Molecular Geometry Lab

Molecular Geometry Lab - Part III

NOTE: Click the buttons below the structures to hi-light specific atoms within the structure and/or to rotate the structure.

Hi-light: C1 C2 H (all)

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1. a) What is the molecular geometry for each of the following central atoms in ethane, C₂H₆?

(i) carbon #1 (C1)
(ii) carbon #2 (C2)

b) Draw the Lewis Dot Structure for ethane.

c) What are the approximate bond angles around each of the central atoms?

d) What is the VSEPR # and electron group arrangement for each of the following atoms in ethane?

(i) C1
(ii) C2

Hi-light: C1 C2 C3

C4 H (all)

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2. a) What is the molecular geometry for each of the following central atoms in 2-butyne, C₄H₆?

(i) carbon #1 (C1)
(ii) carbon #2 (C2)
(iii) carbon #3 (C3)
(iv) carbon #4 (C4)

b) Draw the Lewis Dot Structure for 2-butyne.

c) What are the approximate bond angles around each of the central atoms?

d) What is the VSEPR # and electron group arrangement for each of the following atoms in 2-butyne?

(i) C1
(ii) C2
(iii) C3
(iv) C4

Hi-light:
C1 C2 C3 C4

C5 C6 H (all)

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3. a) What is the molecular geometry for each of the following central atoms in benzene, C₆H₆?

(i) carbon #1 (C1)
(ii) carbon #2 (C2)
(iii) carbon #3 (C3)
(iv) carbon #4 (C4)
(v) carbon #5 (C5)
(vi) carbon #6 (C6)

b) Draw the Lewis Dot Structure for benzene.

c) What are the approximate bond angles around each of the central atoms?

d) What is the VSEPR # and electron group arrangement for each of the following atoms in benzene?

(i) C1
(ii) C2
(iii) C3
(iv) C4
(v) C5
(vi) C6

Hi-light: C1 C2 C3

O H (all)

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4. a) Draw the Lewis Dot Structure for acetone, C₃H₆O.

b) What is the VSEPR # and electron group arrangement for each of the following atoms in acetone?

(i) carbon #1 (C1)
(ii) carbon #2 (C2)
(iii) carbon #3 (C3)
(iv) oxygen (O)

c) According to part a) above, what is the predicted molecular geometry for each of the following central atoms in acetone?

(i) C1
(ii) C2
(iii) C3

d) The structure shown at the left is the known geometry for acetone. Do your answers to part c) above differ from the structure shown at the left? Describe any differences.

Hi-light:
C N1 N2

O H (all)

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5. a) Draw the Lewis Dot Structure for urea, CH₄N₂O.

b) What is the VSEPR # and electron group arrangement for each of the following atoms in urea?

(i) carbon (C)
(ii) nitrogen #1 (N1)
(iii) nitrogen #2 (N2)
(iv) oxygen (O)

c) According to part a) above, what is the predicted molecular geometry for each of the following central atoms in urea?

(i) C
(ii) N1
(iii) N2

d) The structure shown at the left is the known geometry for urea in the solid phase. Do your answers to part c) above differ from the structure shown at the left? Describe any differences.