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
1:53:41 Subscribe BYJU’s Channels

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[BYJUSClass]

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[girloflight]

Kindly teach in english ma'am. There are many people who don't understand hindi like me. If the classess are in english we can understand better. Even our textbooks are in english. Please 🙏🥺

[Daredevil]

Homework Answer :- Atomicity of Na²CO³ = Sodium 2, Carbon 1, Oxygen 3 = 2+1+3 = (6 Ans)
Edit:- The session was very nice 🙂

[ananyahoney]

Mam very useful session but if you explain in english students who don't understand hindi like me they will also understand concepts very easy in your way of teaching so please mam next session onwards please try to conduct session on English

[avadheshkumar]

DOUBT- If acc. to Dalton theory ratio of masses will b in whole no. Then why we have chlorine's mass to be 35.5? That's not a whole No.

[ShowkatBhat-ohvu]

U r so amazing mam luv ur explanation and ur free-off cost platform💜

[rosieposie-mrjn]

Thank you byju's team for creating these amazing sessions for us students...THANKS A LOT!!!!

[PriyanssiSahoo]

27:32 Bruhh just think kya haalat hui hogi school ki😂😂

[pratisekdash]

Hello mam your explanation is very nice 💕😊 l like your style of explanation and can share your videos to my friends

[sajani]

Homework answer:
6
Amazing session mam 😍😍❤

[Nishil-]

43:43 it would only be as big as a grape with a 1.2cm of diameter

[rohithkalaimani]

Madam i Understand very easy ..It is very useful to me and others also.. All Teachers are friendly 🙂🤝..

[Nishil-]

42:10 there are 3.54 × 10 raised to 23 atoms or in other words, there are about 354 billion trillions of atoms in a single sheet of paper. which is a way more bigger number than 1 million. the unniverse is infinetly small and infinetly big.
43:43 it would only be as big as a grape with a 1.2cm of diameter

[AtomicStudent]

Thanks maam it was great thanks my all doubts are c, c 🎉🎉🎉

[hemlatasingh]

Thank you so much mam 😀really all my doubt are crystal clear 😁😁in that one short session 😁

[jaishreeshyam]

You teach really good 🙂 I always prefer my friends to watch the video thank you

[prachi-determinationandhope]

Atomicity of Sodium Carbonate is 6.

Thanks for the amazing session. It cleared all my doubts. 💜😊

[creativediaries.]

Thank you ma'am for this lovely session ❤❤🙏🙏

[maoozis]

I am Ahmad ilyas from Pakistan thank you make you make education easy ❤

[prachibhardwaj]

Home work answer:
Atomicity of Na2CO3 is 6, that is it is polyatomic