Documents
Resources
Learning Center
Upload
Plans & pricing Sign in
Sign Out

25

VIEWS: 0 PAGES: 11

									CHEMISTRY DEPARTMENT
   WAID ACADEMY




 Radioactivity
 Radioactive calcium would differ from
 ordinary (non-radioactive) calcium in its                                      20

1.   atomic mass.
2.   chemical properties.
3.   atomic number.
4.   electron arrangement.
                                          0%             0% 0%                   0%




                                                                     r.
                                                     s.




                                                                                  t.
                                         s.




                                                                                 en
                                                                be
                                                   tie
                                       as




                                                                                m
                                                               m
                                                 er
                                   m




                                                                           ge
                                                              nu
                                                 p
                                  ic



                                              ro




                                                                            n
                              om




                                                          ic



                                                                         ra
                                             p


                                                         om



                                                                       ar
                                          al
                             at



                                         ic



                                                     at




                                                                       n
                                       em




                                                                   tro
                                                               ec
                                   ch




                                                              el
  What is the result of an atom losing a
  beta-particle?                                                                            25

1.   Atomic number unchanged,
     mass number increased by 1.
2.   Atomic number decreased by 2,
     mass number decreased by 4.
3.   Atomic number increases by 1,
     mass number unchanged.
4.   Atomic number decreased by 1,                          0% 0% 0% 0%
     mass number unchanged.




                                                                                    .
                                                                     .




                                                                                                .
                                                      ...




                                                                                 r..
                                                                 r..




                                                                                            r..
                                                   nc




                                                                              nc
                                                                ec




                                                                                        ec
                                                 ru




                                                                            ri
                                                            rd




                                                                                       rd
                                                                          be
                                               be



                                                          be




                                                                                     be
                                                                         m
                                              m



                                                         m




                                                                                    m
                                                                     nu
                                          nu



                                                      nu




                                                                                 nu
                                                                 ic
                                         ic



                                                    ic




                                                                               ic
                                                                m
                                        m



                                                   m




                                                                              m
                                                             to
                                     to



                                                to




                                                                           to
                                                            A
                                 A



                                               A




                                                                          A
 The process shown below represents                                        25


1.   nuclear fission.
2.   nuclear fusion.
3.   proton capture.
4.   beta emission.

                                       0%          0%          0%              0%

                                    n.




                                                                e.
                                                   .




                                                                               .
                                                   n




                                                                             n
                                                              ur
                                  io




                                                io




                                                                          io
                                   s



                                              us




                                                                           s
                                                            pt
                                is




                                                                        is
                                                          ca
                                            rf
                              rf




                                                                      em
                                           ea
                            ea




                                                       on




                                                                     ta
                                         cl
                          cl




                                                     ot



                                                                 be
                                       nu
                         nu




                                                   pr
  Beta-particles emitted by certain
  radioactive atoms are                                                                                         25


1.   electrons from the nucleus.
2.   electrons from the outer electron
     energy level.
3.   particles consisting of 2 protons
     and 2 neutrons.
4.   electromagnetic radiation of                                  0% 0% 0% 0%
     very high energy.




                                                                                                                    .
                                                                                  t..



                                                                                                   ..
                                                              ...




                                                                                                                   ..
                                                                                                 o.



                                                                                                                di
                                                                            ou
                                                          nu




                                                                                                               ra
                                                                                            g
                                                                                            in
                                                                         e
                                                        e




                                                                                                          ic
                                                                      th
                                                     th




                                                                                          st



                                                                                                           t
                                                                                                        ne
                                                                                        si
                                                                      m
                                                     m




                                                                                      n
                                                                  fro




                                                                                                    ag
                                                 fro




                                                                                   co



                                                                                                   m
                                                              s
                                            s




                                                                                s
                                                              n




                                                                                               tro
                                             n




                                                                             le
                                                          tro
                                         tro




                                                                             ic



                                                                                           ec
                                                         ec



                                                                          rt
                                     ec




                                                                                          el
                                                                     pa
                                                    el
                                    el
 Plants take in radon with water through their roots.
 Compared with radon in the water, the half-life of the                           25
 radon in the plant cells will be


1. shorter.
2. longer.
3. dependent on the size of the
   plant.
4. the same.
                                                0% 0% 0% 0%




                                               .




                                                                                    e.
                                                           r.
                                                r
                                             te



                                                            e



                                                                        ..



                                                                                   m
                                                         ng



                                                                       z.
                                           or




                                                                                  sa
                                                                     si
                                                     lo
                                          sh




                                                                              e
                                                                    e


                                                                             th
                                                                 th
                                                                on
                                                           nt
                                                            e
                                                         nd
                                                     pe
                                                    de
The half-life of the isotope 14C is 5.5 x 103years.
What fraction of the original 14C atoms will be                  25
present after 2.2 x 104years?


 1.   0.5
 2.   0.25
 3.   0.125
 4.   0.0625


                                         0%      0%      0%      0%




                                                        5
                                                25
                                     5




                                                                25
                                                        12
                                   0.




                                              0.




                                                                06
                                                      0.




                                                              0.
 A radioactive atom of a Group 5 element
 emits one beta-particle. The decay product                                 25
 will be an atom of an element in


1.   Group 4
2.   Group 5
3.   Group 6
4.   Group 7


                                      4   0%           0%          0%       0%


                                                      5




                                                                   6




                                                                               7
                                  p




                                                   p




                                                                p




                                                                            p
                                  u




                                                  u




                                                               u




                                                                           u
                               ro




                                               ro




                                                            ro




                                                                        ro
                              G




                                               G




                                                            G




                                                                        G
 The stability of the nucleus of an ion
 depends on the ratio of                                                                 25


1.   neutrons : protons
2.   mass : charge
3.   neutrons : electrons
4.   protons : electrons
                                                 0%         0%            0%             0%



                                            s




                                                           e



                                                                            s



                                                                                           s
                                             n



                                                        rg



                                                                         on



                                                                                        on
                                          to



                                                       ha




                                                                      tr



                                                                                     tr
                                       ro




                                                                      c



                                                                                     c
                                                     :c



                                                                   le



                                                                                  le
                                      :p




                                                                 :e



                                                                                :e
                                                   s
                                 s



                                                 as
                                  n




                                                               s



                                                                              s
                               ro




                                                 m




                                                             n



                                                                           on
                                                          ro
                             ut




                                                                        ot
                                                        ut
                            ne




                                                                      pr
                                                       ne
 Which of the following has an electrical
 charge?                                                                   25


1.   X-rays.
2.   alpha-particles.
3.   Neutrons.
4.   gamma-rays.

                                    0%            0%          0%           0%




                                                                            s.
                                                  .



                                                             s.
                                  .




                                                  s
                               ys




                                                                             y
                                               le




                                                              n



                                                                          ra
                               ra




                                                          tro
                                             ic




                                                                       a-
                             X-




                                          rt



                                                      eu




                                                                    m
                                          pa




                                                      N




                                                                   m
                                        a-




                                                                  ga
                                      ph
                                    al
 The chart below was obtained from an 8-day old
 sample of an alpha-emitting radioisotope.                        25
 What is the half-life of the radioisotope?


1.   2 days
2.   4 days
3.   8 days
4.   12 days


                                      0%       0%       0%        0%




                                                                  s
                                     ys




                                             ys




                                                      ys




                                                                 y
                                   da




                                           da




                                                    da




                                                              da
                                                             12
                                  2




                                           4




                                                    8

								
To top