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Chapter 14 : Substances in Common use

🧪 Substances in Common Use: Class 9 Science Chapter 14 Welcome back to our Science series! After exploring the chemistry of carbon, we now move on to Chapter 14 to examine the various chemicals and substances that play a vital role in our daily lives. From the salt in your kitchen to the medicines in your cabinet, this chapter breaks down the science behind the materials we often take for granted. The journey begins with an in-depth look at important salts. We study the properties and uses of Common Salt (Sodium Chloride), Baking Soda (Sodium Bicarbonate), Bleaching Powder (Calcium Oxychloride), and Washing Soda (Sodium Carbonate). You will learn how these substances are produced and why they are essential for everything from food preservation to maintaining hygiene in our homes. We also explore the concept of "Water of Crystallization" and how it gives certain salts like Alum and Blue Vitriol their unique crystalline structures. The lesson then shifts to the world of Radioactivity. We introduce the concepts of Alpha, Beta, and Gamma rays and discuss the properties of radioactive isotopes. While radioactivity might sound like something out of a sci-fi movie, you will discover its critical applications in the fields of medicine, agriculture, and industry—such as in the treatment of cancer or the preservation of food. We also take a responsible look at the potential hazards of radiation and the safety precautions necessary when handling these powerful substances. Finally, we discuss the chemical substances used in modern technology and healthcare. We cover the composition and impact of various materials like Ceramics, Glass, and various types of soaps and detergents. The video concludes with a look at food colors, essences, and the chemical nature of deodorants and perfumes. By understanding the chemistry of these common substances, you will be better equipped to make informed choices about the products you use every day.