This worksheet helps students understand the key differences between endothermic and exothermic reactions through real-world examples and visual aids. With 7 questions, learners are asked to identify whether a reaction absorbs or releases energy, recognize temperature changes, and explain the reactions using the concept of bond breaking and formation.

When two chemicals mix their temperature rises: exothermic

A solid burns brightly and releases heat, light and sound: exothermic

When two chemicals are mixed their temperature drops: endothermic

Two chemicals will only react if you heat them continually: endothermic

Plants take in light energy for photosynthesis: endothermic

When green copper carbonate decomposes, the equation is (the picture)
Is the reaction exothermic or endothermic? Use ideas about bonds to explain why.
endothermic: you break 5 bonds. while you only make 3 bonds


Is the reaction exothermic or endothermic? Use ideas about bonds to explain why.
exothermic: you break 3 bonds while you make 4 bonds


Explore exothermic and endothermic reactions using diagrams and bond energy concepts. Perfect for middle and high school chemistry and science classrooms.

Endothermic and Exothermic Reactions Science

Endothermic vs Exothermic Reactions with Bond Energy Focus

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Endothermic vs Exothermic Reactions with Bond Energy Focus

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