Physical Change


 
 
Concept Explanation
 

Physical Change

Physical Change or reversible changes :

  • 1.  When no new substance is formed after the change, it is called physical change.
  • 2.  Physical changes are usually reversible.
  • 3.  Examples: Melting of ice, melting of wax, etc.
  • 4.  Burning of candle is a chemical change because melted wax solidifies on cooling. However, when a candle burns, the wax is undergoing two changes at the same time: First, it melts and second, it burns.
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    Sample Questions
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    Question : 1

    Which of the following are correct ?

    (a)  A physical change is the one that changes the shape, size, physical state or appearance of substance but not its chemical composition

    (b) In a physical change no new substance is formed .

    (c) Formation of dew, Drying if wet clothes, Breaking of glass, Bending of glass tube are examples of physical change:

    Right Option : D
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    Question : 2

    Which of the following are correct :

    (a) Stretching of rubber band is an example of physical changes.

    (b) When water boils it changes into steam ad when this steam cools down it again changes into  liquid water.   

    (c) Burning of candle is a chemical change because melted wax solidifies on cooling.

    Right Option : D
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    Question : 3

    Which of the following are correct :

    (a) When no new substance is formed after the change, it is called physical change.

    (b) Physical changes are usually reversible.

    Right Option : C
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