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SAI International School

                                                     Class – VIII
                                               Subject – Chemistry
                               Topic – SYNTHETIC FIBRES AND PLASTICS
                  Sub-topic – Plastics and Its Types, Useful Properties of Plastic,
                                            Plastic and Environment


                                            PRACTICE WORKSHEET
        Q. No.                                            Questions
                  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): Unbalanced chemical equations are known as skeletal equations.
                  Reason (R):It is because there is only chemical formula of reactants and products but
                  no state mentioned and no balancing of atoms.
           2.     Assertion (A): Thermosetting plastics have a linear arrangement of monomers.
                  Reason (R):Linear arrangement of polymer helps in preventing displacement of
                  polymer chains on being heated.
           3.     Assertion (A):Synthetic fibres are wrinkle resistant.
                  Reason (R): Synthetic fibres absorb very less water.
           4.     Which of the following fibre is considered best for making water hoses and magnetic
                  recording tapes?
                  a) Polyester          b) Nylon      c) Acrylicd) Terrycot
           5.     Match column I with column II and select the correct answer from the givenoptions:
                                Column I                                           Column II
                  P.     Magnetic recording tapes                                  (i)    Acrylonitrile
                  Q.     Polymer used in sweaters and shawls                       (ii)   Bakelite
                  R.     Non-stick cookware                                        (iii)   Mylar
                  S.     Poor conductor of heat and electricity                    (iv)   Teflon
                      a)  P - (iv), Q - (ii), R - (iii), S - (i)
                      b)  P - (iii), Q - (i), R - (iv), S - (ii)
                      c)  P - (ii), Q - (iii), R - (i), S - (iv)
                      d)  P - (iii), Q - (i), R - (ii), S - (iv)
           6.     Explain why plastic containers are favoured for storing food?
           7.     State three differences between metals and non-metals on the basis of their chemical
                  properties.
           8.         a)  Define ‘Thermosetting plastics’.
                      b)  Bakelite is used for making electrical switches, plugs and sockets. Give reason.
           9.     Explain ‘Reactivity Series of Metals’.
          10.     Give two uses of the following synthetic fibres:
                      a)  Bakelite
                      b)  Acrylic
                      c)  Nylon
                      d)  PVC
                      e)  Teflon


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