Substances in Common Use — Chapter Summary
Maharashtra Board · Class 9 · Science
Summary of Substances in Common Use for Maharashtra Board Class 9 Science. Key concepts: Everyday substances can be, Common salt or table salt and A white.
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Overview
In our daily lives, we use countless substances like table salt, soap, baking soda, and many others. This chapter explores the scientific nature of these common substances, focusing on important salts, radioactive materials, and various chemical substances we encounter every day. Understanding the p
Key Concepts
Everyday substances can be scientifically classified
Everyday substances can be scientifically classified into acids, bases, salts, metals, and non-metals based on their chemical properties. For example,
Common salt or table salt
Common salt or table salt is a neutral salt formed by neutralization of sodium hydroxide and hydrochloric acid. It has pH 7, is crystalline, and is us
A white
A white, non-crystalline powder that is basic in nature. It releases CO₂ when heated, making it useful for baking and as an antacid for reducing stoma
Crystalline sodium carbonate that converts hard
Crystalline sodium carbonate that converts hard water to soft water by precipitating calcium and magnesium ions as carbonates. It's hygroscopic and ba
A yellowish
A yellowish-white solid with strong chlorine odor, used for disinfection and bleaching. It slowly decomposes to release chlorine gas when exposed to C
Learning Objectives
- Identify and classify common substances used in daily life from a scientific perspective
- Understand the properties, preparation, and uses of important salts like NaCl, NaHCO₃, and Na₂CO₃
- Learn about radioactive substances, their types of radiation, and their applications in various fields
- Recognize the harmful effects of certain chemical substances and learn about safe alternatives
- Understand industrial processes like Teflon coating, anodizing, and ceramic manufacturing
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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