Chemistry is the study of matter and the changes it can undergo. In this first unit of class 11 chemistry, we learn the significance of scientific notation, rules to calculate significant figures, the laws governing the combination of different atoms, mole concept, stoichiometry that involves the study of amount of substances that are involved in reactions, and modes of expressing the concentration of the solution.
Curated by: Khan Academy India - English (34 videos)
In this video, we explore the International System of Units (SI) and understand why standardization in measurement is crucial — illustrated through real-world examples, including the infamous Mars Climate Orbiter failure caused by a unit mismatch. We’ll dive into the seven fundamental scientific quantities, take a quick look at CGS units, and see how SI units are deeply embedded in our daily lives — from cooking and construction to healthcare and space missions. Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/class-11-chemistry-india/xfbb6cb8fc2bd00c8:in-in-some-basic/xfbb6cb8fc2bd00c8:in-in-properties-of-matter/e/units-and-measurements Timestamps: 0:00 Importance of units 0:45 Importance of consistent standard units 2:11 Introduction to SI units 6:27 Summary of Seven Fundamental SI units 7:23 Derived SI units 8:30 Introduction to CGS system 8:45 Real world applications of SI units Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Nitika Duggal