Class 9 Science | Chapter 3 | Rules For Writing Chemical Formula | Atoms And Molecules | NCERT

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In this session we will be starting with the chapter "Atoms and Molecules".
We will cover Rules For Writing Chemical Formula.
You can also follow me at :
learnwithmansi
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[@abhinav3596]

Best of luck for your tomorrow's science exam 📚🤞

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Thank you

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[@tiyara9535]

Thanks

[@aditiaashi7695]

Thx bro

[@thatadolescent_7]

Real life saver of students ❤️

[@savitasoni9322]

The way you teach us is ❤️

[@ridhimasharma8204]

But ma'am at 5:01 won't it be CaO as 2 and 2 will cut as they are same and we will be left with 1 which you said we can ignore?

[@a.t3152]

yes ur right, ca is +2 and oxide is -2 ,so it wil cut. - and + always cuts off , so it will be Ca O

[@PreetiGupta-el6by]

Kindly check your videos before uploading

[@madhvijoshi9389]

Thank u thank u thank u thank u so much ma'am tomorrow is my final paper of science . Just because of you I understand something in chemistry again thank u so so so much ma'am

[@smritisingh_6600]

Ma'am, Nitrate ka formula actually me NO3 kaise aaya?? Ye kaise hota hai?🤔

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[@bhaktidarekar6248]

Ma'am plz make video on gravitation as that lesson is too hard and my exams are also coming near

[@jagdishchoudhary6868]

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[@mayagariya6625]

Thank you mam .... But plz fastly upload maths ex 13.6... It's a request 🙏🙏🙏🥺

[@AdithyaM-cw5ul]

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[@brijgopalbishnoi3978]

Thank you Mansi madam you are you are good teacher

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Mam I am attending your all classes And I watch your all video with sequence

[@raviarora2564]

Hi Mansi di Your teaching way is sooooooooo good 👍😊 When I listen your video ,My doubts are cleared . And Mam I thankful to you 💓💓💓 bcz You also teach us science . When I don't know that you also teach science ,I get less marks 😜 butttttttt......now I get good marks . In the previous unit test I got 30 out of 30 ..🥳🥳🥳🥳🥳😊😊 it's all bcz of u Once again THANK YOU SOOOOOOOOOOO MUCH DI 😊😊😊😊 MAY GOD BLESS YOU AND STAY WITH U 😘💕😘💕

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Ur full name vanshika?

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[@Kunal_editx454]

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[@Lost_in_SpAce07]

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[@Someoneitold]

*the way ur eyes looked at that*@@blinkpop16

[@ShreyaThakur-d1n]

Such a nice teacher ❤ thank u ma'am

[@Rajput_Aditi]

Mam I have a question that mam how we know that were we use to combine which atom to make a compound for example if we combine hydrogen with zinc that we can do it or not?

[@nabhyas7822]

you can online combine cations with anions... and anions with cations.. you cant combine cations with cations or anions with anions... In your case (H+, Zn2+) both are cations so you cannot combine them.

[@afatma3492]

Mam how can i learn the valencies?.

[@dhriti18]

shouldi tellelel

[@laserfusser]

No need to learn , just learn atomic number from that you can calculate valency

[@rajshreejadhav9959]

Mam thank you so much for your explanation now my all doubts are clear thank you so much ❤️

[@MahiChouhan-n6n]

Thanks mansi mam 😊

[@aashishbayes7350]

Mam please explain Hydrogen phosphate chemical formula

[@rishitarajak4964]

Mam thankyou soooooooooo much 😘😘😘 aap na meri problem solv kar di

[@calm_error]

Best of luck all friends for science exam // date 7/3/2023.....❤️❤️❤️

[@timetoshineihita2609]

Mam i don't understand why copper have two valence and it's also given in our book table

[@gurinderdhillon47]

Thank you Mam your explanation clears all doubt, s

[@baristarprasad4384]

You explain very easily.i like your study method

[@Nuzhatnazirmir]

Not study method it's teaching method

[@neeruattar6436]

Ma’am your explanation is superb!!

