Free Printable WorksheetScienceGrade 9Science CurriculumNGSS HS-PS1-4, HS-PS3-2

9.38 Energy in Reactions Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Physical Science with Earth and Science Science worksheet provides structured practice on 9.38 Energy in Reactions. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Energy in Reactions: MCQ focus: distinguish exothermic and endothermic processes using temperature data, energy diagrams, and everyday examples. Aligned to NGSS high school Physical Science, Earth and Space Science, and Engineering Design; NRC/DCI; SEP/CCC; CCSS math/literacy connections; selected CA NGSS, NYSSLS, Florida CPALMS, and Texas TEKS references NGSS HS-PS1-4, HS-PS3-2 - NGSS-aligned Energy in Reactions: NGSS: HS-PS1-4; HS-PS3-2; NRC/DCI: PS1.B; PS3.A; SEP/CCC: Models / Energy and matter; Common: HSN-Q.A; RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.10; TX IPC energy strand.

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

Physical Science with Earth and Science

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 9.38 Energy in Reactions skill assessments:

Problem 1Difficulty: Mastery

A reaction model shows products lower than reactants, the surrounding water warms, and bond formation releases more energy than bond breaking absorbs. Which conclusion is most consistent?

AThe reaction is exothermic, and multiple pieces of evidence support energy transfer to the surroundings.

BThe reaction is endothermic, because lower products always require energy input.

CThe reaction is endothermic, because warming water means the system gained energy.

DThe reaction cannot be classified because diagram, temperature, and bond evidence cannot be combined.

Solution & Explanation:All three pieces of evidence point to the same conclusion: lower products, warmer surroundings, and greater energy release during bond formation indicate an exothermic reaction.

Problem 2Difficulty: Mastery

Use the graph comparing Processes JJ and KK. JJ rises by 3 degrees C in a small sample, while KK drops by 3 degrees C in a similar sample. Which claim focuses on classification rather than size?

ANeither can be classified because the magnitudes are equal.

BJJ and KK release the same energy because both changes are 3 degrees C.

CJJ is exothermic and KK is endothermic because the temperature changes are in opposite directions.

DJJ is endothermic and KK is exothermic because equal changes cancel.

Solution & Explanation:For classification, the direction of temperature change matters most when the setups are similar. A rise indicates energy release to surroundings; a drop indicates energy absorption.

Problem 3Difficulty: Mastery

In a calorimeter, a reaction warms the water, but some released energy is also absorbed by the calorimeter walls. What classification is still supported?

AEndothermic, because the calorimeter walls absorb some energy.

BExothermic, because energy leaves the reaction system and enters the water and calorimeter.

CNeither, because calorimeters prevent energy accounting.

DEndothermic, because not all energy stays in the water.

Solution & Explanation:The water and calorimeter are surroundings for the reaction system. If they gain energy from the reaction, the reaction is exothermic even if the energy is split among surroundings.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Physical Science with Earth and Science Science students. It aligns with educational standard NGSS HS-PS1-4, HS-PS3-2 (NGSS: HS-PS1-4; HS-PS3-2; NRC/DCI: PS1.B; PS3.A; SEP/CCC: Models / Energy and matter; Common: HSN-Q.A; RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.10; TX IPC energy strand.).