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Nuclear Chemistry

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kaya
12 diapositives · 276 Views · Aug 08, 2014

This overview of nuclear chemistry explores the fundamental forces acting within the nucleus, such as the strong nuclear force and electric repulsion among protons. Key scientists like Henri Becquerel, Marie and Pierre Curie, and Ernst Rutherford made significant contributions to our understanding of radioactivity and nuclear decay. We'll discuss the factors determining nuclear stability, including the neutron-to-proton ratio and binding energy, as well as the different types of nuclear reactions like fission and fusion. Learn about the particles involved in nuclear decay and the importance of balancing nuclear equations.

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Nuclear Chemistry
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  1. Nuclear Chemistry

  2. Two main forces in nucleus • Strong nuclear force—all nuclear particles attract each other • Electric forces—protons repulse each other • Like charges repel

  3. Key Scientists • Henri Becquerel • X ray emission by uranium compounds • Marie and Pierre Curie • Discovered radium, polonium • Ernst Rutherford • Alpha particles

  4. What determines stability? • Balance between strong force and electric force • Neutron:proton ratio in nucleus • Most stable between 1:1 and 1.5:1 • Binding energy • Energy released when a nucleus is formed from nucleons

  5. Unstable Nuclei • Most atoms have stable nuclei. • All elements with atomic number ≥84 are unstable. • Unstable nuclei (i.e., “radioactive” nuclei) undergo spontaneous change, giving off energy or particles when they change.

  6. Nuclear Reactions • 3 basic types • Transmutation • nucleus of one element is transformed into nucleus of different element • Aka radioactive decay or nuclear decay • Nuclear reactions affect the nucleus of an atom

  7. More Nuclear Reactions • Fission: a very heavy nucleus splits into two smaller nuclei • Fusion: two nuclei with small masses combine to form heaver, more stable nuclei

  8. Particles in Nuclear Decay • 3 main types • Alpha particles • 2 protons, 2 neutrons—a helium nucleus • +2 nuclear charge • Cannot penetrate skin; dangerous if ingested • Can be stopped by a piece of paper

  9. Nuclear Particles, cont. Beta particles • An electron emitted from the nucleus • -1 charge • Symbol • Fast moving, can penetrate into skin • Can be stopped by lead or glass Gamma particles • High energy electromagnetic waves emitted from nucleus • No mass, no charge • Symbol • Very penetrating; may not be stopped by several feet of concrete

  10. More Nuclear Particles • Positrons • Mass of electron, positive charge • Neutrons • 1 amu, no charge • Protons • 1 amu, +1 charge

  11. Balancing Nuclear Equations • Both mass and charge must be conserved. • Sum of masses must be the same on both sides of arrow. • Sum of charges must be the same on both sides of arrow. • Deduce the identity of the missing chemical species in the reaction.

  12. Balancing a Nuclear Reaction • Uranium-238 spontaneously decays by emitting an alpha particle. • Find mass of unknown • Find atomic number of unknown • Find symbol of unknown