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Counting Atoms

Counting Atoms. Subscripts tell how many atoms of each element are present If formula has parenthesis or number in front , use the distributive property (like in math class) MgCl 2 H 2 O C 6 H 12 O 6. 2H 2 SO 4 Ba(NO 3 ) 2 Mg(C 2 H 3 O 2 ) 2 4NaCO 3. (NH 4 ) 2 O 2Fe(NO 3 ) 2

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Counting Atoms

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  1. Counting Atoms • Subscripts tell how many atoms of each element are present • If formula has parenthesis or number in front, use the distributive property (like in math class) MgCl2 H2O C6H12O6

  2. 2H2SO4 Ba(NO3)2 Mg(C2H3O2)2 4NaCO3 (NH4)2O 2Fe(NO3)2 3Be(CN)2 Counting Atoms Practice I

  3. Lattice Energy • Energy associated with strength of bond • More negative the number, the stronger the bond • Stronger bonds have • Smaller atoms • Higher charges

  4. Strong bonds have Smaller atoms & Higher charges NaCl or NaBr BeO or BN Sr3P2 or RbI Al2S3 or B2O3 MgO or Al2O3 Lattice Energy • Li2O or LiBr • KBr or KF • NaCl or MgO • Li3N or LiCl • CaS or Al2S3

  5. Formula Practice I • Aluminum + Oxygen • Sodium + Sulfate • Lithium + Calcium • Calcium + Sulfur • Barium + Chlorine

  6. Formula Practice I • Magnesium + Phosphorus • Lithium + Sulfite • Boron + Oxygen • Carbon + Oxygen • Calcium + Nitrate

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