One fission reaction for U-235 is represented by the
balanced nuclear equation below.
Both radioisotopes produced by this fission reaction
undergo beta decay. The half-life of Xe-140 is 13.6 seconds and the
half-life of Sr-94 is 1.25 minutes.
62 Explain, in terms of both reactants and products, why
the reaction represented by the nuclear equation is a fission reaction.
|Answer--> One large atom split into smaller atoms.
63 Complete the equation in your answer booklet for the
decay of Xe-140 by writing a notation for the missing product. 
64 Determine the time required for an original 24.0-gram
sample of Sr-94 to decay until only 1.5 grams of the sample remains
|Answer--> 5.00 min
Use table N.....Work not
24.0g--> 12.0g--> 6.0g-->3.0g-->1.5g
4 half lives x 1.25 min=5.00 min
65 On the diagram in your answer booklet, draw an
arrow to represent the path of an emitted beta particle in the
electric field between two oppositely charged metal plates.