ENGR 220 Ch02_ppt_Callister8e RK Part 1

ENGR 220 Ch02_ppt_Callister8e RK Part 1 - 9/21/11 CHAPTER...

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9/21/11 1 Chapter 2 - 1 ISSUES TO ADDRESS. .. What promotes bonding between atoms? What types of bonds are there? What properties are inferred from bonding? CHAPTER 2: BONDING AND PROPERTIES Chapter 2 - 2 ± Reading: Chapter 2, and Bonding in Solids ” handout (download from Bb Vista & read it!) ± Recitations: Week 2 Recitation Problems: #s: 2.8, 2.11, 2.13, 2.17, 2.18, 2.21, 2.22 Solutions to Problem #’s 2.14 and 2.20 should be prepared and handed in during Week 3 Recitation and will count as Quiz 1 ANNOUNCEMENTS
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9/21/11 2 Chapter 2 - 3 Atomic Structure (Freshman Chem.) P Atom – electrons 9.11 x 10 -31 kg protons neutrons ± Atomic Number: – # of protons in nucleus of atom – # of electrons of neutral species P A [=] atomic mass unit = amu = 1/12 mass of 12 C ± Atomic wt. = wt. of 6.023 x 10 23 molecules or atoms: 6.023 x 10 23 atoms of C weigh? 12.011 gm 6.023 x 10 23 atoms of H weigh? 1.008 gm C 12.011 H 1.008 etc. 1 amu/atom = 1 g/mol. } 1.67 x 10 -27 kg Chapter 2 - 4 Atomic Structure P Valence electrons determine all of the following properties: 1) Chemical 2) Electrical 3) Thermal 4) Optical
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9/21/11 3 Chapter 2 - Major Outcomes of Quantum Theory P Confining a particle results in quantization of the energy Schrödinger Equation P No two particles can have the same quantum numbers. Pauli’s exclusion principle leads to periodic table P It is not possible to simultaneously know both the momentum (velocity) and position of a particle with great accuracy: – Heisenberg’s uncertainty principle: p x = h – p = momentum – h = Planck’s constant 5 Chapter 2 - 6 Quantum Mechanics P Govern atomic/sub-atomic particle behavior P Detailed treatment beyond scope of course P Simple, early model Bohr atomic model: – assumed e - revolve around nucleus in discrete orbitals – Only certain energy levels allowed ( quantized
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ENGR 220 Ch02_ppt_Callister8e RK Part 1 - 9/21/11 CHAPTER...

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