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Thursday 3-20-14

Thursday 3-20-14. WU: 1. Draw an e-dot for the compound sodium nitride (Na bonded to N) 2. Today is the vernal equinox. a. Label the season for each of the Northern hemispheres in the picture. b. Explain how you know which one is the vernal equinox. 1. 4. 2.

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Thursday 3-20-14

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  1. Thursday 3-20-14 • WU: 1. Draw an e-dot for the compound sodium nitride (Na bonded to N) 2. Today is the vernal equinox. a. Label the season for each of the Northern hemispheres in the picture. b. Explain how you know which one is the vernal equinox. 1 4 2 3

  2. Summer = tilted towards sun Winter= tilted away from sun Fall = from summer to winter 2. Today is the vernal equinox. a. Label the season for each of the Northern hemispheres in the picture. b. Explain how you know which one is the vernal equinox. Spring = from winter to summer 1 4 2 3

  3. Thursday 3-20-14 • WU: 1. Draw an e-dot for the compound sodium nitride (Na bonded to N)

  4. To Do: • Grade Ions in Compounds Activity • Update SN • Writing Formula Notes • HW: Chemical Bonding Analysis

  5. Writing Chemical Formulas Chemical formulas describe compounds and list the types & numbers of atoms that are present in the compound. Consider the most famous chemical formula… H2O The small 2 is a subscript. It tells us that there are two hydrogen atoms in every molecule of water. A subscript number always belongs to the atom on the left and can NEVER be changed in a chemical formula.

  6. H H O Compounds form so that each atom has a full outer energy level Sometimes that means it requires more than 1 atom to bond with another atom H2O Take water for example Water requires 2 hydrogen's for each oxygen

  7. Given valence electrons figure out charge for each family +1 0 +2 +/-4 -3 -2 -1 +3

  8. Always write metal first followed by nonmetal Compounds always have a neutral charge Sometimes that means you only need one metal and one nonmetal Na+ + Cl- NaCl Sometimes you need more than one metal &/or nonmetal Ca+2 + Cl- + Cl-  CaCl2

  9. Find the number of atoms of Magnesium and Iodine needed to make Magnesium iodide. Mg+2 + I- + I-  MgI2 Find the formula for potassium nitride K+ + N-3 + K+ + K+ +  K3N

  10. Cl Ca Cl Criss Cross Method to find subscripts If the charges do not already add up to zero, the charge # of the metal becomes the subscript for the nonmetal, and vice versa For example: Calcium has a charge of 2, chlorine is a charge of 1 so the formula is CaCl2 = CaCl2 Ca+2 Cl-1 1 2 Ca+2 + Cl-1 + Cl-1 CaCl2 Of Course 1 atom is assumed and you don’t need that subscript

  11. Find the formula for magnesium phosphide Mg+2 P-3 Mg+2 P-3 = Mg3P2 3 2 Mg+2 + Mg+2 + Mg+2 + P-3 + P-3 Mg3P2

  12. To Do: • Update SN • Chemical Bonding Analysis

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