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

11.79 Enthalpy and Thermochemical Equations Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.79 Enthalpy and Thermochemical Equations. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Enthalpy and Thermochemical Equations: Write and interpret thermochemical equations, molar enthalpy values, and heat changes proportional to reaction amount. 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 - Enthalpy and Thermochemical Equations 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

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 11.79 Enthalpy and Thermochemical Equations skill assessments:

Problem 1Difficulty: Mastery

For A + 2B -> C, Delta H = -84.0 kJ. If a reaction consumes 0.500 mol B with excess A, what is q?

A-42.0 kJ

B+21.0 kJ

C-84.0 kJ

D-21.0 kJ

Solution & Explanation:The equation ties -84.0 kJ to 2 mol B. Consuming 0.500 mol B is 0.250 reaction unit, so q = 0.250(-84.0) = -21.0 kJ.

Problem 2Difficulty: Mastery

For C2H5OH(l) + 3O2(g) -> 2CO2(g) + 3H2O(l), Delta H = -1367 kJ. What is q for burning 0.215 mol ethanol, reported to three significant figures?

A-293.905 kJ

B+294 kJ

C-294 kJ

D-6360 kJ

Solution & Explanation:q = 0.215(-1367) = -293.905 kJ. With three significant figures from 0.215, the result is -294 kJ.

Problem 3Difficulty: Mastery

Methane combustion releases 890 kJ per 16.0 g CH4, while propane combustion releases 2220 kJ per 44.0 g C3H8. Which fuel releases more heat per gram based on these values?

AC3H8, about 50.5 kJ/g

BCH4, about 55.6 kJ/g

CThey are equal at about 53.0 kJ/g

DCH4, about 18.0 kJ/g

Solution & Explanation:For methane, 890/16.0 = 55.6 kJ/g. For propane, 2220/44.0 = 50.5 kJ/g. Methane is larger per gram from the given data.

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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.).