[@Jeshu__boii]

Ur teaching is so love 💕💕💕💕😘

[@Jaass_deep]

thanku very much mam ajj mane bhaut veadio dekhe par samej ne aaya apke veadio ko ek bar dekha par samej aagya thanku mam😍😍

[@sukritasharma3653]

Thanks a lot mam... mam please upload a video on how to calculate valency... please mam

[@dhriti18]

ch 4 bey

[@diyaverma9604]

Mam in 6th chemical formula its answer should be CaO because valency will cut by common factorisation. Please reply.

[@yugank8335]

Hi

[@subhashmittal3108]

Yes u are right

[@SantoshKumar-xn4zq]

Mam at 4:54 you wrote the formulae of calcium oxide as Ca2O2 but it's wrong it will be CaO only bcoz there is acharge of +2 and -2

[@BigmaMale]

Ya

[@marhabanaaz70]

Mam uh teach so beautiful ♥️

[@chooseyourfavourite4466]

Very well explained mam

[@infosciencecom4370]

4:49 it should be CaO.

[@zainabqureshi7666]

Ma'am, correct me if I am wrong but when both the ions have same valencies then they are cancelled like, Calcium oxide Ca O 2 2 CaO

[@progamer-1313]

Yes that's right

[@Anaum_sana]

I had this doubt too thenks for clearing it out✨

[@progamer-1313]

@@Anaum_sana welcome

[@Armyblink9669]

Thanku so much mam this video helped me alot💗

[@varinderkaur3506]

Bts-a.r.a.m.y

[@rajpreetsingh6550]

Mam but app ese shells ki according samja oo like KLMN Ab hame yad thodi hoga ki 2 kaha se aya 1 kiska hoga Shells klmn se pata lag sakta hai ki kiska kya hai

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Mam thank you this vedio is very helpful

[@soinamshongmu8289]

Thank you mansi mam for explaning in easy wah🙏

[@Rajat_Bansal_]

Thanku mam for this video I understand this chapter perfectly as compare to tution teacher one again thanku mam 👍👍👍🙂

[@rajeshlimani7018]

Mam but how do we know that hume valency kab leni he or charge kab lena he

[@sshantssar8195]

Please 🙏 make video on Gravitationa It is very- Hard chapter

[@nathuram5053]

Mam can you explain me that how to find the valency of hydroxide

[@mayankgunda6720]

Can u tell me how is NO3 charge 1

[@divyabhardwaj8055]

Hello mansi dii , you are really great ❤️😅

[@anamikas4143]

I was waiting for this for the whole day

[@DharmendraKumar-vy3vd]

Good 👍

[@adhvii2605]

Hi mam please say how to find valencies and atomic mass

[@mrxmicro3487]

by ec configuration

[@belugassecondbrother7029]

Thank u so much ma'am. Also can u make a video on physics gravitation numerical and how to do problems. That chap is hard that's why . Pls mam

[@gurmankaur6241]

Thank u so much ma'am 💖💖 tomorrow is my science exam nd i got very help from ur channel 😊😊thanx for helping us in studies 😊😊😊😊😊 😊😊😊😊😊😊😊

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Hi mansi mam you are very very very very good teacher of my life I had pass my exam because of your video

[@Nirmalapoonia-31]

Just great explanation

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Mam aapke jaisa koi teacher nhii

[@asmitha_kunde4565]

Thank you mam

[@gathikakruthib9220]

Mam can you send post a video of Structure of an Atom Explanation. PLZ

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Mam aap all rounder teacher ho

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I understand better from.mansi mam others are telling but I am not understanding thanks Mansi mam🙏🙏

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jinke apne sheeshe kaanch k hote hai..vo dusre par pathr nhi fenkte 🤌🏻😂

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thank you mam this video helped me alot tommorow is my exam

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Me abhi aapka he video dekh rahi thi class 8 ka algebraic expressions love you mam you are great

