2 Ch 8 Review1. The following molecules contain polar bonds. The only nonpolar molecule is: HCl, H2O, CO2, NH32. A polar molecule contains ______________.3. What is the Lewis structure of HCl?4. The following molecules contain polar bonds. The only polar molecule is: CCl4, CO2, NH3, CH45. Atoms are __________ when they are combined.6. In a molecule of fluorine, the two shared electrons give each fluorine atom _____ electrons in their outer energy level.
3 7. In which of the following is NOT a nonpolar covalent bond 7. In which of the following is NOT a nonpolar covalent bond? HCl, O2, Cl2, H28. In metals, the valence electrons ________________________.9. In drawing Lewis structure, the central atom is the ______________________________.10. In drawing a Lewis structure, each nonmetal atom except H should be surrounded by _____ electrons.11. What is the correct Lewis structure for CCl4 ?12. As independent particles, atoms are ______.
4 13. VSEPR theory is a model for predicting_________________. 14. If the atoms that share electrons have an unequal attraction for the electrons the bond is called _______________.15. The chemical formula for water is H2O. What type of formula is that?16. The mixing of two or more atomic orbitals of similar energies on the same atom to produce new orbitals of equal energies is called ________.17. The shiny appearance of metals is due to ________________.
5 18. The elements of the ______ group satisfy the octet rule without forming compounds. 19. According to VSEPR theory what is the shape of ammonia, NH3 ?20. Use VSEPR theory to predict the shape of HCl?21.The electrons involved in the formation of a chemical bond are called __________________.22. In the crystal lattice of an ionic compound, each cation is surrounded by _______________.23. Malleability and ductility are properties of ________ bonds.
6 24. Shifting layers in an ionic compound causes it to ___________________. 25. A chemical bond results from the mutual attraction of the nuclei of atoms and _________.26. A covalent bond results when ________ are shared.27. The B-F bond in BF3 (electronegativity for B is 2.0 and F is 4.0) is _________________.28. A neutral group of atoms held together by covalent bonds is a __________________.29. Which of the following is NOT an example of a molecular formula? B, O2, Cl2, H2, H2O30. How many double bonds are in the Lewis structure for HF, hydrogen fluoride?
7 31. How many extra electrons are in the Lewis structure of the sulfate ion, SO42- ? 32. A chemical bond that results from the electrostatic attraction between cations and anions is called a(n)____________________.33. An octet is equal to ______ electrons.