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

11.77 Energy Diagrams and Activation Energy Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.77 Energy Diagrams and Activation Energy. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Energy Diagrams and Activation Energy: Interpret reaction coordinate diagrams for reactants, products, transition states, intermediates, activation energy, and overall enthalpy change. 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 - Energy Diagrams and Activation Energy 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 11.77 Energy Diagrams and Activation Energy skill assessments:

Problem 1Difficulty: Mastery

A catalyst is tested in a reaction. The final mixture contains the same products as before, but the reaction reaches completion sooner and the measured heat change per mole is unchanged. Which energy diagram matches this evidence?

ALower product level and the same peak for the catalyzed pathway

BHigher reactant level and higher product level after catalyst is added

CNo transition-state peak and a different DeltaH after catalyst is added

DSame reactant and product levels with a lower peak for the catalyzed pathway

Solution & Explanation:Finishing sooner suggests a lower activation barrier. Unchanged heat change per mole means the reactant-product energy difference remains the same.

Problem 2Difficulty: Mastery

A teacher shows the same reaction-coordinate diagram at 300 K and 350 K. Which feature of the diagram should remain the same for the same pathway?

AThe number of collisions per second

BThe fraction of particles above Ea

CThe activation-energy height of the pathway

DThe average kinetic energy of molecules

Solution & Explanation:For the same pathway, the energy barrier shown on the diagram remains the same. Temperature changes particle energies and collision outcomes, not the pathway's activation energy.

Problem 3Difficulty: Mastery

A reaction diagram shows products much lower than reactants. What can be concluded and what cannot be concluded from that feature alone?

AThe reaction is endothermic, but the exact rate is known.

BThe reaction is exothermic, but the exact rate cannot be determined from that feature alone.

CThe activation energy must be zero, but DeltaH is unknown.

DThe reaction cannot have a catalyst because products are lower.

Solution & Explanation:Lower products indicate negative DeltaH and an exothermic reaction. Rate depends on activation energy and other factors, so it cannot be found from the endpoint drop alone.

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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.).