Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-4; AP Chem Units 6 and 9; CCSS HSN-Q.A.1-3 and HSA-CED.A.1-4

11.81 Bond Energies and Enthalpy of Reaction Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.81 Bond Energies and Enthalpy of Reaction. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Bond Energies and Enthalpy of Reaction: Estimate reaction enthalpy from bond energies and compare energy required to break bonds with energy released forming bonds. Aligned to NGSS, AP Chemistry, CCSS, and representative state chemistry framework crosswalks NGSS HS-PS1-4; AP Chem Units 6 and 9; CCSS HSN-Q.A.1-3 and HSA-CED.A.1-4 - Bond Energies and Enthalpy of Reaction Chemistry Standards Crosswalk: National: NGSS HS-PS1-4; AP Chem Units 6 and 9; CCSS HSN-Q.A.1-3 and HSA-CED.A.1-4. State frameworks: TX TEKS 112.43(c)(13); FL SC.912.P.10.4, P.10.6; MA/CA/NY/NJ HS-PS1 energy standards; GA and VA thermochemistry/energy 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

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Below are sample questions representative of the exercises included on this worksheet and related 11.81 Bond Energies and Enthalpy of Reaction skill assessments:

Problem 1Difficulty: Mastery

Estimate Delta H for CO(g) + 3H2(g) -> CH4(g) + H2O(g). Bond energies: C≡O in CO = 1072, H-H = 436, C-H = 413, O-H = 463 kJ/mol.

A+198 kJ/mol reaction

B-2,380 kJ/mol reaction

C+2,578 kJ/mol reaction

D-198 kJ/mol reaction

Solution & Explanation:Break C≡O and three H-H bonds: 1072 + 3(436) = 2,380 kJ. Form four C-H and two O-H bonds: 4(413) + 2(463) = 2,578 kJ. Delta H = -198 kJ/mol reaction.

Problem 2Difficulty: Mastery

Reaction A has bond-breaking total 840 kJ/mol and bond-forming total 940 kJ/mol. Reaction B has bond-breaking total 760 kJ/mol and bond-forming total 720 kJ/mol. Which conclusion is correct?

AReaction A is endothermic by 100 kJ/mol; Reaction B is exothermic by 40 kJ/mol

BBoth reactions are exothermic because both involve bond formation

CReaction A is exothermic by 100 kJ/mol; Reaction B is endothermic by 40 kJ/mol

DBoth reactions are endothermic because both involve bond breaking

Solution & Explanation:Reaction A: 840 - 940 = -100 kJ/mol. Reaction B: 760 - 720 = +40 kJ/mol.

Problem 3Difficulty: Mastery

Bond energies estimate N2(g) + 3H2(g) -> 2NH3(g) as -93 kJ per reaction as written. If N2 is in excess and exactly 1.00 mol H2 reacts, what is q?

A+31 kJ

B-31 kJ

C-93 kJ

D-279 kJ

Solution & Explanation:The equation uses 3 mol H2 for -93 kJ, so 1.00 mol H2 corresponds to (-93 kJ)/3 = -31 kJ.

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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-PS1-4; AP Chem Units 6 and 9; CCSS HSN-Q.A.1-3 and HSA-CED.A.1-4 (National: NGSS HS-PS1-4; AP Chem Units 6 and 9; CCSS HSN-Q.A.1-3 and HSA-CED.A.1-4. State frameworks: TX TEKS 112.43(c)(13); FL SC.912.P.10.4, P.10.6; MA/CA/NY/NJ HS-PS1 energy standards; GA and VA thermochemistry/energy standards.).