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Topic 4: Chemical bonding

21. Degree of bond and molecular polarity: Determining formula with most and least polarity

1. The degree of bond and molecular polarity of a compound can be predicted by determining the

difference in
1) Melting points of the elements in the compound
2) Densities of the elements in the compound
3) Electronegativity values of the elements in the compound
4) Atomic masses of the elements in the of the compound

2. Which of these formulas contain a bond with the most ionic characteristics?
1) NaCl 2) MgCl2 3) KCl 4) CaCl2

3. Which bond is the least ionic? 2) Li – O 3) N – O 4) S – O
Teacher Preview Copy
1) Al – O

4. The bonding in which compound has the least degree of ionic character?
1) KBr 2) HF 3) MgO 4) PCl3

5. Which bond has the greatest degree of covalent characteristics?

1) C – O 2) H – O 3) F – O 4) N – O
6. The bonding in which molecule has the greatest degree of covalent characteristics?
1) CF4 2) BeF2 3) BF3 4) LiF

7. A bond between which two atoms has the least covalent characteristics?
2) NO2

3) SO2
1) CaO Teacher Preview Copy 4) H2

8. Which pair of atoms forms a bond that is the least covalent?
1) Ba and I 2) Br and Cl 3) K and Cl 4) Li and I

9. Which molecule is the most polar?
1) H – Br 2) H – Cl 3) H – F 4) H – I

10. Which molecule is the most polar? 2) CCl4 3) CH4 4) CO2
1) NH3

11. Which molecule is the least polar? 2) HCl 3) HBr 4) H2

1) H2O

12. In which substance are the molecule the most polar?
1) H2Te 2) H2Se 3) H2S 4) H2O

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