1. Polarity & EN Quiz Review

2. 1. Determine whether the bond formed between each of the elements listed below would be ionic or covalent based on the metallic/nonmetallic nature of the elements involved.

3. 1. Determine whether the bond formed between each of the elements listed below would be ionic or covalent based on the metallic/nonmetallic nature of the elements involved.
(a) Li - O ionic (b) N - F covalent
(c) Se - Cl covalent (d) B - H covalent
(e) Cr - I ionic (f) K - Cl ionic

4. 2. Use the electronegativities table in your notebook to determine whether the bonds listed below are ionic, polar covalent or nonpolar covalent. .

5. 2. Use the electronegativities table in your notebook to determine whether the bonds listed below are ionic, polar covalent or nonpolar covalent.
(a) Li - O (ionic) (b) N - F (polar covalent)
(c) Se - Cl (polar covalent) (d) B - H 0.19 (nonpolar covalent)
(e) Cr - I (polar covalent) (f) K - Cl 1.92 (ionic)

6. 3. Which bond in question 2 is the strongest?

7. 3. Which bond in question 2 is the strongest?
Li - O

8. 4. List three properties of metals.

9. 4. List three properties of metals.
high melting points (solids)
hard
conductors
shiny
malleable
lose electrons

10. 5. Why do covalent bonds form between elements with similar electronegativities?

11. 5. Why do covalent bonds form between elements with similar electronegativities?
Elements with similar electronegativities have to share electrons because neither atom has enough pull on the electrons (electronegativity) to capture the electrons from the other atom.

12. 6. State a difference and a similarity between polar covalent and nonpolar covalent bonds.

13. 6. State a difference and a similarity between polar covalent and nonpolar covalent bonds.
Polar covalent bonds involve different nonmetal atoms whereas nonpolar covalent bonds involve the same nonmetal atoms. Electrons are shared in both bonds (equal sharing in nonpolar covalent and unequal sharing in polar covalent).