In this episode of concept capsule, we will discuss CBSE class 09 science chapter 3- Atoms and Molecules. We help you in understanding the concepts related to Compounds and how to write Chemical Formulae. We are going to help you gain a clear understanding of compound which is the bonding of two or more different atoms bonded together and also we will discuss how atoms combine to form molecules and compounds and how to write chemical formulae
By the end of this session, you will also be able to know about compounds and writing Chemical formula. Needless to mention, the session will help you to successfully attempt the different types of questions and help you prepare for your CBSE Class 9 term 2 exams
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00:00 Compounds and Chemical Formulae Class 9
2:59 Elements and their symbols
7:14 Atoms of most elements do not exist independently
8:53 Molecules of Elements
11:41 Molecules of Compounds
13:36 What are Ions?
18:44 Understanding Valency
19:15 Valency of mono-atomic cations
21:12 Valency of mono-atomic anions
22:16 Valency of poly-atomic ions
24:15 Monovalent, divalent and polyvalent ions
26:36 Writing Chemical Formulae
27:04 Rules for writing a chemical formula
29:44 Formula of a simple compound
32:37 Formula of a complex compound
34:25 Q.Which of the following represents a correct chemical formula?
39:38 Matter has mass, and so do atoms
42:37 Atomic Mass
44:36 Relative mass around us
46:10 Relative atomic mass
47:38 Atomic mass of some elements
50:40 Molecular Mass
51:11 Let’s calculate the mass of molecules
52:20 Q. The Molecules mass of HNO3 is
55:19 Formula Unit Mass
56:58 Summary
1:01:06 Update on Upcoming Session
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