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Class 9 CBSE Science NCERT Chapter 3 Atoms And Molecules
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Class 9 CBSE Science NCERT Chapter 3 Atoms And Molecules
Timestamps:
0:00 Introduction
1:08 Why study Atom & Molecules?
1:44 The story of Atom
4:21 What is Atom?
7:14 How big is an Atom?
10:16 Representation of atoms of different elements
16:23 Dalton’s Atomic Theory (1808)
19:55 Laws of Chemical Combination
21:23 Law of conservation of mass
24:24 Laws of Chemical Combination : Law of constant proportion
26:41 Question 1.
28:54 Question 2.
30:29 Atomic Mass
38:13 Do atoms exist independently?
41:17 Molecules
43:41 Molecules of Elements
46:49 Molecules of Compounds
53:59 Ions
59:31 Valency
1:02:50 Chemical Formula
1:04:00 Chemical Formula:Format
1:06:47 Writing Chemical Formula : Rules
1:10:27 Writing Chemical Formula
1:13:54 Question Time
1:16:40 Molecular Mass
1:18:46 Formula Unit Mass
1:20:44 Question Time
1:22:38 Question Time
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