Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-5; AP Chem Unit 5; CCSS HSS-ID and HSA-CED.A

11.93 Catalysts and Reaction Pathways Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.93 Catalysts and Reaction Pathways. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Catalysts and Reaction Pathways: Explain how catalysts alter mechanisms and lower activation energy without changing overall reaction enthalpy or equilibrium position. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-5; AP Chem Unit 5; CCSS HSS-ID and HSA-CED.A - Catalysts and Reaction Pathways Chemistry Standards Crosswalk: National: NGSS HS-PS1-5; AP Chem Unit 5; CCSS HSS-ID and HSA-CED.A. State frameworks: TX TEKS reaction-rate expectations; FL SC.912.P.8.8 connections; CA/NY/NJ HS-PS1-5; MA chemistry reaction-rate standards; GA/VA kinetics 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 11.93 Catalysts and Reaction Pathways skill assessments:

Problem 1Difficulty: Mastery

Which generalization best matches the Grade 11 chemistry skill of catalysts and reaction pathways?

ACatalysts make products more stable by lowering delta H and increasing K.

BCatalysts stop reverse reactions so equilibrium always shifts to products.

CCatalysts work only by adding heat, so they cannot participate in mechanisms.

DCatalysts alter mechanisms and lower activation energy without changing overall reaction enthalpy or equilibrium position.

Solution & Explanation:This statement captures the central idea: catalysts change pathways and rates, but not the thermodynamic endpoints or equilibrium position for the same reaction.

Problem 2Difficulty: Mastery

Use the catalytic-cycle diagram. Which net reaction and catalyst identification are correct?

AA + C -> AC is the net reaction, and AB is the catalyst because it appears last.

BAC + B -> ABC is the net reaction, and C is the product because it appears in the final panel.

CA + B -> AB is the net reaction, and C is the catalyst because it is regenerated.

DA + B + C -> AB + C is invalid because catalysts cannot appear in any elementary step.

Solution & Explanation:Adding the steps cancels C and the intermediates, leaving A + B -> AB. C is present at the beginning and regenerated at the end.

Problem 3Difficulty: Mastery

An uncatalyzed reaction has forward Ea = 70 kJ/mol and delta H = -10 kJ/mol. A catalyst lowers the transition-state energy by 30 kJ/mol without changing reactants or products. Which values describe the catalyzed pathway?

AForward Ea = 70 kJ/mol and reverse Ea = 80 kJ/mol.

BForward Ea = 40 kJ/mol and reverse Ea = 50 kJ/mol.

CForward Ea = 40 kJ/mol and reverse Ea = 30 kJ/mol.

DForward Ea = 30 kJ/mol and reverse Ea = 10 kJ/mol.

Solution & Explanation:Lowering the transition state by 30 kJ/mol changes forward Ea from 70 to 40. Since products are 10 kJ/mol lower than reactants, the reverse barrier is 40 + 10 = 50 kJ/mol.

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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-PS1-5; AP Chem Unit 5; CCSS HSS-ID and HSA-CED.A (National: NGSS HS-PS1-5; AP Chem Unit 5; CCSS HSS-ID and HSA-CED.A. State frameworks: TX TEKS reaction-rate expectations; FL SC.912.P.8.8 connections; CA/NY/NJ HS-PS1-5; MA chemistry reaction-rate standards; GA/VA kinetics standards.).