Chemistry Name Test: Covalent Bonding Multiple Choice

[Pages:4]Chemistry Test: Covalent Bonding

Name__________________________

Multiple Choice Directions: Identify the choice that best completes the statement or answers the question.

1. The force that holds atoms together is referred to as a ______.

a. cation

b. chemical bond

c. formula unit

d. lattice

2. A covalent bond occurs when atoms _______ electrons.

a. share

b. transfer

3. Compounds that contain covalent bonds have _____ melting points.

a. high

b. low

4. Which type of bond has one pair of electrons shared between atoms?

a. single covalent

b. single ionic

c. double covalent

d. double ionic

5. Water is a _____ substance.

a. polar

b. nonpolar

c. ionic

6. Chlorine is a diatomic molecule. Chlorine is ________ molecule.

a. polar

b. nonpolar

7. A double covalent bond occurs when two atoms share _____ electrons.

a. 1

b. 2

c. 3

d. 4

8. A molecule is considered polar if the bonds are arranged ______.

a. symmetrically

b. asymmetrically (not symmetrical)

9. There are _____ diatomic elements on the periodic table.

a. 4

b. 5

c. 6

d. 7

10. Electronegativity increases as you move _____ across a period.

a. left to right

b. right to left

11. Which of the following elements has the highest electronegativity?

a. bromine

b. chlorine

c. fluorine

d. iodine

12. A covalent bond in which the electrons are shared equally is classified as ______.

a. polar

b. nonpolar

c. ionic

13. If the bonds are polar, the molecule is also polar.

a. always true

b. sometimes true

c. never true

14. Covalently bonded molecules consist of a nonmetal bonded to a _____.

a. metal

b. nonmetal

15. Covalently bonded molecules conduct electricity in the liquid state.

a. true

b. false

16. Atoms form covalent bonds in an attempt to have an outer level that contains _____ electrons.

a. 0

b. 4

c. 6

d. 8

17. Hydrogen is an exception to the octet rule and is stable when it has _____ electrons in the outer

energy level.

a. 0

b. 1

c. 2

d. 3

18. Which of the following elements does NOT exist as a diatomic molecule?

a. hydrogen

b. oxygen

c. carbon

d. nitrogen

Answer questions 19-21 about the element carbon.

19. An atom of carbon has _____ valence electrons.

a. 2

b. 4

c. 6

d. 8

20. How many single covalent bonds can an atom of carbon form?

a. 1

b. 2

c. 3

d. 4

21. A diatomic oxygen molecule forms what type of bond?

a. single

b. double

c. triple

d. all of the above

22. Which covalent molecule shown below has the strongest bond?

23. The molecule pictured below can be classified as what molecular shape?

a. bent

b. linear

c. tetrahedral

d. trigonal pyramidal

24. A molecule is formed when two or more atoms form a covalent bond. According to this definition,

which of these is NOT a molecule?

a. NaCl

b. H2

c. HCl

d. NH3

25. The bond that holds two fluorine atoms together in an F2 molecule would be classified as nonpolar covalent because _____. a. both atoms are different and the difference in electronegativity is large. b. both atoms are different and the difference in electronegativity is zero. c. both atoms are the same and the difference in electronegativity is large. d. both atoms are the same and the difference in electronegativity is zero.

26. What is the molecular shape of the compound H2O?

a. bent (angular)

b. linear

c. tetrahedral

d. trigonal pyramidal

27. Which of the following is the correct name for the compound N2O3? a. nitrogen oxide b. nitrogen trioxide c. trinitrogen dioxide d. dinitrogen trioxide

28. Which of the following is the correct name for the compound PCl5?

a. monophosphorus tetrachloride

c. phosphorus pentachloride

b. phosphorus chloride

d. pentaphosphorus chloride

29. Which is the correct formula for the compound dinitrogen monoxide?

a. NO2

b. (NO)2

c. N2O1

d. N2O

30. Which is the correct formula for the compound sulfur hexachloride?

a. S6Cl

b. SCl6

c. SCl5

d. S2Cl3

Use the diagram below to answer questions 31-34

31. The molecule represented by the diagram above would be described as having what molecular shape?

a. bent (angular)

b. linear

c. tetrahedral

d. trigonal pyramidal

32. The bonds in the molecule represented above are _____.

a. polar

b. nonpolar

c. ionic

33. The molecule represented by the diagram above is _____.

a. polar

b. nonpolar

34. The name of the compound represented by the diagram above is _____.

a. carbon chloride

c. carbon tetrachloride

b. monocarbon tetrachloride

d. tetrachlorine monocarbide

Use the diagram below to answer questions 35-38.

35. The molecule represented by the diagram above would be described as having what molecular shape?

a. bent (angular)

b. linear

c. tetrahedral

d. trigonal pyramidal

36. The bonds in the molecule represented above are _____.

a. polar

b. nonpolar

c. ionic

37. The molecule represented by the diagram above is _____.

a. polar

b. nonpolar

38. The name of the compound represented by the diagram above is _____.

a. nitrogen hydride

c. nitrogen trihydride

b. hydrogen nitride

d. mononitrigen trihydride

Matching Match each shape with its name:

39. Tetrahedral

a.

40. Trigonal pyramidal

b.

41. Bent

c.

42. Linear

d.

Directions: Match the formulas with the correct names.

43. S8O5 44. S3O4 45. S6O7

a. trisulfur tetraoxide b. hexasulfur heptaoxide c. octasulfur pentoxide

Directions: Match the names with the correct formula.

46. Disilicon tetrachloride 47. Trinitrogen hexafluoride 48. Pentabromine heptachloride

a. N3F6 b. Br5Cl7 c. Si2Cl4

49. A gaseous compound is found to have the following composition: 30.5% nitrogen and 69.5% oxygen.

Determine the empirical formula for this compound.

A-N2O

B- NO2

C- N2O2

D- NO

50. If the compound in #49 has a molecular molar mass of 91.8 g/mol. Determine the molecular formula

of the compound.

A- N2O2

B-N4O2

C-N4O4

D-N2O4

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