Laws of Chemical Combinations Class 11 CBSE Notes with MCQs and Answers Laws of Chemical Combinations – Complete CBSE Class 11 Chemistry Notes with MCQs, Case Studies, and Exam Questions. - Dr.Sanjaykumar Pawar Laws of Chemical Combinations (NEET Notes) 📖 Introduction The Laws of Chemical Combinations explain how elements combine to form compounds . These laws are the foundation of chemistry and are very important for the NEET examination . 1. Law of Conservation of Mass Statement During any physical change or chemical reaction , the total mass remains constant . Matter can neither be created nor destroyed. Formula Mass of Reactants = Mass of Products Example Hydrogen + Oxygen → Water 2 g Hydrogen + 16 g Oxygen = 18 g Water Total mass before reaction = 18 g Total mass after reaction = 18 g Hence, mass is conserved. Key Points Proposed by Antoine Lavoisier (1789) . Applicable to both physical and chemical changes. Atoms only rearrange; they ar...
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