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Really❤❤ you explain too good😮🎉🎉 Mam and main yah video kafi tension ho rahi hun😢😢 aur abhi mujhe meri aur thank u so ❤❤Mach this video making😅😅❤❤❤❤❤❤❤😂😂😂😂😂 ab me khush hun😂🥰🥰🥰🥰🥰 hasi nahi ruk Rahi meri 😂😅😅😅😅😅😅😅😅😅😅😅😅

[@sajjansancheti9208]

Nice teaching But when valencies ate same they cancel out each other So formula of calcium oxide is CaO bcz valency of calcium and oxide is 2 so they cancel out

[@Osaker_216]

Yes

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Blink⚫💖

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BLINK⚫💖

[@_Rashmi_Rajput_]

Mam making rules was easy but we are not able to learn symbols and valencies pls tell any trick for that

[@Gurpreetsingh-ig4mx]

Issi ka kal test he..bar bar bcha... Thankyou mam 😄😁

[@rs476sharma]

6 me ca2o2 nahi hoga CAO hoga

[@hameedmir9786]

Thanking mam

[@jayaprakashallada447]

Please make made video of structure of atom

[@liza418]

Mam as now you've started with uploading science too you upload very less maths question please don't lag in the maths part do it as fast 🤕 please

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Thank you so much ma’am

[@bantoobhatia1481]

What is the chemical formula of Aluminium sulphate

[@marhabanaaz70]

Mam plz start physics as soon as possible bcz physics is too hard in science

[@venomocraft1477]

hello mam I have a doubt mam you say nitrate is no3 why I mean why should the nitrate compound formula is no3 opposite another please tell me mam

[@farhanidrisi2210]

Agar d ke ca oh 2 mai bracket lagega to usse pehle a or b example mai bracket kyu nahi lagaya?

[@Horizonater]

Ma'am what about the charges on the acids and bases

[@Priyanka-hc4ou]

Maam please make a video of chapter 4of chemistry structure of atom

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Best of luck mam 😊👍

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she makes my life easier💕

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Thank-you mam🖤

[@adithyamachiraju780]

Mam can u pls post the chapter "the structure of an atom." Actually mam these 2 chapters r coming for final exam.. so plss mam consider my request and post this chapter before March 5.. please mam

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Please upload the next video soon . Tommoro is my exam

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Cross multiplication

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Good afternoon mam

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Thank you ma'am

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Mam you teach very nice i have see all your videos of maths and science

[@Moxyyy5108]

mam but the sulphide's valency is -2

[@ReetaSingh29323]

-ve matter nhi karta

[@dhriti18]

@@ReetaSingh29323 ohohohohohohhohohoohhohohohohohohohhohoohhohohohoho

[@MuskanShorts]

Thanku mam ❤ache se samjh aaya

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This is a explain is very easily

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Vote for saying mam to start again teaching on white blackboard 😢😢😢😢

[@VinitaGupta-x3v]

Yes I also want mam to teach on whiteboard 😔😢😢

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I want mam to teach on whiteboard 😢😢😢😢

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Di Kay app online class kar sakati hai

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Plz di

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Tomorrow is my exam so that I'm watching this video 😁😁🤣🤣 but understand this very easily thankyou ma'am

[@meghasingh7993]

Same 😂

[@shivanikher6705]

Mai bhi aise hi gyi thi 9th ka final exam dene sab bhul gyi exam me baithkar ab 10 class ke exams ke liye phle 9th ki chemistry samjh Rahi hu 😑🔪

[@crystalshekhar2726]

4:57 mam why cant we just cut the 2 and it will be CaO.

[@Tarun770_]

But how to know the valency of compounds

[@pavanbisen328]

Thanku mam

[@muskandhirwani8213]

Mam how the valency of ( oH) is 1 valancy of o is 2 and h is 1

[@Me......who....19]

There O and h are not different ions they are combined and forms hydroxide ( it also mean that the element of OH is hydroxide )so the valency of hydrogen is 1 and therefore mam is saying that...

[@dhriti18]

but here OH is a single element its not differen OH is hydroxide

[@AlwaysRuchi]

Nice explanation 🫰🏻👍👍👌 ma'am 😄