Page 1 - 4.HOME ASSIGNMENT-(DALTON'S ATOMIC THEORY AND ITS DRAWBACKS)
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SAI International School
                                                       Class-IX
                                                Subject-Chemistry
                                          Topic-Atoms and molecules
                          Sub topic-Dalton's atomic theory and its drawbacks
                                               HOME ASSIGNMENT

               OBJECTIVE QUESTIONS
               Q.1      Assertion: All the atoms of sodium have same mass
                        Reason: Atoms of an element are alike.

               Q.2      Assertion: Atoms are the smallest particle of matter.

                        Reason: Atoms are the building blocks of an element

               Q.3      Assertion:  Carbon dioxide molecule contain one atom of carbon and two
                        atoms of oxygen combined chemically by mass.
                        Reason: Molecules contain same or different atoms joined chemically in
                        fixed proportion by mass.
               Q.4      Assertion:Atoms can neither be created nor be destroyed.
                        Reason: Law of conservation of mass states that mass can neither be
                        created nor be destroyed.
               Q.5      Assertion: Atoms of same element may be different

                        Reason: Isotopes are the atoms of same element.
               Q.6      Which of the following is not something that Dalton discovered?
                           a)  The law of partial pressure
                           b)  Atomic theory
                           c)  That colour blindness is hereditary
                           d)  That the earth rotates around the sun
               Q.7      Which of the following is not part of Dalton's atomic theory?
                           a)  All matter is made up of small particles called atoms.
                           b)  A chemical reaction is a rearrangement of atoms.
                           c)  Nuclear fission is a possibility.
                        All atoms of a certain element are identical.


               SUBJECTIVE QUESTIONS
           S.LNo.  Questions                                                                   Mark    Skill
           Q.1       How  can  Dalton’s  atomic  theory  explain  the  Law  ofConstant  1              Av/U
                     Proportions
           Q.2       Which postulate of Dalton’s atomic theory is the result of the law of     1       E/R
                     conservation of mass?
           Q.3       State significant postulates of Dalton’s Atomic Theory of Matter and  3           Av/U
                     and state how they explain the laws of chemical combinations.
           Q.4       a) Give two drawbacks of Dalton’s atomictheory.                           3       Av/U

                     b) State one merit of Dalton’s atomic theory.







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