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Assignment #33

Assignment #33. Polarity & Naming Covalent Compounds. There can be UNEQUAL sharing of electrons in a bond. DRAW the Lewis Dot Structure for: HF. Polarity of Bonds Electronegativity δ + and δ - Dipoles. BOND TYPE BY ELECTRONEGATIVITY 0-0.4 nonpolar >0.4 is polar ≥2.0 is ionic.

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Assignment #33

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  1. Assignment #33 Polarity & Naming Covalent Compounds Regular Chemistry

  2. There can be UNEQUAL sharing of electrons in a bond • DRAW the Lewis Dot Structure for: • HF • Polarity of Bonds • Electronegativity • δ+ and δ- • Dipoles • BOND TYPE BY ELECTRONEGATIVITY • 0-0.4 nonpolar • >0.4 is polar • ≥2.0 is ionic Regular Chemistry

  3. Which represents a polar bond? • P-H or S-O Regular Chemistry

  4. Let’s do MORE! • NH4+ • CH3OH (methanol) • H2CO (formaldehyde) • SO2 • HCN Regular Chemistry

  5. Exceptions in Lewis Structures • B BF3 • P PCl5 • S SF6 • ODD # valence electrons • Example NO Regular Chemistry

  6. Covalent Compounds • Nonmetal + nonmetal • DO NOT BE FOOLED: HC2H3O2 • Its is an ACID that we will learn next class Regular Chemistry

  7. 1 mono 2 di 3 tri 4 tetra 5 penta 6 hexa 7 hepta 8 octa 9 nona 10 deca 11 hendeca 12 dodeca 13 triskaideca 14 tetrakaideca 15 pentakaideca 16 hexakaideca 17 heptakaideca 18 octakaideca 19 enneakaideca 20 icosa 24 icositetra 30 triconta or triaconta 40 tetraconta 50 pentaconta 60 hexeconta (or hexaconta) 70 heptaconta 80 octaconta 90 enneaconta 100 hecto or hecato Naming Covalent Compounds Regular Chemistry

  8. 1 mono 2 di 3 tri 4 tetra 5 penta 6 hexa 7 hepta 8 octa 9 nona 10 deca Page 246 N2O4 Dinitrogen tetroxide Prefixes + -ide ending Don’t Like “ao” together CO Carbon monoxide Never Use Mono On First Element Don’t Like “oo” together NCl3 Nitorgen trichloride Dichlorine heptoxide Cl2O7 Naming Covalent Compounds Regular Chemistry

  9. Try these • Write the formula: • Phosphorus pentachloride • PCl5 • Dihydrogen monoxide • H2O • Nitrogen triiodide • NI3 • Name the following • NO • Nitrogen monoxide • N2O • Dinitrogen monoxide • NO2 • Nitrogen dioxide • SF6 • Sulfur hexafluoride Regular Chemistry

  10. Summary • Naming Covalent Molecules uses Prefixes to tell the number of each atom present (Page 246) • Never use “mono” for the first element • “oo” and “oa” naming rule Regular Chemistry

  11. Summary • Polarity of Bonds • Electronegativity • δ+ and δ-, and dipoles • >0.4 is polar • ≥2.0 is ionic Regular Chemistry

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