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)
What exactly is atomic mass, and how is it different from molecular or formula mass? In this video, we unravel the concept of mass in chemistry, starting with why carbon-12 is chosen as the standard, what amu (atomic mass unit) really means, and how percentage abundance plays a crucial role in calculating average atomic mass. We also break down molecular mass and formula mass with clear explanations and relatable examples. 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?lang=en Timestamps: 0:00 Introduction to masses 0:49 C-12 as the standard to measure masses 1:39 Why C-12 as a standard to measure masses 3:26 What is amu? 5:33 Understanding Percentage Abundance 7:47 Average atomic mass 9:41 Molecular mass 11:33 Formula mass 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