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Explore the fascinating world of energetics in this in-depth lecture designed for 9th-grade Chemistry students (PTB 2025). This video covers: What is energetics? Understanding system and surroundings in thermodynamics. Enthalpy and enthalpy change explained with examples. Exothermic and endothermic reactions and their importance. How does a reaction take place? (Transition state theory). Difference between anaerobic and aerobic respiration with chemical insights. Perfect for Punjab Textbook Board students preparing for Chemistry exams. Get clear, concise explanations and real-world applications to boost your learning! 00:00 Intro of energy and its types 0000 define Energetics 9:39 System and surrounding 12:21 Enthalpy 20:06 Exothermic and endothermic reactions 27:21 Application of exothermic reactions in daily life 30:33 enthalpy change in water fromation 39:33 How does a reaction take place? 51:25 Aerobic and anaerobic respiration pdf notes https://sg.docworkspace.com/d/sID-Wjf... Don't forget to like, comment, and subscribe for more 9th-class Chemistry lectures. missed chapter 4 video ? • 9th Class Chemistry | Stoichiometry chapte... 9th chemister chapter 5 Equilibria • 9th class Chemistry Chapter 6 | Equilibria... New 9th chemistry ptb 2025 playlist • Chemistry 9th class - New book 2025 | The ... #Energetics #9thClassChemistry #PTB2025