1. T/F: Nonmetal Atoms Combine by Sharing Electrons Because Anions Attract Each Other?

Review questions for unit 3 test, scantron: You may use only your periodic table during both the scantron and the open ended parts of this test!

The 15 actual m. choice questions are similar to the questions listed here, and all multiple choice. Molecules are NOT identical to the ones used below; but, they are similar!

1. T/F: Nonmetal atoms combine by sharing electrons because anions attract each other?

2. T/F: Nonmetal atoms combine by sharing electrons because atoms are more stable with an octet of electrons.

3. T/F: The Cl2 molecule has all single bonds.

4. T/F: The CO molecule has all single bonds.

5. T/F: The O2 molecule has all single bonds.

6. T/F: The O2 molecule has 1 double bond.

7. T/F: The N2 molecule has all single bonds.

8. T/F: The N2 molecule has 1 triple bond.

9. T/F: The CO molecule has 1 triple bond.

10. T/F: The central atom in the molecule, CO2, does not follow the octet rule.

11. T/F: The central atom in the molecule, H2S, does not follow the octet rule.

12. T/F: The central atom in the molecule, PCl3, does not follow the octet rule.

13. T/F: The central atom in the molecule, SF6, does not follow the octet rule.

14. Accordint to VSEPR theory, molecules adjust their shapes to keep _____ as far apart as possible. A. protons. B. neutrons and protons C. valence electron pairs D. cations and anions

15. The shape of CO is called: A. linear B. bent C. trigonal planar D. pyramidal E. tetrahedral

16. The shape of CF4 is called: A. linear B. bent C. trigonal planar D. pyramidal E. tetrahedral

17. T/F: In a “resonance structure”, the measured bond length and strength are somewhere midway between what is expected.

18. T/F: In a “resonance structure”, the molecule is unusually stable.

19. T/F: More than one dot structure may be drawn for a resonance structure.

20. By which atom(s) should you draw the partial negative symbol in the molecule, H2O?

A. H B. O C. both H and O D. Neither H nor O

21. Which is the least electronegative atom of the atoms listed: A = H B = I C = O D = S

22. When a water molecule is placed between 2 charged plates, the molecules rotate so that: A. the positive part of the water molecule faces the positive plate

B. the nucleus of the water atoms face the positive plate

C. the negative part of the water molecule faces the positive plate

D. water molecule’s don’t rotate in response to an electric field

23. One of which 3 atoms must be covalent bonded to an H in order for Hydrogen Bonding to occur? a. O, S, F b. F, O, N c. F, C, Cl d. N, O, S

24. Binary molecules are made up of:

A. 2 nonmetal elements B. 2 metal elements C. 1 nonmetal and 1 metal D. 1 nonmetal and 1 metalloid.

25. T/F: A molecule with a “coordinate covalent bond” is one in which extra electrons should be added or taken away from the dot structure.

26. T/F: A “coordinate covalent bond” is a bond in which one of the 2 atoms in the bond has contributed more than half of the shared electrons in that bond.

27. Which of the following choices contains some of the elements which are naturally found in the form of a diatomic molecule?

A. H B. H, C, O, S C. H, C, N, O D. H and the halogens

28. Which of the following compounds contain 2 double covalent bonds?

A. CO2 B. CO C. BF3 D. More than 1 of the above.

29. In which of the following molecules does the central atom not follow the octet rule?

A. PCl3 B.CH4 C. H2O D. PF5

30. Which of the following atoms will be stable by having only 6 valence electrons.

A. B B. Br C. Be D. Rb

31. The shape of the BI3 molecule is called:

A. linear B. bent C. trigonal planar D. pyramidal E. tetrahedral

Short answer: There are several mistakes in the following molecule. Discuss each mistake and how to correct it. Redraw the structure correctly.

This is an example molecule. The one in the actual question is NOT identical, but it IS similar:

Br – H – O

Short answer: [Remember, you may use only your periodic table for this test.] Given 4 Formulas (similar to the modeling activity): Calculate the total valence electrons. Do the dot structure (with or without using dashes). Determine shape. Determine bond polarity. Determine molecular polarity. Determine intermolecular force.

Nomenclature/Formulas: [Remember, you may use only your periodic table for this test.]

Given 7 formulas, name each.

Given 7 names, write the formulas. Similar to the practice sheet.