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Chemical reaction diagram depicting the decomposition of copper carbonate into copper oxide and carbon dioxide.

Diagram showing the decomposition of copper carbonate (CuCO₃) into copper oxide (CuO) and carbon dioxide (CO₂), illustrating a chemical reaction where bonds break and new bonds form.

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Show Answer Key & Explanations Step-by-step solution for: Endothermic and Exothermic Reaction Worksheet | Download Free PDF ...

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1. a) Exothermic
b) Exothermic
c) Endothermic
d) Endothermic
e) Endothermic

2. a) The reaction is endothermic. Breaking the bonds in copper carbonate requires energy absorption, and since the reaction needs continuous heating to proceed, it indicates that more energy is absorbed than released.

f) Bonds broken (blue): H-H bonds in 2H₂ and O=O bond in O₂.
Bonds formed (red): O-H bonds in 2H₂O.

Parent Tip: Review the logic above to help your child master the concept of exothermic and endothermic reactions worksheet middle school.

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