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Question

(a) What is a chemical reaction.

(b) State the condition necessary for a chemical change or a reaction to take place.


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Solution

(a) Chemical reaction - A reaction in which one or more substances undergo a chemical change with the liberation or absorption of energy to form one or more new substances, which is collectively known as chemical change.

Example - When acid and base react with each other it forms salt and water.NaOH(s)+HCl(aq.)NaCl(s)+H2O(l)SodiumhydroxideHyrochloricacidSodiumchlorideWater

(b) Condition necessary for a chemical change -

  • A chemical change occurs when the collision of particles takes place.
  • The collision occurs when reactants are in close contact with energy.
  • One or more conditions are necessary for a chemical reaction to take place.
  1. Mixing - In some cases chemical reactions take place when two substances are mixed with each other.
  2. Solution - In some cases chemical reactions take place when two solutions are mixed with each other.

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