Class 9, CBSE (NCERT) Science (Chemistry) | Atoms and Molecules - Sample Questions

 

 CBSE (NCERT) Science (Chemistry)
Chapter 3, Atoms and Molecules
Sample Questions
Q.1: What are the ‘laws of chemical combination’?
Q.2: Explain the ‘Law of Conservation of Mass’.
Q.3: What is the Law of Constant Proportion ?
Q.4: What are the postulates of Dalton’s Atomic Theory of matter ?
Q.5: What is the full form of IUPAC ? What is the present accepted norm of IUPAC for naming symbols of elements ?   
Q.6: Write the names of symbols of five elements where the symbols are taken from their name in English.  
Q.7: Write the names of symbols of five elements where the symbols are taken from their name in a language other than English.
Q.8: Define and explain atomic mass of an element.
Q.9: Distinguish between a ‘molecule’ and a ‘compound’.
Q.10: Define: (a) Atomicity (b) Ion (c) Molecular Mass (d) Relative Formula Mass
Q.11: What is valency ? Mention use of valency.
Q.12: What are the rules of writing a chemical formula? or, How is a molecular formula of a compound written ?
Q.13: Give the chemical name, chemical formulae for the following compounds having common names:
Baking soda, Washing soda, Blue vitriol, Green vitriol, Gypsum, Oil of vitriol or White vitriol, Soda ash, Marble, Lime water.
Q.14: Name the smallest particle that has all the properties of an element.
Q.15: How many ions are present in one mole of ions ?  
See answers and More on this chapter   
Class IX, Atoms and Molecules - NCERT Text Book Exercise Solution [Read]

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