HW3 - momin(rrm497 Homework 3 Sutclie(53120 This print-out...

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momin (rrm497) – Homework 3 – Sutcliffe – (53120) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This assignment covers naming (Ch2), moles and percent composition (Ch3), and Chapter 13 up to (but not including) VSEPR theory. There will be one more Homework be- fore Exam 2 which will cover VSEPR and VB theory, MO theory, empirical analysis (Ch 3) and simple stoichiometry (some of Ch 4). 001 10.0 points Choose the pair of names and formulae that do not match. 1. SiCl 4 : silicon tetrachloride 2. N 2 O 3 : dinitrogen trioxide 3. SnCl 4 : tin(V) chloride correct 4. MgSO 4 : magnesium sulfate 5. KNO 3 : potassium nitrate Explanation: 002 10.0 points A metal (call it X) in Group IIIA of the peri- odic table forms a compound with an element (call it Y) in Group VIA. The compound will most likely have the formula 1. X 3 Y 2 2. XY 3. X 2 Y 3 correct 4. X 3 Y 6 5. X 3 Y 3 Explanation: Group IIIA elements form ions with +3 charge. Group VIA elements for ions with - 2 charge. Therefore to form a neutral com- pound there must be 2 X atoms for every 3 Y atoms. 003 10.0 points The electronegativity of an atom generally ? going up columns and ? going right to left across rows. An element like calcium would most likely form a(n) ? bond with an element like nitrogen. 1. increases; increases; covalent 2. decreases; decreases; ionic 3. decreases; decreases; covalent 4. decreases; increases; covalent 5. increases; decreases; ionic correct 6. decreases; increases; ionic 7. increases; decreases; covalent 8. increases; increases; ionic Explanation: If the difference in electronegativities be- tween two bonded atoms is small, the atoms tend to form a covalent bond. 004 10.0 points What is the ground-state electron configura- tion for Cu 2+ ? 1. [Kr] 2. [Xe] 4 f 14 5 d 10 6 s 2 3. [Ar] 3 d 8 4. [Xe] 4 f 14 5 d 4 5. [Ar] 3 d 10 4 s 2 6. [Ar] 3 d 9 correct 7. [Kr] 4 d 10 8. [Ar] 9. [Xe]
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momin (rrm497) – Homework 3 – Sutcliffe – (53120) 2 10. [Kr] 4 d 10 5 s 2 Explanation: Copper (and the other jewelry metals in IB) is an exception. The 4 s electron and one 3 d electron are released to form the Cu 2+ ion. 005 10.0 points Which pair of atoms (ions) is listed in order of INCREASING radii? 1. Mg 2+ , Na + correct 2. Br - , Cl - 3. Mg, Mg 2+ 4. S 2 - , Cl - Explanation: Ionic radii become larger as you move down a column or as you move from right to left across a row. 006 10.0 points Which of the following would have the highest melting point? 1. KI 2. RbF 3. KBr 4. KF correct 5. KCl Explanation: KF has the highest charge density.
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