefficients share no common factor greater than 1.

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Frequently Asked Questions

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Physical Science with Earth and Science Science students. It aligns with educational standard NGSS HS-PS1-7 (NGSS: HS-PS1-7; NRC/DCI: PS1.B; SEP/CCC: Using mathematics / Energy and matter; Common: HSN-Q.A; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.8; TX IPC matter strand.).