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8th Grade Science
Chemical Reactions
9. Types
9.2 Energy Changes, Endothermic and exothermic
Endothermic vs. Exothermic Reactions: Where Does the Energy Go?
Discover how chemical reactions either absorb or release energy, and learn to identify each type using real-world examples, energy diagrams, and key vocabulary.
What You'll Learn
Exothermic reactions release heat, warming the surrounding environment noticeably.
Endothermic reactions absorb heat, causing surrounding temperatures to decrease significantly.
Activation energy is required to start both endothermic and exothermic chemical reactions.
Energy diagrams and enthalpy changes reveal whether reactions absorb or release energy.
What You'll Practice
1
Students identify endothermic and exothermic reactions using observable temperature changes.
2
Learners analyze energy diagrams and classify reactions using enthalpy change values.
3
Practice connects real-world examples like cold packs and photosynthesis to concepts.
Why This Matters
Understanding endothermic and exothermic reactions equips students to explain everyday phenomena from cold packs and hand warmers to photosynthesis and combustion and builds essential foundations for advanced chemistry and physical science.
This Unit Includes
Practice exercises
Learning resources
Skills
Endothermic
Exothermic
Activation Energy
Enthalpy
Calorimetry
TX Curriculum Aligned