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8,9 - Chem 11500 Lectures 8 and 9 Reading 8.2 8.3 2.7 2.8 1...

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1 Chem 11500 Lectures 8 and 9 Reading: 8.2, 8.3, 2.7, 2.8
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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!
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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 .
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4 Think/Pair/Share question #1 Which is the smallest atom? a. As b. Ba c. Ca
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5 Distance, r 3s orbital Atomic Radii are impossible to identify for isolated atoms Where does this orbital end?
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6 Metallic and covalent radii are determined from distances between atoms
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7 Increase Atomic radii (pm) of the main-group elements Increase Z eff increases n dominates What are the trends and influences? Two influences
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8 Think/Pair/Share question #2 Which has the largest 1st IE? a. Mg b. S c. Te
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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) ______________
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10 Radii in red Periodicity of first ionization energy (IE 1 ) IE in black Smaller atoms have higher 1 st I.E.s
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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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