Exam02answers pg4 - 4. nuclear. 5. metallic. Explanation:...

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Unformatted text preview: 4. nuclear. 5. metallic. Explanation: 014 (part 1 of 1) 10 points Which of the following is the best representation of the compound magnesium nitride? Explanation: The formal charge is calculated by FC = group # −(# bonds + # unshared e− ) Thus FC1 FC2 FC3 FC4 = 5 − (4 + 0) = 1 = 6 − (1 + 6) = −1 = 6 − (2 + 4) = 0 = 6 − (2 + 4) = 0 N ¤¤ ¥¥ £ 4. None is appropriate because magnesium nitride is a covalent compound.  N  Explanation: 6. E(SO4 )2 015 (part 1 of 1) 10 points For the electron dot representation ·· · ··O·· O· 3 ·· 1 ·· N O N ·· 4 · ·O · ·· ··O·· 2 · of N2 O5 , what are the formal charges on each atom going from 1 to 4 in order? 1. 1, −1, 0, 0 correct 2. 0, 1, 0, 0 3. −1, 1, 0, −1 4. −1, 2, 1, 0 5. 0, 1, 0, −1 6. 0, 0, 0, 0 018 (part 1 of 1) 10 points If the following crystallize in the same type Explanation: 017 (part 1 of 1) 10 points Which of the following would have the highest melting point? 1. RbF 2. KI 3. KCl 4. KF correct 5. KBr Explanation: KF has the highest charge density.  N !!  6. 2 Mg , +  ¢   5. Mg+ ,  , N    ¢  3. Mg 2+ ©©  ¢ ¨ ¨ 2. Mg2+ , 2 N 2− − 2− ¦ §¦ £ 1. 3 Mg 2+ 3− ,2 ¡¢¡ correct − 016 (part 1 of 1) 10 points An element E has the electronic configuration [Ne] 3s2 3p1 . Write the formula of its compound with sulfate. 1. E2 (SO4 ) 2. E3 (SO4 ) 3. E3 (SO4 )2 4. E2 (SO4 )3 correct 5. E(SO4 )3 ...
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