1 Copyright 2017 by Thomas Edison State University All rights reserved

1 copyright 2017 by thomas edison state university

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1 Copyright © 2017 by Thomas Edison State University . All rights reserved.
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(Reference: Chang 9.23) 4. Compare the properties of ionic compounds and covalent compounds. (6 points) Ionic compounds are formed by metals releasing an electron to non-metals making the ion have a negative charge but holds onto the non-metal. Covalent bond have two non- metals that share their electrons instead of taking it, almost like having a mutual agreement while ionic bonds lose/gain. (Reference: Chang 9.32) 5. Four atoms are arbitrarily labeled D, E, F, and G. Their electronegativities are as follows: D = 3.8, E = 3.3, F = 2.8, and G = 1.3. If the atoms of these elements form the molecules DE, DG, EG, and DF, how would you arrange these molecules in order of increasing covalent bond character? (4 points) DE= 3.8-3.3= .05 DG=3.8-1.3= 2.5 EG=3.3-1.3= 2.0 DF= 3.8-2.8= 1.0 DG < EG < DF < DE (Reference: Chang 9.37) 6. Classify the following bonds as ionic, polar covalent, or nonpolar covalent, and give your reasons: (4 points) a. the CC bond in H 3 CCH 3 - Nonpolar Covalent Bond since the electrons are shared equally b. the KI bond in KI - Ionic Bond since K loses an electron and I gains an electron c. the NB bond in H 3 NBCl 3 - Polar Covalent Bond sine there isn’t any sharing, the nitrogen electrons take the space in the empty space of B d. the CF bond in CF 4 - Polar Covalent Bond since F is more negative ten carbon causing a polarity effect. They will end up sharing the electron. (Reference: Chang 9.39) 7. Write the correct Lewis structures for the following compounds (relative positions of atoms are shown correctly). (21 points) See Attached Document (I had to draw Them Out) 2 Copyright © 2017 by Thomas Edison State University . All rights reserved.
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a. H C ≡ N ̶ b. H C ≡ C H ̶ ̶ c. O = Sn = O d. F F \ / B | F e. H O F ̶ ̶ f. H \ C F ̶ // O g. F F \ / N | : F: (Reference: Chang 9.47) 8. Classify the following substances as ionic compounds or covalent compounds containing discrete molecules: CH 4 , KF, CO, SiCl 4 , BaCl 2 . (5 points) BaC l 2 Covalent SiC l 4 Covalent CO Ionic KF
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