Unit 11: Nuclear Chemistry Section 1: “It’s da bomb!” – Fission and Fusion Reactions

Quick Review (Not on Notes) Nucleus Centermost part of an atom Composed of protons and neutrons Protons – Positive Charge Neutrons – Neutral Charge Surrounded by electrons Electrons – Negative Charge

The Imperfect Atom  Atoms can gain or lose neutrons. This makes it an isotope When an atom becomes an isotope, it is VERY UNSTABLE! An unstable nucleus is likely to split apart or fuse with another nucleus, depending on the circumstances resulting in nuclear fission or nuclear fusion.

Fission Reactions Nuclear Fission – the process where the nucleus of an atom is struck with a neutron and splits into smaller fragments. Usually uses Uranium as a fuel source

Nuclear Fission – Chain Reaction

Fission Reaction – The Nuclear Bomb

Fusion Reactions Nuclear Fusion – the combination of two nuclei to create a nucleus with a greater mass. On the sun, Hydrogen isotopes fuse to form Helium atoms. Fusion only occurs at VERY high temperatures 40,000,000 ˚C… OY, THAT’S HOT!!! Does this appear to be an easy energy source here on Earth?

Nuclear Fusion H He H 2 1 4 2 3 1

Fission vs. Fusion Reactions

Summary Summarize the idea of nuclear chemistry and the topics of fusion and fission. Write in complete sentences… and remember you WILL have an audience for this writing (a partner) so think carefully about what you write! 