Atoms and Molecules Class 9 Science (Chemistry) One Shot (Concepts+)Questions | CBSE Class 9 Exams

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In this episode of the new series called Jeet Ka Josh, we will be covering all the important concepts in your Class 9 Chapter 3, Atoms and Molecules.

In this online session, your favourite BYJU’S educator, Kriti Ma’am, will be covering the following topics in detail using examples:
Laws of chemical combination
Law of conservation of mass
Law of constant proportions
Dalton’s atomic theory
Atomic mass and atomic mass unit
Molecules of compounds
Mole concept, molar mass, atomic valency
Mole concept & Avogadro number

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00:00 Atoms and Molecules Class 9 Science (Chemistry) One Shot
4:16 ANTHE - Aakash National Talent Hunt Exam
7:23 What do they all have in common?
8:21 All about Matter
9:11 About Atoms
10:19 What is Democritus?
12:03 Aristotle Said about Matter
13:20 Antoine Laurent Lavoisier
16:09 Joseph Louis Proust
16:40 Laws of Chemical Combination
18:05 Law of conservation of Mass
23:10 Law of constant proportions
27:20 Dalton’s Atomic Theory
28:25 Postulates of Dalton’s Atomic Theory
34:57 Q. How much amount of NH3 is produced when 28 g of nitrogen completely react with 6 g of hydrogen?
40:24 What is an Atom?
41:50 Everything Around Us Is Made up of Atoms
43:13 Did You Know? - Fact
45:03 Q.If everything is made up of atoms, then why do they look different from each other?
45:52 Different Substances are Made Up Of Different Atoms
46:56 About Elements
47:59 Atomic Symbols
52:07 Berzilius System
59:28 Do Atoms Exist Independently?
1:01:42 Molecules - Atoms
1:05:11 Atomicity
1:07:00 Q.Determine the atomicity of ammonia.
1:09:03 What is Ions?
1:12:02 Term of Valency
1:12:54 Valency of Mono-atomic Cations
1:15:58 Valency of Poly-atomic Ions
1:18:26 Ions of Different Valency
1:18:47 Break Time
1:24:23 Writing Chemical Formulae
1:24:58 Rules for Writing a Chemical Formulae
1:30:23 Formulae of Simple Compounds
1:34:22 Important Case - Zinc Oxide
1:36:15 Q. Which of the following represents a correct chemical formula?
1:40:40 Matter has mass, and so do atoms!
1:43:33 Relative Atomic Mass
1:46:44 Molecular Mass
1:47:21 Let’s Calcualte the Mass of Molecules
1:48:09 The Molecular Mass of HNO3 is
1:49:47 Formulae Unit Mass
1:53:19 About Telegram
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