1.

What is a compound? How are compounds formed?

Answer»
  • A compound is a substance formed when two or more elements are chemically bonded with each other in definite proportion by weight. 
  • When atoms or two or more different elements chemically react with each other in a definite proportion by weight, a compound is formed.
  • The properties of a compound are altogether different from its constituent elements.
  • Example: Pure water is a compound made up of two elements Hydrogen and Oxygen. Hydrogen (H) atoms and oxygen (O) atoms have chemically reacted with each other in definite proportion to form a compound water (H2O). The proportion of hydrogen and oxygen in water by volume is 2 : 1 and by weight is 1 :8 respectively.
  • The properties of water are altogether different from the properties of its constituent elements, hydrogen and oxygen.


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