Online Introductory Chemistry
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Molecular Compounds
| Answers to formative pretest true false questions for Lesson 5 Molecular Compounds. These questions are a quick overview of the topics in this lesson. You are not expected to know this material before hand. The questions are intended to help you focus on material in the lesson. After you have studied the lesson you should be able to answer these and even more complicated questions. |
| 1. T |
The covalent bond exists between atoms that share electrons. |
| 2. F |
The atoms in a molecule have no repulsions between atomic nuclei. |
| 3. T |
The distance between atoms in a molecule is called the bond length.. |
| 4. T |
Hydrogen normally forms one bond. |
| 5. F |
The bond length or distance is the same for all covalent bonds. |
| 6. F |
A single covalent bond exists when two atoms share an electron. |
| 7. F |
A triple bond is weaker than a single bond. |
| 8. T |
Nitrogen can form single, double and triple covalent bonds. |
| 9. T |
The C-O bond is more polar than the C-F bond. |
| 10. F |
The group number for a nonmetal element indicates the number of bonds it can form. |
| 11. F |
The valence electrons on an atom in a molecule are tied to the original atom. |
| 12. T |
Lewis structures show atom symbols and valence electrons. |
| 13. F |
The tetrahedron is the basic shape for molecules like CH2CH2, ethylene. |
| 14. F |
Water molecules have a linear or straight shape with angles of 180 degrees. |
| 15. F |
The least electronegative element is fluorine. |
| 16. F |
Polar bonds exist between atoms that share electrons equally. |
| 17. F |
The number four is indicated by the prefix "penta-". |
| 18. T |
The electron configuration for the six electrons in carbon is 1s22s22p2 |
| 19. F |
The bond angles in methane CH4 are ninety degrees. |
| 20. F |
Carbon monoxide is a polar molecule with the oxygen end being slightly positive. |
