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Classification of Change: Chemical Changes

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notes

CHEMICAL REACTION:-

A process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds.

TYPES OF CHEMICAL REACTION:-

Type of reaction Definition Equation
Combination Two or more elements or compounds combine to make a more complex substance. A + B = AB
Decomposition Compounds break down into simpler substances. AB = A + B
Replacement Occurs when one element replaces another in a compound AB + C = AC + B
Double replacement Occurs when different atoms in two different compounds trade places AB + CD = AC + BD

Change of:

  • Colour
  • State
  • Smell
  • Evolution of gas
  • Precipitate formed
  • Heat evolved / released

 

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