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UNC-Chapel Hill CHEM 251 - Problem Session 4

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CHEM 251 1st Edition Lecture 15 Outline of Last Lecture I. Clicker QuestionII. Ionic LatticesIII. Packing StructureIV. Application-Photovoltaic ElectricityOutline of Current Lecture V. Clicker QuestionsVI. Group ProblemsCurrent LectureVII. Clicker Questionsa. Which do you expect to be more polarizable? Fluoride anion vs. Iodide anioni. Iodide anion- b/c outer electrons in fluoride more tightly bound because F- is smaller and more electronegativeb. Which has smaller radius? Se2- vs. Br-i. Br- is smaller b/c it has an extra proton so outer electrons are pulled in closer (higher effective nuclear charge)c. Most ionic bonding character? Na2S, NaF, MgSi. NaF- Has largest electronegativity difference VIII. Group Questionsa. Predict bonding character of K3As; EN (K): 0.8, EN (As): 2.0These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.i.ii. Metallic (average EN = 1.4, difference in EN = 1.2)b. Predict formula of nickel (II) sulfate hydratei.


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UNC-Chapel Hill CHEM 251 - Problem Session 4

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