notes_Lecture_21_112910

notes_Lecture_21_112910 - Lecture 21 Chemical Bonding...

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Lecture 21: Chemical Bonding Reading: Zumdahl 13.1-13.2 Read all sections of Ch 13 – this is different than what the reading schedule says in the syllabus; sections 13.6 and 13.7 will not be addressed specifically in lecture but you should still read them Problems for Extra Practice – 11, 13, 17, 19, 21, 23, 25, 27 (Chapter 13) Outline – Types of chemical bonds (13.1) – Electronegativity (13.2)
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Chemical Bonds • In 142, you learned about the nuclear structure (protons and neutrons) of atoms. • Here in 152, you have learned a little about the electronic structure of atoms. • Next, we will discuss the chemical bond …a term used to characterize an interaction between two atoms that results in a reduction in the energy of the system relative to the isolated atoms . • The degree of energy reduction or “stabilization” is given by the “bond energy” , the energy required to break the bond. • This stabilization is achieved by the interaction of the electron densities on neighboring atoms.
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Chemical Bonds (cont.)
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Chemical Bonding Chemical bonds are formed when atoms share their valence electrons.
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2 (g), a rapid and very exothermic reaction occurs, resulting in a white, granular solid. If this solid is melted, it will conduct electricity, indicating that it contains charged species: Na + and Cl - . Chemical Bonds (cont)
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notes_Lecture_21_112910 - Lecture 21 Chemical Bonding...

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