Test bank for fundamentals of general organic and biological chemistry 7th edition by mcmurry

3 Which representation of a hydrogen molecule is not correct?. 4 Which representation of a methane molecule is not correct?. A methane molecule is composed of one carbon atom and four h

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Test Bank for Fundamentals of General Organic and Biological

Chemistry 7th Edition by McMurry

3) Which representation of a hydrogen molecule is not correct?

4) Which representation of a methane molecule is not correct? (A methane molecule

is composed of one carbon atom and four hydrogen atoms.)

6) In a covalent compound the bond length can be defined as

1 A) the distance between any two pairs of electrons

2 B) the distance between the two largest atoms

3 C) the distance between two nuclei when the repulsion is greatest

4 D) the distance between two nuclei when the attraction is greatest

5 E) the distance between two nuclei when repulsion and attraction are

7) Which group contains only elements which normally exist as diatomic molecules?

1 A) nitrogen; sulfur, bromine

2 B) helium; neon, argon

3 C) nitrogen; oxygen, fluorine

4 D) hydrogen; lithium, sodium

5 E) oxygen; phosphorus, germanium

Answer: C

Diff: 2

Section: 4.2

8) A chemical bond formed when two atoms share one pair of electrons is a bond; it is best described as

Answer: D

Diff: 2

Section: 4.5

23) Which property could describe a covalent compound?

1 A) It conducts electricity when melted

2 B) It is a gas at room temperature

3 C) It is composed of a non-metal and a metal

4 D) It conducts electricity when dissolved in water

5 E) none of the above

2 Has a definite crystal structure

III Dissolves in water, but not in organic liquids

1 Melts at 80 degrees Celsius

2 Does not conduct electricity when melted

25) Which property is most closely associated with covalent molecules?

1 A) It is a gas at room temperature

2 B) It conducts electricity when dissolved in water

3 C) It has a very high melting point

4 D) It is composed of a metal and a nonmetal

pairs on one or more atoms Note that both of these include pairs of electrons Also

most of these atoms obey the octet rule, which means that each atom has eight electrons in its outer shell The most common exception to the octet rule is

hydrogen, which usually has two electrons Note again that these numbers are

all even numbers

36) A molecule in which the central atom forms one double bond and two single bonds is said to have a shape

1 A) bent; two; two

2 B) linear; two; two

3 C) pyramidal; three; one

4 D) tetrahedral; four; zero

5 E) planar triangular; three; one

Diff: 2

Section: 4.7, 4.8

42) The bond angle in the molecule H2S is because the

109 A) exactly 109.5°; S atom has four charge clouds

110 B) greater than 109.5°; lone pairs allow the bond angle to expand

111 C) less than 109.5°; lone pairs force the hydrogen atoms closer together

112 D) exactly 120°; lone pairs are counted as one charge cloud

113 E) exactly 180°; the S atom has two bonds

46) A section of the Periodic Table containing main group elements is shown Which

bond would be least polar?

47) A section of the Periodic Table containing main group elements is shown If the elements W, X, Y, and Z have electronegativity values of 1.0, 2.0, 2.5, and 3.5,

respectively, which bond is the least polar?

Se bond can be considered almost and the molecule is

1 A) the number of atoms bonded to the atom of interest

2 B) the total number of atoms in the molecule

3 C) the number of electron pairs on the atom of interest

4 D) both A and C

5 E) none of the above

Answer: D

Diff: 3

Section: 4.10

55) A molecule that contains three identical polar bonds to the central atom will be

1 A) nonpolar if the geometry is planar triangular

2 B) polar in all cases

3 C) nonpolar in all cases

4 D) impossible to tell the polarity

5 E) either polar or nonpolar depending on the identity of the atoms bonded to the central atom

Answer: A

Diff: 3

Section: 4.10

56) Explain how it is possible for CCl4 to have polar bonds but be a non-polar

molecule A diagram may be helpful in your answer, but it must be explained

Answer: (This question could also be asked about CF4 or CO2.)

The bonds in this compound are polar due to the difference in their

electronegativity values However, the molecule is not polar because the molecule is symmetrical, which means that the polar forces in different directions balance each other out In this case, the overall distribution of electrons in the molecule is even Diff: 2

1 C) CCI4

66) dinitrogen tetroxide Diff: 1

Section: 4.10

67) bromine pentafluoride Diff: 1

Section: 4.10

70) phosphorus trichloride Diff: 1

Section: 4.10

71) carbon monoxide Diff: 1

Section: 4.10