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Building Compounds

Building Compounds. Ionic vs. Covalent Bonding. TO-DO Friday. Nov. 13 th 2009. Create a new journal entry called “ Building Compounds ”

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Building Compounds

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  1. Building Compounds Ionic vs. Covalent Bonding

  2. TO-DO Friday. Nov. 13th2009 • Create a new journal entry called “Building Compounds” • With your table partners: Use the element model kit at your table to build all components that are present in our air. Everyone at your table must contribute at least one compound or molecule to the group. Use the key below as a guide: Blue = NitrogenWhite = Hydrogen Red = OxygenSIlver= Argon Black = Carbon • Make sure all compounds that your build are stable or “happy” with their desired amount of valence electrons. If they are not stable, fix them! (They should all be stable compounds) Plan of the Day • To-Do List • BrainiacsVideo • Building Compounds • Notes: Bonding • Ionic vs. Covalent To Do- Part 2: Write down each of the following compounds in your new journal entry. Count the total number of atoms in each compound (Ex. H2O: H=2 O=1 Total=3) Ethanol: C2H6O Caffeine: C8H10N4O2 Acetone: CH3COCH3 Anthrax: (C6H4CH)2

  3. “Building Compounds” Think, Pair, Share: What lessons can you learn from the “Stick Together” activity about valence electrons and bonding. (Stable vs. Unstable, Share vs. Give, Sharing Multiple Sticks, Etc.) Draw all components of air in each of the boxes below: What do all of the compounds in air have in common in regards to how they bond?

  4. Octet Rule • Elemental atoms generally transfer or share valence electrons with other atoms in order to achieve a full set of 8 electrons in the outer shell. • When they share or transfer electrons this creates BONDS- elements that connect together to form compounds

  5. Stable vs. Unstable Molecules • If an element or compound has a full set of electrons in its outer shell then it’s stable, happy, and non-reactive. • However, if an element or compound has less than a full outer shell, then it’s unstable, sad, and reactive. • The more empty the outer shell, the more unstable it is! • Brainiacs Video: Alkali Metals

  6. Two Types of Bonding • Ionic Bond- Transfer of electrons forming positive and negative ions that are attracted to one another • Weaker Bond • Metal + Non Metal = Ionic • Ex. Na + ClNaCl (salt) • Covalent Bond- Sharing of electrons to form new compounds • Stronger Bond • Non Metal + Non Metal • Ex. H + ClHCl (hydrochloric acid)

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