Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6

11.60 Balancing Equations and Conservation of Mass Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.60 Balancing Equations and Conservation of Mass. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Balancing Equations and Conservation of Mass: Balance chemical equations and connect coefficients to atom conservation, molecule ratios, and mole ratios. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6 - Balancing Equations and Conservation of Mass Chemistry Standards Crosswalk: National: NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6. State frameworks: TX TEKS 112.43(c)(9), (11), (12); FL SC.912.P.8.7-8.10; MA HS-PS1-9(MA), HS-PS1-10(MA); CA/NY/NJ HS-PS1-7; GA/VA reaction and stoichiometry standards.

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

Chemistry

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 11.60 Balancing Equations and Conservation of Mass skill assessments:

Problem 1Difficulty: Mastery

In N2 + 3H2 -> 2NH3, the number of gas molecules decreases from 4 to 2. Why does this not violate conservation of mass?

AMass conservation applies only to solids, not gases.

BNitrogen atoms disappear when ammonia forms.

CThe equation is unbalanced because molecule counts differ.

DThe number of atoms is conserved even though the number of molecules changes.

Solution & Explanation:Balanced equations conserve atoms, not necessarily the total number of molecules. Here 2 N atoms and 6 H atoms appear on both sides.

Problem 2Difficulty: Mastery

Which coefficient set balances Mg3N2 + H2O -> Mg(OH)2 + NH3?

A1, 3, 3, 2

B2, 6, 3, 2

C1, 6, 3, 2

D1, 6, 2, 3

Solution & Explanation:One Mg3N2 has 3 Mg atoms and 2 N atoms, so products are 3Mg(OH)2 and 2NH3. That requires 6H2O to supply 6 O and 12 H atoms.

Problem 3Difficulty: Mastery

Use the particle diagram showing 6 Na atoms and 3 Cl2 molecules before reaction. For 2Na + Cl2 -> 2NaCl, how many NaCl formula units form?

Solution & Explanation:The diagram shows three complete sets of 2Na + Cl2. Each set forms 2NaCl, so three sets form 6NaCl.

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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 Chemistry Science students. It aligns with educational standard NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6 (National: NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6. State frameworks: TX TEKS 112.43(c)(9), (11), (12); FL SC.912.P.8.7-8.10; MA HS-PS1-9(MA), HS-PS1-10(MA); CA/NY/NJ HS-PS1-7; GA/VA reaction and stoichiometry standards.).