Page 1 - HA-2-Practice Worksheet
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SAI INTERNATIONAL SCHOOL
                                                      Class - VI
                                               Subject - Chemistry
                                          Topic – Changes Around Us
            Sub-Topic – Physical Change, Chemical Change, and their Properties

                                                Practice Worksheet


          Q.                                       Questions                                       Mark  Skill
         No.
                Choose the correct option from the following for Questions 1, 2 and 3:
                    a)  If both Assertion and Reason are correct and Reason is the correct
                        explanation of Assertion.
                    b)  If  both  Assertion  and  Reason  are  correct,  but  Reason  is  not  the
                        correct explanation of Assertion.
                    c)  If Assertion is correct but Reason is incorrect.
                    d)  If Assertion is incorrect but Reason is correct.
                    e)  If Assertion & Reason both are incorrect.

          1.    Assertion (A): Peeled and unpeeled banana doesn't look same.                         1      U
                Reason (R): Peeling of banana is a chemical change.
          2.    Assertion (A): Ripening of fruits is an irreversible change.                         1      U
                Reason (R): We cannot get unripe fruit from ripped one.
          3.    Assertion (A): The change of water from liquid to steam on heating is a              1      U
                physical change.
                Reason (R): Conversion of liquid into steam is called evaporation.
          4.    Which of the following is incorrect about physical changes?                          1      K
                    a)  No new substance is formed.
                    b)  Are reversible changes.
                    c)  Change in size is a physical change.
                    d)  Change in composition.
          5.    Give one example of a desirable and an undesirable change.                           1      C
          6.    Some changes are listed below. For each change write whether the change              3      C
                can be reversed or not. : (YES/NO)
                               Change                       Can be reversed (Yes/No)
                a.      Sawing a piece of wood                     (Yes/No)
                b.      Melting of ice candy                       (Yes/No)
                c.      Dissolving sugar in water                  (Yes/No)
                d.      Cooking of food                            (Yes/No)
                e.      Ripening of a mango                        (Yes/No)
                f.      Souring of milk                            (Yes/No)
          7.    Give one word answers for the following questions:                                   3      A
                     a)  This type of change does not change the internal structure.
                     b)  It helps converting a solid into liquid.
                     c)  In this process, water vapour changes into water.
          8.    When is a change said to have taken place in a material? Explain with the            3      C
                help of an example.
          9.        a)  Is  it  possible  that  the same materials may undergo  reversible  and      5      C
                        irreversible changes? Give two examples in support of your answer.
                    b)  Why is getting a new hair cut considered to be a physical change?



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