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Basic Units Of Matter Free Doubts and Solutions

CBSE - IX - Chemistry - Atoms and Molecules

velency of the element in halogen group is ................

Asked by ASHISHKARCHE123 13th December 2018, 11:40 AM
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CBSE - IX - Chemistry - Atoms and Molecules

How can we write chemical formulas  

Asked by bhardwajritik2602 13th December 2018, 7:31 AM
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CBSE - IX - Chemistry - Atoms and Molecules

How is valency calculated? Why some elements have two or more valencies?

Asked by Vishalgarg1234 30th November 2018, 7:35 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is the difference between molecular mass and gram molecular mass?  

Asked by mohansharma8032 22nd July 2018, 11:28 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What is molecule?

Asked by lakhinandanbora21590 21st July 2018, 7:45 AM
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CBSE - IX - Chemistry - Atoms and Molecules

do stable atoms contains any charge?

Asked by ipranjal01 8th April 2018, 2:48 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What are radicles ? explain with the help of an exaple 

Asked by deepikankur 27th February 2018, 9:21 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Do the protons repel inside the nucleus fo the atom?If yes then why dont they come out of the nucleus?If no then why becuase like charges should repel?

Asked by aahnik.mohanty 17th February 2018, 10:40 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Give reason why atom is electrical neutral but still it has a tendency to form ion    

Asked by Ankitkholi2002 5th February 2018, 4:41 AM
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CBSE - IX - Chemistry - Atoms and Molecules

 Can I get valency table for writing chemical formula 

Asked by Muruga 23rd January 2018, 6:52 AM
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CBSE - IX - Chemistry - Atoms and Molecules

what is the difference between molecule and compound?

Asked by angelstarshreya 13th January 2018, 8:49 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is mean by an isotopes

Asked by shashikathi56 29th November 2017, 6:27 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Q ACompound contains 38.8%C, 16%H and 45.2%N . The emprical formula of the compound is:

Asked by vikasg13.hardware 13th November 2017, 11:20 AM
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CBSE - IX - Chemistry - Atoms and Molecules

A sample of certain mass of gas was collected and it was found that the number of atoms and the number of molecules in the collected sample are equal. You are required to state the conclusion drawn from this observation. Give reasons for your answer.

Asked by gpnkumar0 11th March 2017, 12:29 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What is variable valency? Name three elements exhibiting variable valency.    

Asked by Topperlearning User 29th March 2016, 4:38 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What are Ions (or radicals)? Explain in details its types with the help of an example.    

Asked by Topperlearning User 29th March 2016, 4:31 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What does the charge indicate?

Asked by Topperlearning User 29th March 2016, 4:25 PM
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CBSE - IX - Chemistry - Atoms and Molecules

(a) How do atoms exist? Explain with examples. (b) Why are we not able to see individual iodine molecules with our eyes but are able to see an iodine crystal?

Asked by Topperlearning User 29th March 2016, 4:15 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Give atomicity of following element.Neon, Nitrogen, Phosphorus, Sulphur

Asked by Topperlearning User 29th March 2016, 4:12 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Classify the following molecules as tetra-atomic and penta-atomic molecules:H2O2, CHCl3

Asked by Topperlearning User 29th March 2016, 4:09 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What do we call the molecule consisting of eight atoms? Give one example of such a molecule.

Asked by Topperlearning User 29th March 2016, 4:09 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What constitutes a molecule, a molecule of an element and a molecule of compound?

Asked by Topperlearning User 29th March 2016, 4:06 PM
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CBSE - IX - Chemistry - Atoms and Molecules

how many atoms do a cell have.

Asked by sheebapetrishia 20th October 2015, 8:59 PM
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CBSE - IX - Chemistry - Atoms and Molecules

what is atomicity?

Asked by pahiroy1221 21st July 2015, 8:25 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Classify the following as 'molecule of element' or 'molecule of compound': NH3, Br2, CO2, O2

Asked by Topperlearning User 23rd December 2014, 1:25 PM
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CBSE - IX - Chemistry - Atoms and Molecules

What are isotopes?

Asked by Vatsal Sinha 13th December 2014, 8:51 AM
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CBSE - IX - Chemistry - Atoms and Molecules

WHY WE FEEL COOL AFTER TAKING A HOT BATH

Asked by nandlal 14th May 2014, 6:21 PM
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CBSE - IX - Chemistry - Atoms and Molecules

Write the atomicity of the following molecules. (i) H2SO4(ii) CCl4

Asked by Topperlearning User 9th May 2014, 10:46 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the atomicity of chlorine and ammonia?

Asked by Topperlearning User 9th May 2014, 10:44 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Name a non metal which is tetra atomic.

Asked by Topperlearning User 9th May 2014, 10:44 AM
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CBSE - IX - Chemistry - Atoms and Molecules

(i)Give an example each of a monoatomic and a polyatomic element. (ii)How many atoms are present in CaCl2 molecule and SO42- ion?

Asked by Topperlearning User 9th May 2014, 10:43 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Give an example of (i) triatomic (ii) Polyatomic molecule of elements.

Asked by Topperlearning User 9th May 2014, 10:41 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Define the following along with one example each: 1. Monatomic molecule2. Diatomic molecule3. Triatomic molecule

Asked by Topperlearning User 9th May 2014, 10:37 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Explain the term atomicity with the help of two examples.

Asked by Topperlearning User 9th May 2014, 10:36 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Is it possible to see atoms nowadays? If yes, then how?

Asked by Topperlearning User 9th May 2014, 10:33 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Why it is wrong to state "an atom of water"?

Asked by Topperlearning User 9th May 2014, 10:33 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Explain giving examples what is a molecule of a compound.

Asked by Topperlearning User 9th May 2014, 10:32 AM
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CBSE - IX - Chemistry - Atoms and Molecules

(a) Name the forces which hold the atoms together in a molecule. (b) What are the different ways in which molecules can be formed?

Asked by Topperlearning User 9th May 2014, 10:30 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Explain the atomicity shown by noble gases.

Asked by Topperlearning User 9th May 2014, 10:29 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What are molecules? Give two examples.

Asked by Topperlearning User 9th May 2014, 10:28 AM
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CBSE - IX - Chemistry - Atoms and Molecules

What is the relationship between nanometer and metre. What will be the value of atomic radius of carbon in metres. (Atomic radius = 0.077 nm)

Asked by Topperlearning User 9th May 2014, 10:27 AM
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CBSE - IX - Chemistry - Atoms and Molecules

(a) How is the size of an atom indicated? (b) Which atom is the smallest atom of all?

Asked by Topperlearning User 9th May 2014, 10:26 AM
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CBSE - IX - Chemistry - Atoms and Molecules

Define an atom. Why are atoms called the building blocks of matter?

Asked by Topperlearning User 9th May 2014, 10:25 AM
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CBSE - IX - Chemistry - Atoms and Molecules

If an atom has 1electron & 1proton,will it carry a charge or not? Why?

Asked by Nishal 2nd April 2008, 5:21 PM
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CBSE - IX - Chemistry - Atoms and Molecules

describe an atom

Asked by 11th March 2008, 11:33 AM
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