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.
[1]

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. [1]

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
unchanged. [1]

Answer--> 5.00 min
Use table N.....Work not
required
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. [1]