1. Which molecule contains a nonpolar covalent bond?
1) 2) 3) 4)
2. Which electron dot formula represents a polar molecule?
1) 2) 3) 4)
3. Which molecule contains a polar covalent bond?
1) 2) 3)
4. Which structural formula represents a polar molecule?
1) 2) 3)
4)
4)
5. Which electron-dot diagram represents a molecule that has a polar covalent bond?
1) 2) 3) 4)
6. Which electron dot formula represents a polar molecule?
1) 2) 3) 4)
7. Which electron-dot structure represents a non-polar molecule?
1) 2) 3) 4)
8. Which type of molecule is CF
4
?
1) polar, with a symmetrical distribution of charge
2) polar, with an asymmetrical distribution of charge
3) nonpolar, with a symmetrical distribution of charge
4) nonpolar, with an asymmetrical distribution of charge
9. The atoms in a molecule of hydrogen chloride are held together by
1) hydrogen bonds
2) ionic bonds
3) polar covalent bonds
4) non-polar covalent bonds

10. Which type of bond is present in a water molecule?
1) polar covalent
2) nonpolar covalent
3) ionic
4) electrovalent
11. Which type of bond is formed between the carbon and oxygen atoms in a CO
2
molecule?
1) nonpolar covalent
2) polar covalent
12. Which formula represents a polar molecule?
3) ionic
4) electrovalent
1) H
2
2) H
2
O 3) CO
2
13. Which formula represents a nonpolar molecule?
4) CCl
4
1) HCl 2) H
2
O 3) NH
3
4) CH
4
14. Why is a molecule of CO
2
nonpolar even though the bonds between the carbon atom and the oxygen atoms are polar?
1) The shape of the CO
2
molecule is symmetrical.
2) The shape of the CO
2
molecule is asymmetrical.
3) The CO
2
molecule has a deficiency of electrons.
4) The CO
2
molecule has an excess of electrons.
15. Which formulas represent two polar molecules?
1) CO
2
and HCl 2) CO
2
and CH
4
3) H
2
O and HCl 4) H
2
O and CH
4
16. The bonds between hydrogen and oxygen in a water molecule are classified as
1) polar covalent
2) nonpolar covalent
3) ionic
4) metallic
17. Which substance is correctly paired with its type of bonding?
1) NaBr–nonpolar covalent
2) HCl–nonpolar covalent
18. Which molecule is nonpolar?
1) H
2
O 2) NH
3
3) CO
19. The diagram below represents a water molecule.
3) NH
3
–polar covalent
4) Br
2
–polar covalent
4) CO
2
This molecule is best described as
1) polar with polar covalent bonds
2) polar with nonpolar covalent bonds
3) nonpolar with polar covalent bonds
4) nonpolar with nonpolar covalent bonds
20. Which formula represents a nonpolar molecule containing polar covalent bonds?
1) H
2
O 2) CCl
4
3) NH
3
4) H
2

2
4
1
2
3
3
3
2
3
1
1
2
3
4
1
2
1
3
1
3
10.
11.
12.
13.
8.
9.
6.
7.
1.
4.
5.
2.
3.
18.
19.
20.
14.
15.
16.
17.