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January 19, 2010

January 19, 2010. Warm-Up: How did you get your name, and does it mean anything special? How can I tell if it is ionic or covalent? Naming the different compounds Preview of Wednesday-molecular models. 1736 James Watt 1809 Edgar Allan Poe 1813 Henry Bessemer 1837 William Keen

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January 19, 2010

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  1. January 19, 2010 • Warm-Up: How did you get your name, and does it mean anything special? • How can I tell if it is ionic or covalent? • Naming the different compounds • Preview of Wednesday-molecular models • 1736 James Watt • 1809 Edgar Allan Poe • 1813 Henry Bessemer • 1837 William Keen • 1894 Dewar shows off solid air • 1944 M. Lee Goff

  2. Is it ionic? • Are the two elements from different blocks, like s & p, or d & p, or f & p? • If so, it will be an ionic compound. If not, most likely a covalent compound. • D & f-block elements have + oxidation numbers, like s-block. Why do you think these generally don’t combine with each other.

  3. The difference is important • Ionic and covalent compounds have very different properties, so we need to be able to predict and know the difference. • One way to tell the difference, if we know the formula, is by the name.

  4. 1-mono, as in monorail, monopoly 2-di 3-tri 4-tetra 5-pent 6-hex 7-hept 8-oct 9-non 10-dec 11-hendec 12-dodec One Reminder about numbers

  5. Naming differences CCl4 This is covalent, the name is carbon tetrachloride NaCl This is ionic, the name is sodium chloride Mg3N2 This is ionic, and the name is magnesium nitride N2O5 This is covalent, and the name is dinitrogen pentoxide

  6. MgO SO2 Na2S CaBr2 PCl5 SeF6 Li3N Magnesium Oxide Sulfur Dioxide Sodium Sulfide Calcium Bromide Phosphorus Pentachloride Selenium Hexaflouride Lithium Nitride Name the following, please

  7. Wednesday • How do models help? • We get to use our hands. • They help us remember how many bonds each element can form. • They help us see the 3-D difference, which is very important.

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