Name: ________________________ Class: ___________________ Date: __________
ID: A
Chapter 8 Test Matching Match each item with the correct statement ...
Chapter 8 Test Matching Match each item with the correct statement below. a. hydrogen bond d. single covalent bond b. double covalent bond e. polar bond c. structural formula ____ ____ ____ ____ ____
1. 2. 3. 4. 5.
a depiction of the arrangement of atoms in molecules and polyatomic ions a covalent bond in which only one pair of electrons is shared a covalent bond in which two pairs of electrons are shared a covalent bond between two atoms of significantly different electronegativities a type of bond that is very important in determining the properties of water and of important biological molecules such as proteins and DNA Match each item with the correct statement below. a. polar molecule d. sigma bond b. VSEPR theory e. diatomic molecule c. dipole interaction
____ 6. ____ 7. ____ 8. ____ 9. ____ 10.
a molecule in which one end is slightly negative and the other end is slightly positive symmetrical bond along the axis between the two nuclei a molecule made up only two atoms attraction between polar molecules because electron pairs repel, molecules adjust their shapes so that the valence-electron pairs are as far apart as possible.
Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 11. Which is a typical characteristic of an ionic compound? a. Electron pairs are shared among atoms. b. The ionic compound has a low solubility in water. c. The ionic compound is described as a molecule. d. The ionic compound has a high melting point. ____ 12. What is shown by the structural formula of a molecule or polyatomic ion? a. the arrangement of bonded atoms c. the number of metallic bonds b. the number of ionic bonds d. the shapes of molecular orbitals ____ 13. Which of these elements does not exist as a diatomic molecule? a. Ne c. H b. F d. I
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Name: ________________________
ID: A
____ 14. How do atoms achieve noble-gas electron configurations in single covalent bonds? a. One atom completely loses two electrons to the other atom in the bond. b. Two atoms share two pairs of electrons. c. Two atoms share two electrons. d. Two atoms share one electron. ____ 15. Which noble gas has the same electron configuration as the oxygen in a water molecule? a. helium c. argon b. neon d. xenon ____ 16. Which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules? a. unvalenced pair c. inner pair b. outer pair d. unshared pair ____ 17. Which of the following diatomic molecules is joined by a double covalent bond? c. N 2 a. O 2 b.
d.
He 2
____ 18. A molecule with a single covalent bond is ____. c. a. CO 2
CO
b.
Cl2
Cl 2
d.
N2
____ 19. A bond that is not symmetrical along the axis between two atomic nuclei is a(n) ____. a. alpha bond c. pi bond b. sigma bond d. beta bond ____ 20. According to VSEPR theory, molecules adjust their shapes to keep which of the following as far apart as possible? a. pairs of valence electrons c. mobile electrons b. inner shell electrons d. the electrons closest to the nuclei ____ 21. A bond formed between a silicon atom and an oxygen atom is likely to be ____. a. ionic c. polar covalent b. coordinate covalent d. nonpolar covalent ____ 22. When placed between oppositely charged metal plates, the region of a water molecule attracted to the negative plate is the ____. a. hydrogen region of the molecule c. H—O—H plane of the molecule b. geometric center of the molecule d. oxygen region of the molecule ____ 23. What is thought to cause the dispersion forces? a. attraction between ions c. sharing of electron pairs b. motion of electrons d. differences in electronegativity ____ 24. What causes dipole interactions? a. sharing of electron pairs b. attraction between polar molecules c. bonding of a covalently bonded hydrogen to an unshared electron pair d. attraction between ions ____ 25. What causes hydrogen bonding? a. attraction between ions b. motion of electrons c. sharing of electron pairs d. bonding of a covalently bonded hydrogen atom with an unshared electron pair 2
Name: ________________________
ID: A
Types of Bonds (15 pts: 3pts each) Use the proper tables to answer the following question. 26. Determine the types of bonds between the following pairs of atoms. a. H and O
b. F and Mg
c. Br and N
d. Polonium and Arsenic
e. Germanium and Bismuth
. True/False (2pts each) Indicate whether the statement is true or false. ____ 27. In a polar bond, the atoms are sharing electrons equally. ____ 28. There are only single covalent bonds in a molecule of water. ____ 29. In a molecule of hydrogen chloride, the chlorine has a slightly positive charge. ____ 30. The shape of a water molecule is linear. ____ 31. A molecule is a neutral group of covalently bonded atoms.
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Name: ________________________
ID: A
Lewis Structures (5pts each: 3pt for Lewis Structure, 2pts for Shape) 32. Draw the Lewis structure and then determine the shape of the following molecules: a. CH4 Lewis Structure
Shape: ___________________________
Lewis Structure
Shape: ___________________________
c. HCN Lewis Structure
Shape: ___________________________
b. PF3
d. SO3 Lewis Structure
Shape: ___________________________
.
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Name: ________________________
ID: A
Essay (10pts: 1pt spelling/grammar, 1pt for having at least 3 sentences, 8pts for correct answer) 33. Distinguish between ionic and covalent bonds in terms of how each is formed and how to predict which will be formed when various elements combine.
.
Bonus Lewis Structure (5pts) 34. Draw the Lewis structure for the silicate ion, SiO 32-.
