Free Printable WorksheetScienceGrade 11Science CurriculumNGSS SEPs/CCCs and HS-PS1-1 through HS-PS1-8; CCSS RST.11-12.7-9; HSN-Q.A.1-3; AP Chem Science Practices 1-6

11.140 Energy and Matter Conservation Across Units Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.140 Energy and Matter Conservation Across Units. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Energy and Matter Conservation Across Units: Apply conservation of atoms, charge, energy, and mass across stoichiometry, thermochemistry, electrochemistry, and nuclear chemistry.. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS SEPs/CCCs and HS-PS1-1 through HS-PS1-8; CCSS RST.11-12.7-9; HSN-Q.A.1-3; AP Chem Science Practices 1-6 - Energy and Matter Conservation Across Units Chemistry Standards Crosswalk: National: NGSS SEPs/CCCs and HS-PS1-1 through HS-PS1-8; CCSS RST.11-12.7-9; HSN-Q.A.1-3; AP Chem Science Practices 1-6. State frameworks: Cumulative crosswalk to TX TEKS, CA/NY/NJ NGSS-aligned standards, MA STE, FL NGSSS, GA GSE, and VA SOL Chemistry.

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 11.140 Energy and Matter Conservation Across Units skill assessments:

Problem 1Difficulty: Mastery

Use the concept map comparing chemical reactions, thermochemistry, electrochemistry, and nuclear chemistry. Which statement best summarizes conservation across all four areas?

AAll chemistry topics conserve atoms in exactly the same way and never involve energy transfer.

BElectrochemistry ignores charge because only masses need to balance.

CNuclear equations use coefficients only to balance molecules, not nuclei or charge.

DChemical equations conserve atoms, thermochemistry tracks energy transfer, electrochemistry conserves charge through electron flow, and nuclear equations conserve mass number and atomic number with mass-energy changes.

Solution & Explanation:The conservation target depends on the model: atoms for chemical equations, energy transfer for thermochemistry, electrons and charge for electrochemistry, and nucleon/atomic-number accounting plus mass-energy for nuclear changes.

Problem 2Difficulty: Mastery

Use the beta-plus decay equation display: F-18 -> O-18 + beta+. What conservation statement is correct?

AMass number decreases by 1, and atomic number stays the same.

BAtomic number increases by 1 because a neutron becomes a proton.

CMass number stays 18, and atomic number decreases by 1 as a positron is emitted.

DThe oxygen atom forms by changing electron shells only.

Solution & Explanation:In beta-plus decay, a proton changes into a neutron and a positron. The mass number remains 18, while the atomic number decreases from 9 to 8.

Problem 3Difficulty: Mastery

Use the thermo-stoichiometry table for 2NO(g) + O2(g) -> 2NO2(g), Delta H = -114 kJ. If 0.300 mol NO reacts with excess O2, which pair is correct?

A0.150 mol NO2 forms, and 17.1 kJ is released.

B0.300 mol NO2 forms, and 17.1 kJ is released.

C0.300 mol NO2 forms, and 114 kJ is released.

D0.600 mol NO2 forms, and 34.2 kJ is absorbed.

Solution & Explanation:The 2:2 ratio means moles NO2 formed equal moles NO consumed: 0.300 mol. The reaction as written uses 2 mol NO and releases 114 kJ, so 0.300 mol NO releases 0.300/2 x 114 = 17.1 kJ.

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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 SEPs/CCCs and HS-PS1-1 through HS-PS1-8; CCSS RST.11-12.7-9; HSN-Q.A.1-3; AP Chem Science Practices 1-6 (National: NGSS SEPs/CCCs and HS-PS1-1 through HS-PS1-8; CCSS RST.11-12.7-9; HSN-Q.A.1-3; AP Chem Science Practices 1-6. State frameworks: Cumulative crosswalk to TX TEKS, CA/NY/NJ NGSS-aligned standards, MA STE, FL NGSSS, GA GSE, and VA SOL Chemistry.).