8,9 - 1 Chem 11500 Lectures 8 and 9 Reading: 8.2, 8.3, 2.7,...

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Unformatted text preview: 1 Chem 11500 Lectures 8 and 9 Reading: 8.2, 8.3, 2.7, 2.8 2 This week in Chemistry • Exam 1 results on Thursday • Complete the CHEMX and MCAI surveys • Complete homework by Friday • Attend lecture, lab, recitation • Laboratory this week! 3 This week • Prepare alum, KAl(SO 4 ) 2 12H 2 O and find the % yield. • Techniques: Filtration and crystallization • Work in pairs • Lab safety . 4 Think/Pair/Share question #1 Which is the smallest atom? a. As b. Ba c. Ca 5 Distance, r 3s orbital Atomic Radii are impossible to identify for isolated atoms Where does this orbital end? 6 Metallic and covalent radii are determined from distances between atoms 7 Increase Atomic radii (pm) of the main-group elements Increase Z eff increases n dominates What are the trends and influences? Two influences 8 Think/Pair/Share question #2 Which has the largest 1st IE? a. Mg b. S c. Te 9 First Ionization energy • Ionization energy of first 40 elements. • What trends do you notice among the Noble Gases? • What trends do you notice among the Alkali Metals? Ionization Energy (IE) ______________ 10 Radii in red Periodicity of first ionization energy (IE 1 ) IE in black Smaller atoms have higher 1 st I.E.s 11 Electron Affinity • Atom (gaseous) + electron --> ion The electron affinity EA is the change in the energy accompanying the addition of an electron to a gaseous atom (or ion)...
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This note was uploaded on 02/17/2012 for the course CHM 115 taught by Professor Towns during the Fall '08 term at Purdue University-West Lafayette.

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8,9 - 1 Chem 11500 Lectures 8 and 9 Reading: 8.2, 8.3, 2.7,...

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