Chemistry- Chapter 4

15. Write the chemical formula for calcium chloride

CaCl2

10. Write the chemical formula for chromium (III) sulfide

Cr2S3

4. Provide the correct IUPAC name for Fe(OH)3.

Iron (III) hydroxide

12. Write the chemical formula for selenium hexafluoride.

SeF6

6. Determine the number of valence electrons in hypochlorite (ClO-) and then draw the corresponding Lewis structure. Please place the atoms in the order that they were written. a. 14 b. 11 c. 10 d. 18 e. 13

a. 14

13. Draw the Lewis structure of BH3 and then determine if the molecule is polar or nonpolar a. nonpolar b. polar

a. nonpolar

9. Determine the number of valence electrons in CH2Cl2, dichloromethane, and then draw the corresponding Lewis structure. a. 23 b. 20 c. 16 d. 22 e. 24

b. 20

5. Draw the Lewis structure of hydronium (H30+) and then determine its electron domain and molecular geometries. a. tetrahedral/ planer b. tetrahedral/ trigonal pyramidal c. planer/ planer d. trigonal planer/ linear e. linear/ linear

b. tetrahedra;/ trigonal pyramidal

8. Which of the following bonds is a polar covalent bond? a. Li-Cl b. Cl-Cl c. H-Cl d. Li-Li

c. H-Cl

7. Which of the following bonds is the most polar based on electronegativity differences? a. P-S b. C-Cl c. F-F d. Rb-I e. all bonds have equal polarity

d. Rb-I

11. Provide the correct IUPAC name for N2O4.

dinitrogen tetroxide

3. The overall charge is -1 for the Lewis structure shown below. Choose the possible identity or identities of the central atom. (image) a. F b. N, P, or As c. C, Si, or Ge d. B or Al e. Cl, Br, or I

e. Cl, Br, or I