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)
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:atomic-structure-and-properties/x2eef969c74e0d802:elemental-composition-of-pure-substances/v/empirical-molecular-and-structural-formulas Want to explore more? Check out the full Stoichiometry and the mole playlist here: https://youtube.com/playlist?list=PLSQl0a2vh4HDlQzYt6FMr4i4Yf_nyjRN6&si=1hPtTbDzzDQ5JUAw There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas show the simplest whole-number ratio of atoms in a compound, molecular formulas show the number of each type of atom in a molecule, and structural formulas show how the atoms in a molecule are bonded to each other. Sections: 00:00 - Ways to represent molecules 00:10 - Naming molecules: example benzene 00:34 - Empirical formula explained 02:00 - Molecular formula of benzene 03:12 - Structural formula and bonding 04:55 - Organic shorthand notation 05:23 - Comparing empirical vs molecular formulas 05:50 - Example of water's formula types 06:25 - Water's structural formula 06:42 - Summary of molecular representations ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc