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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Define : Atomic Weight : - Chemistry

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प्रश्न

Define: Atomic weight :

परिभाषा
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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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अध्याय 4: Atoms, Molecules and Radicals - Additional questions

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

संबंधित प्रश्न

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

Al2(SO4)3


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

KNO3


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

Quick lime


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

Hydrogen bromide


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

Baking powder


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

Potassium sulphate


What is the atomicity of the following ?

  1. Oxygen
  2. Ozone
  3. Neon
  4. Sulphur
  5. Phosphorus
  6. Sodium

Write the formulae of the following compounds. Also name the elements present in them.

  1. Water
  2. Ammonia
  3. Methane
  4. Sulphur dioxide
  5. Ethanol

In what form does oxygen gas occur in nature ?


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


Molecular compounds are usually formed by the combination between :


An element X forms the following compounds with hydrogen, carbon and oxygen :

H2X, CX2, XO2, XO3

State the three valencies of element X which are illustrated by these compounds.


Give one example of a triatomic molecule


Give one example of a polyatomic molecule.


Give a reason why –

Helium is considered monoatomic, but hydrogen a diatomic molecule.


State the atomicity of the following:

Argon


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.  

If a molecule is made of similar kinds of atoms, then it is called ______ atomic molecule.


Two elements sometimes can form more than one compound.


Define: Atomicity.


Derive the relationship between Relative molecular mass and Vapour density.


Which of the following contains maximum number of molecules?


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