Atoms and Molecules Class 9

Atoms and Molecules Class 9 : LIVE Class at 8 PM Today!

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At Manocha Academy, learning Science and Math is Easy! The school coursework is explained with simple examples that you experience every day! Yes, Science & Math is all around you! Let's learn every day from everyday life!

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🎯 Key Takeaways for quick navigation:

00:00 🧪 *Matter, including rivers, trees, air, and more, is made up of particles known as atoms and molecules. These particles have mass and occupy space, forming everything we perceive.*
03:40 🔬 *Atoms are incredibly small and cannot be seen with the naked eye or even regular microscopes. They constitute molecules, which can be seen as collections of atoms forming tiny particles.*
06:44 ⚛️ *Atoms consist of protons and neutrons in the nucleus, surrounded by electrons. Protons are positively charged, neutrons have no charge, and electrons are negatively charged.*
10:46 🌐 *Matter continually breaks down into smaller particles. From the macroscopic level of rivers to microscopic atoms, each stage reveals smaller constituents forming the world around us.*
14:55 🧲 *Molecules are composed of atoms. Elements such as hydrogen, helium, oxygen, sodium, and chlorine have distinct molecules based on the number of atoms they contain.*
21:51 🔢 *Atomicity refers to the number of atoms present in a molecule of an element. Elements can have varying atomicity, ranging from monoatomic (one atom) to higher values like diatomic, triatomic, tetraatomic, or octaatomic.*
26:09 🧪 *Valency defines the combining capacity of an element with other elements in chemistry, forming compounds when elements combine.*
27:17 🤝 *Hydrogen and chlorine combine to form hydrogen chloride or hydrochloric acid, showing the basic concept of valency.*
27:50 🧮 *Valency of elements like chlorine or oxygen is derived from their combining capacity with simpler elements like hydrogen.*
29:16 🔍 *Oxygen's valency of 2 indicates it can combine with two hydrogen atoms, while chlorine's valency is 1, combining with just one hydrogen atom.*
30:34 🌡️ *Nitrogen demonstrates a valency of 3, combining with three hydrogen atoms, forming ammonia (NH3).*
32:57 💍 *Elements form molecules of elements when the atoms of the same element combine, whereas different elements combine to create molecules of compounds.*
34:08 🌐 *Molecules are composed of atoms from different elements, as seen in examples like H2O (water) and HCl (hydrochloric acid).*
37:22 ⚛️ *Non-metals combining form covalent bonds by sharing electrons, while metals and non-metals create ionic bonds by electron transfer.*
38:48 🧲 *Cations (positively charged ions) and anions (negatively charged ions) form due to the gain or loss of electrons during bonding.*
42:35 📝 *Formulas of compounds are derived through the crisscross method, exchanging valencies between elements to create balanced compounds.*
48:30 📚 *Memorization isn't enough; understanding valency and practicing compound formulas is crucial for success in chemistry exams.*
51:48 🧮 *Valency is crucial in determining chemical formulas; understanding the valency of elements like copper and oxygen helps in creating formulas like Cu2O for cuprous oxide.*
53:39 🧪 *Understanding copper oxide: "Copper oxide" usually means cupric oxide (CuO) due to copper's common valency of 2, not 1.*
55:47 📊 *For calcium carbonate (CaCO3), knowing the valencies of calcium (2) and carbonate (2-) enables crisscrossing to determine the formula (CaCO3).*
57:48 📝 *Explaining calcium bicarbonate (Ca(HCO3)2) using valency exchange, recognizing bicarbonate as hydrogen carbonate (HCO3-).*
58:59 🧬 *Naming conventions for sulfur dioxide (SO2) and sulfur trioxide (SO3) are tied to the numbers in their names, simplifying formula determination.*
01:00:17 🤔 *Deriving sulfur's valency: Sulfur's valency in SO2 and SO3 (2 and 6, respectively) can be found by testing different values using oxygen's valency (2).*
01:02:05 🏛️ *Roman numerals in compounds like lead oxide indicate the valency of the metal; understanding this helps determine the correct formula (PbO and PbO2).*
01:04:24 📚 *A summary: Particles discussed include atoms, molecules (can exist independently and are made up of atoms), and ions (charged particles).*
01:08:42 🌐 *Molecules can exist independently, while atoms may or may not exist independently; this distinction defines their existence.*
01:10:38 🔍 *Atoms are neutral, whereas ions are charged particles formed by gaining or transferring electrons.*

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Newton's 4th law says that every book continues to be in rest until and unless interal or external exam appears and speed of page turning is directly proportional to the syllabus to be covered and tension in the mind remains constant

[nikhatparveen]

I have never seen a teacher like you, the way you make us understand the topic, is very simple and easy to understand even for a weak student, like me..

[dibyanshukushwaha]

Sir, plzz arrange a separate class for determining the formula

[navyasharma]

Sir you’re the best teacher
Your teaching is very easy
I understood everything
Thank you very much 😊
And keep making such videos
These help a lot

[sudhirkumardudala]

Super explaining sir about valency and atomicity

[ayushmondal]

Sir when is the next live class because your classes are great

[viviananih]

Sir this is my first class even though I am a 10th grader, but your explanation is more understandable than any other teacher I have met

[sinchana]

Your teaching is crystal like clear... thank you very much sir 🙏

[rachanaa]

hi sir thank you so much cause this really helped me out cause whenever I click on a video the language would be different so when I clicked on your video your language was English and not only that it made me understand chemistry very clear so thank you soo love from Chicago,

[naggraajja]

Sir, Can You Please Arrange Chemistry (Atoms family)Videos as Ordered Sequence Wise In Playlist.

[alhudatq]

sir what about law of conservation of mass and law of definite proportion, daltons atomic theory, postulates of daltons atomic theory??

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[ashokkumarym]

Sir your explanation is so clear thank. You for your live class☺️

[itsnotme]

I like this teacher because he smiles every time🤗🤗

[basirubarrow]

thank you for ur explanation i really understand it now

[educatsio]

Great video...Can we get the valency of an element by their atomic number?

[comfortetan]

Sir please make a video on nuclear chemistry, I really love your teachings
💝

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