lect_5oct6f08

lect_5oct6f08 - Outline 5 1. Review - 14-JAN-2008 atomic...

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1 Outline 5 14-JAN-2008 1. Review - atomic & isotopic masses, PT 2. Compounds- Ionic (exchange e - ), Covalent (share e - ) a. Ionic compounds- ion charges, Names Skill: ions ↔ formula ↔ name b. Molecular (covalent) - Binary Compounds, Names Skill: formula ↔ name
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2 Modern form of the periodic table.
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3 Name________ Quiz 5 TA ______Dis. Sec._____) 1. (3) Rb has two isotopes. mass (amu) fraction 85 37 Rb 84.9 0.722 87 37 Rb 86.9 0.278 Find: avg mass = ? * ? + ? * ? = 2. (2) Write symbol of the element at intersection of : a. Group 2 and Period 3. b. Group 17 and Period 4.
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4 Compound- Substance (fixed composition, definite proportions) with two or more elements. Models Ionic – exchange e - ’s K → K + + e - ; a cation (gives e - ’s) Br + e - → Br - ; ; an anion (takes e - ’s) Covalent (molecular) share e - ’s (Ch. 9) H + Cl → H-Cl, the - represents a bond .
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5 Compounds (Formulas) Chemical formula - shows atomic symbols with subscripts indicating relative proportions of atoms of different elements in compound. Ex: Aluminum oxide, Al 2 O 3 . Formula implies compound composed of aluminum atoms and oxygen atoms in ratio 2:3 . ( Law of definite proportions (constant composition ))
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6 Anion –formed when atom picks up extra e - ’s so becomes negatively (-) charged ion, Ex: Cl + e - Cl - Compounds (Ionic) Ionic substances Cation – formed when atom loses e - ’s so becomes positively (+) charged ion. Ex: Na → Na + + e - Ionic compound - compound composed of cations and anions . . Ex: NaCl Ex: NaCl
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7 Formula - smallest whole-number ratio of different ions in substance. Compounds (Ionic) Ionic substances (Cont.) Formula unit - group of atoms or ions symbolized by formula.
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8 Molecule - group of atoms tightly connected. Compounds ( Molecular)
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This note was uploaded on 02/18/2009 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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lect_5oct6f08 - Outline 5 1. Review - 14-JAN-2008 atomic...

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