31. A uranium-235 nucleus is struck by a neutron with ordinary thermal energy. An unstable uranium-236 nucleus is formed, but it breaks into two fragments with the release of several neutrons. The neutrons can induce the fission of other uranium-235 nuclei. FISSION
![Nuclear Reactions vs. Normal Chemical Changes ,[object Object],CHEMICAL REACTIONS NUCLEAR REACTIONS Bonds are broken and formed Nuclei emit particles and/or rays Atoms remain unchanged, only rearranged 2H 2 + O 2 2H 2 O Atoms are changed into other atoms of different elements Involve valence electrons Involves the nucleus, P + , N 0 , e- Small energy changes large energy changes ( BINDING Energy) Rate influenced by conc, temp., pressure and catalyst Not affected by those](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)