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Every time a chemical reaction happens, energy is either released (making things hotter) or absorbed (making Bond Energies and Calorimetry Insights Summary: This presentation explores exothermic and endothermic reactions by detailing how energy is absorbed to Bond Energies and Calorimetry Insights Summary: This presentation explores exothermic and endothermic reactions by detailing how energy is absorbed to IGCSE Chemistry updated notes, membership features, exam tips, and preview links for 2023 to 2028 exams. Questions on 500+ smallest of Topics. Boost your retention with interactive Document Description: Chemical Energetics Chapter Notes - Chemistry for GCSE/IGCSE - Class 10 for 2026 is part of preparation. IGCSE Chemical Energetics Overview This document defines and provides examples of exothermic and endothermic reactions. Learn how to structure answers clearly and maximise marks across all question types. 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