CHEM131: Nuclear Chemistry (Part 7)

Introduction to Nuclear Fission00:00:00

The video begins by explaining that heavy nuclei gain stability and release energy when split into smaller nuclei, a process known as nuclear fission. The resulting smaller nuclei are called fission products.

Discovery and Mechanism00:01:33

The first reported fission occurred in 1939 when German scientists Otto Hahn, Fritz Strassmann, and Lise Meitner bombarded uranium-235 with neutrons. The process involves a neutron striking a nucleus, causing deformation and a rapid breakup that releases energy, gamma rays, and additional neutrons.

Chain Reactions00:05:24

The neutrons produced during fission can trigger further fission events in nearby uranium-235 atoms, creating a fission chain reaction. If unchecked, this escalates rapidly into a tremendous explosion, such as those seen in atomic bombs.

Critical Mass and Applications00:08:03

The video discusses subcritical, critical, and supercritical masses. While uncontrolled chain reactions lead to nuclear explosions using uranium-235 or plutonium-239, controlled reactions are used to produce clean nuclear energy without greenhouse gas emissions.