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

11.83 Gibbs Free Energy and Spontaneity Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.83 Gibbs Free Energy and Spontaneity. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Gibbs Free Energy and Spontaneity: Use DeltaG, DeltaH, DeltaS, and temperature to predict thermodynamic favorability and connect spontaneity to reaction conditions. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, 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 - Gibbs Free Energy and Spontaneity 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 11.83 Gibbs Free Energy and Spontaneity skill assessments:

Problem 1Difficulty: Mastery

A reaction has ΔH = +100 kJ/mol and ΔS = +250 J/(mol·K). Which claim correctly compares 298 K and 500 K?

AIt is favorable at 298 K but not at 500 K because high temperature reduces entropy.

BIt is favorable at both temperatures because ΔS is positive.

CIt is not favorable at either temperature because ΔH is positive.

DIt is not favorable at 298 K but favorable at 500 K because the entropy term is larger at higher temperature.

Solution & Explanation:Convert ΔS to 0.250 kJ/(mol·K). At 298 K, ΔG = 100 - 74.5 = +25.5 kJ/mol. At 500 K, ΔG = 100 - 125 = -25 kJ/mol.

Problem 2Difficulty: Mastery

Use the curves in the image. The Gibbs energy curves for solid and liquid cross at the melting point. What is true at the crossing?

ALiquid has lower Gibbs free energy, so ΔG for melting is negative at every temperature.

BSolid has lower Gibbs free energy, so melting can never occur.

CSolid and liquid have equal Gibbs free energy, so ΔG for melting is 0.

DThe activation energy for melting is zero.

Solution & Explanation:At a phase transition temperature, the two phases are in equilibrium. Equal Gibbs free energies mean ΔG for the phase change is zero.

Problem 3Difficulty: Mastery

At 298 K, compare these reactions: W has ΔH = -10 kJ/mol and ΔS = +20 J/(mol·K); X has ΔH = -40 kJ/mol and ΔS = -80 J/(mol·K); Y has ΔH = +5 kJ/mol and ΔS = +90 J/(mol·K); Z has ΔH = -25 kJ/mol and ΔS = 0. Which has the most negative ΔG?

AReaction W

BReaction Z

CReaction X

DReaction Y

Solution & Explanation:At 298 K, W ≈ -16.0 kJ/mol, X ≈ -16.2 kJ/mol, Y ≈ -21.8 kJ/mol, and Z = -25 kJ/mol. Z is most negative.

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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.).