Chemical changes


 
 
Concept Explanation
 

Chemical Changes

Chemical Change:

A chemical change occurs when two or more chemical substances react to produce new substance with a different set of properties. It is permanent which cannot be reversed. Examples:

  • Reddish – Brown Decomposition on Iron Objects: Iron reacts with atmospheric oxygen in the presence of moisture to form a reddish-brown layer of iron oxide. This layer is called rust and process is called rusting. Oxygen and water are the two essential conditions for rusting of iron. 
  • Browning of Vegetables and Fruit Surfaces: When we exposed the cut surface of a brinjal to the air for some time, the surface has turned brown, due to a chemical reaction between certain compounds present in brinjal and atmospheric oxygen to produce a brown colour pigment “melanin” that cause browning of the surface. 
  • Reaction Between Vinegar and Baking Soda: Vinegar + Baking soda  rightarrow  carbon dioxide + water + other substances. To test carbon dioxide gas, Carbon dioxide + lime water(calcium hydroxide)  rightarrow   calcium carbonate + water.
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    Sample Questions
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    Question : 1

    A chemical change may involve :

    Right Option : D
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    Question : 2

    Which of the following is not an example of a chemical change?

    Right Option : B
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    Question : 3

    Match column - I with column - II and select the correct answer using the codes given below the columns.

    Column - I Column - II
    (A)Heat energy is evolved during the reaction (p) Physical change
    (B) Heat energy is absorbed (q) Chemical change
    (C) Digestion of food in the body (r) Exothermic reaction
    (D) Melting of wax  (s) Endothermic reaction

                               

    Right Option : D
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