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Unformatted text preview: CH301 Fall 2010Worksheet 4 Answer Key 1. For each element below, indicate the ion(s) it is most likely to form. a) Na Na + b) Ca Ca 2+ c) Ir Ir + , Ir 3+ d) Pb Pb 2+ , Pb 4+ e) Cl Cl- f) S S 2- 2. Write balanced unit formulas for the salts formed by the following pairs of ions. a) Mg 2+ , I- MgI 2 b) Fe 3+ , CO 3 2- Fe 2 (CO 3 ) 3 c) Al 3+ , N 3- AlN 3. Write balanced unit formulas for the most likely salts formed by the following pairs of elements. a) Ca, O CaO b) Al, F AlF 3 c) K, S K 2 S 4. What is the electronegativity of each of the following elements? (Note: if you have to look these up, make sure you memmorize them before quiz 2 and certainly before exam 1.) H 2.2 B 2.0 O 3.5 Li 1.0 F 4.0 C 2.5 Be 1.5 N 3.0 5. What is lattice energy and what is it proportional to? (Hint: think Coulombs law) Lattice energy refers to the amount of energy required to disrupt the crystal lattice of a salt. Since salts arent discrete units in the way that molecules are they form tessellating crystals; since they have full charges and are separated...
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