11/2/11

• Bell Ringer (on board): Draw the model and write the formula for the compound formed with Hydrogen and Carbon combine.

• Naming covalent compounds notes

  • Hydrogen and Carbon (and many other combinations of elements) can covalently bond in multiple ways

  • Because of this, the name needs to give us more information than just which elements were involved

  • Covalent names include number prefixes, which we use to tell how many atoms of each element are in a molecule (e.g. H2S is Dihydrogen monosulfide, where "di" and "mono" are number prefixes meaning 2 and 1, respectively)

  • Number prefixes:

  • Example: H20

    • Name will include hydrogen and oxide, but these need to have number prefixes

    • Prefix for 2 is Di, for 1 is Mono

    • This compound (water) is also named Dihydrogen monoxide

    • There is currently a hoax going on of convincing people we need to ban Dihydrogen monoxide (water!)

  • The only time we DO NOT use a prefix is if the first element named would have "mono" as the prefix. In that case, leave the prefix off.

    • Example: OF2 is Oxygen difluoride, NOT Monoxygen difluoride.

Assignment: Drawing, naming, and writing formulas for covalent compounds worksheet