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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Define : Atomic Weight : - Chemistry

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प्रश्न

Define: Atomic weight :

व्याख्या
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उत्तर

Atomic weight : It is the ratio that tells how many times an atom of an element is heavier than atom of Hydrogen

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पाठ 4: Atoms, Molecules and Radicals - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 4 Atoms, Molecules and Radicals
Additional questions | Q 21.4

संबंधित प्रश्‍न

Write down the name of a compound represented by the following formula:

K2SO4


Write down the name of a compound represented by the following formula:

CaCl2


Give the name of the element present in the following compound: 

Hydrogen bromide


Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.


State the term.

The number of atoms present in a molecule of an element _________


 Define: Atomic number


What is meant by atomicity ? Explain with two examples.


What do the following denote ?

  1. N
  2. 2N
  3. N2
  4. 2N2

What is the difference between the molecule of an element and the molecule of a compound ? Give one
example of each.


Work out the formula for magnesium hydrogencarbonate.


What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.


Correct the following statement:

A molecule of sulphur is monoatomic.


Why are the symbols and formulae of substances important?


Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.


Give one example of a triatomic molecule


Give a reason why –

Ozone is considered triatomic, but phosphorus a tetratomic molecule.


State the atomicity of the following:

Neon


State the atomicity of the following:

Sulphur


Which of the following is a short and scientific way of representing one molecule of an element or compound?


State true of false. If false, give the correct statement.

NaCl represents one molecule of sodium chloride.


Classify the following molecules as the molecules of element or compound

1.  
2.  
3.  
4.  

Which of the following is a triatomic molecule?


The Atomicity of phosphorous is ______


Define: Atomicity.


Write any two classifications of a molecule.


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