Chemistry is the study of matter and the changes it undergoes from "summary" of Chemistry Simplified NCERT Class 11 by Sanjay Sharma
Chemistry is a fascinating subject that revolves around the study of matter and the transformations it goes through. Matter is anything that occupies space and has mass. It can exist in various forms such as solid, liquid, or gas. Chemistry helps us understand the composition, structure, properties, and behavior of matter. The changes that matter undergoes can be physical or chemical in nature. Physical changes involve alterations in the state or appearance of matter without changing its chemical composition. For example, melting ice to form water is a physical change since the chemical composition of water remains the same as that of ice. On the other hand, chemical changes result in the formation of new substances with different properties. These changes involve the breaking and forming of chemical bonds. For instance, when iron rusts, it undergoes a chemical change as it reacts with oxygen in the presence of moisture to form iron oxide. Chemistry also explores the interactions between different substances and how they react with each other. These reactions can be classified into various types such as combination, decomposition, displacement, and double displacement reactions. Understanding these reactions helps us predict the products formed and analyze the changes that occur. Moreover, chemistry delves into the concept of energy changes during chemical reactions. Some reactions release energy in the form of heat or light, known as exothermic reactions, while others absorb energy, known as endothermic reactions. The study of energy changes provides valuable insights into the driving forces behind chemical transformations.- Chemistry provides a deeper insight into the world around us by studying the fundamental aspects of matter and the changes it undergoes. By exploring the composition, properties, and behavior of substances, we can unravel the mysteries of nature and harness the power of chemical reactions for various applications.
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