Page 205 - Teacher Preview Copy

.
Topic 4: Chemical bonding

18. Molecular substances, shapes and polarity: Recalling concept facts and definitions
1. Which term refers to the smallest unit of a covalent substance?
1) Allotrope 2) Molecule 3) Isomer 4) Isotope

2. When two atoms form a chemical bond by sharing electrons, the resulting molecule will be
1) Polar, only 3) Either polar or nonpolar
2) Nonpolar, only 4) Neither polar nor nonpolar

3. Two nonmetal atoms of the same element share electrons equally. The resulting molecule is
1) Polar, only 3) Either polar or nonpolar
Teacher Preview Copy
Teacher Preview Copy
4) Neither polar nor nonpolar
2) Nonpolar, only

4. Symmetrical distribution of charge in a molecule resulted in the molecule being
1) Ionic 3) Network solid
2) Polar 4) Nonpolar

5. Asymmetrical distribution of charge in a molecule usually resulted in the molecule being
1) Polar 3) Nonpolar
2) Metallic 4) Ionic

6. Bonding in all diatomic molecules is
1) Polar, and the molecule is always polar
2) Nonpolar, and the molecule is always polar
3) Polar, and the molecule is always nonpolar
4) Nonpolar, and the molecule is always nonpolar

7. The bonding in nonpolar molecules usually resulted in the molecule having
1) Asymmetrical shape with equal charge distribution
2) Asymmetrical shape with unequal charge distribution
3) Symmetrical shape with equal charge distribution
4) Symmetrical shape with unequal charge distribution

8. Which best describes the shape and charge distribution in polar molecules?
1) Asymmetrical shape with equal charge distribution
2) Asymmetrical shape with unequal charge distribution
3) Symmetrical shape with equal charge distribution
4) Symmetrical shape with unequal charge distribution

Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 195