Unit 6 Review Worksheet Answers

1. less

2. ionic - transfer of e-; covalent - share e-

3.  > 1.7 = ionic; < 1.7 = covalent
0 – 0.3 = nonpolar covalent; 0.3 – 1.7 = polar covalent

4.  metal & nonmetal

5. polar covalent - 2 different nonmetals; nonpolar covalent - 2 of the same nonmetal

6.  Put them on central atom.

7.  double bond

8.  first element written is central atom

9.  - no unshared e- pairs on central atom
      - surrounding atoms must be same element

10.  A = central atom; B = surrounding atoms; E = unshared e- pairs on central atom

11. There are 2 surrounding atoms

12.  AB₂E & AB₂E₂

13.  AB & AB₂

14.  AB₄

15.  AB₃

16.  AB₃E

17.  ionic - formula unit; covalent - molecule

18.  molecular

19.  ionic

20.  ionic

21.  molecular

22.  hydrogen bonding à dipole-dipole forces à dipole-induced dipole forces à London
dispersion forces

23.  hydrogen bonding - b/n molecules of NH₃, H₂O, & HF
      dipole-dipole forces - b/n polar molecules
      dipole- induced dipole forces - polar & nonpolar molecules
      London dispersion - nonpolar molecules & noble gases

24.   (D) < (E) < (C) < (A) < (B)

25.    (A)   AB₄, tetrahedral, nonpolar, London dispersion

          (B) AB₂E₂, bent, polar, dipole-dipole & London

          (C)    
AB₃E, trigonal pyramid, polar, hydrogen bonding,
                   dipole-dipole, London

          (D)   
AB₃, trigonal planar, nonpolar, London

          (E)    AB₂, linear, nonpolar, London

          (F)     AB₂E, bent, polar, dipole-dipole, London

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