Скачать или смотреть Atoms and Molecules | Class 9 CBSE | One shot revision

Atoms and Molecules | Class 9 CBSE | One shot revision

Dive into the fundamental world of Atoms and Molecules with this comprehensive video based on the Class 9 CBSE syllabus! We cover all the essential topics, from the laws governing chemical combinations to calculating molecular mass.
What You'll Learn in This Video:
Laws of Chemical Combination: Understand the two cornerstone laws of chemistry:
Law of Conservation of Mass: Mass is conserved in a chemical reaction.
Law of Constant Proportions: Elements combine in a fixed ratio by mass.
Dalton's Atomic Theory: Learn the key postulates of John Dalton's revolutionary theory of matter.
The Atom and Atomic Mass: Definitions, symbols of elements, the concept of Atomic Mass Unit (amu or u), and how relative atomic mass is calculated.
The Molecule: Definition of a molecule, its characteristics, and the difference between Mono-, Di-, Tetra-, and Poly-atomic molecules (e.g., Ar, O₂, P₄, S₈).
Molecules of Compounds: Learn how atoms of different elements combine in fixed proportions.
What is an Ion? Differentiating between Cations (Positively charged) and Anions (Negatively charged).
Valency: The combining power (or capacity) of an element.
Writing Chemical Formulae (Rules & The Criss-Cross Method): A step-by-step guide on how to write correct chemical formulae for binary compounds using the criss-cross method (e.g., \text{NaNO}_3, \text{Ca(OH)}_2).
Molecular Mass & Formula Unit Mass: Learn to calculate the Molecular Mass (for molecules like \text{H}_2\text{O}) and Formula Unit Mass (for ionic compounds like \text{CaCl}_2) of a substance.
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