to those you would Table 1.1: Bond Angles of Selected Molecules Bond-line Structure Approximate Bond Angle C. 180 :NEC-H H-Be-H :0: H 120 H. H. H. H. Critical Thinking Questions Use VSEPR to explain why the ZHBH bond angle of BH3 is 120°. (Hint: What is one-third cs 360°?) 9.

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Chapter1: Chemical Foundations
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Table 1.1: Bond Angles of Selected Molecules
Bond-line Structure
to those you would
Approximate Bond Angle
180
:NEC
H-Be-H
:0:
120
H.
H.
B-
H.
Critical Thinking Questions
9 Use VSEPR to explain why the ZHBH bond angle of BH; is 120°. (Hint: What is one-third se
360°?)
10. Both the HCH and ZHCO bond angles of H2CO (formaldehyde) are very close to 120°, but one
is slightly smaller than the other. Predict which is smaller, and explain your reasoning.
11. Use VSEPR to assign a value of "close to 180" or “close to 120" to each bond angle marked
with a dotted line. (These angles are drawn as either 90° or 180°, but may be another value.)
H
O: 0-H
H
H.
H
H N:
H
H
H
:N C:
H C H
H-
CH
H CCE
H-
CC C-H
ol doss itmbT
12. Consider the following flat drawing of methane (CH4).
What is ZHCH bond angle implied by this drawing if you assume it is flat?
a.
H -C-H
b.
Are the electron domains of this flat CH4 spread out as much as possible?
C.
Use model materials to make a model of CH4 (methane). If you assembled it correctly, the
four bonds (bonding electron domains) of your model will be 109.5° apart.
d.
in which representation, the drawing above or the model in your hand (circle one) are the
H's of CH4 more spread out around the central carbon?
Transcribed Image Text:Table 1.1: Bond Angles of Selected Molecules Bond-line Structure to those you would Approximate Bond Angle 180 :NEC H-Be-H :0: 120 H. H. B- H. Critical Thinking Questions 9 Use VSEPR to explain why the ZHBH bond angle of BH; is 120°. (Hint: What is one-third se 360°?) 10. Both the HCH and ZHCO bond angles of H2CO (formaldehyde) are very close to 120°, but one is slightly smaller than the other. Predict which is smaller, and explain your reasoning. 11. Use VSEPR to assign a value of "close to 180" or “close to 120" to each bond angle marked with a dotted line. (These angles are drawn as either 90° or 180°, but may be another value.) H O: 0-H H H. H H N: H H H :N C: H C H H- CH H CCE H- CC C-H ol doss itmbT 12. Consider the following flat drawing of methane (CH4). What is ZHCH bond angle implied by this drawing if you assume it is flat? a. H -C-H b. Are the electron domains of this flat CH4 spread out as much as possible? C. Use model materials to make a model of CH4 (methane). If you assembled it correctly, the four bonds (bonding electron domains) of your model will be 109.5° apart. d. in which representation, the drawing above or the model in your hand (circle one) are the H's of CH4 more spread out around the central carbon?
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