(a)[2]
State what nuclear fission means.
(b)[3]
The nuclear fission reaction produces neutrons. In the power station, the neutrons may be taken up by rods made of boron-10. Complete the nuclear equation for the capture of one neutron by a boron-10 nucleus with emission of an $\alpha$-particle: $^{10}_{5}\text{B} + \ldots \rightarrow \ldots ^{7}_{3}\text{Li} + \ldots$.
(c)[3]
Suggest why the boron rods get hot when neutrons are absorbed in them during this nuclear reaction.