Question

1. Consider the hydrogen cyanide molecule, HCN, and its Lewis formula: H-C?N: (a) What is the total number of atoms and nonbonding electron pairs are around the central atom (the C atom)? _ (b) What is its parent structure? (c) What is the H-C-N bond angle? (d) Is the shape of the molecule the same or different from its parent structure? 2. Consider the SF2 molecule and its Lewis formula: F-S-F (a) What is the total number of atoms and nonbonding electron pairs are around the central atom? (b) What is its parent structure? (c) From the model kit, choose a connector piece (atom) that corresponds to the parent structure. (i) Build a 3-D model of this molecule. (ii) Use the connecting "sticks" to represent bonding electrons to another atom. (iii) Do not use a connecting "stick" when there is only a nonbonding electron in a position. Instead use a blue or green "paddle". (iv) Draw a picture of your model here: (d) What is the F-S-F bond angle? (e) Is the shape of the molecule the same or different from its parent structure? (f) Use one or two words to describe the shape of the molecule considering only the atoms, not the "invisible" nonbonding electron pairs. ______

          1. Consider the hydrogen cyanide molecule, HCN, and its Lewis formula: H-C?N:
(a) What is the total number of atoms and nonbonding electron pairs are around the central atom (the C
atom)? _______
(b) What is its parent structure? ________________
(c) What is the H-C-N bond angle? ________
(d) Is the shape of the molecule the same or different from its parent structure? ________________

2. Consider the SF2 molecule and its Lewis formula: F-S-F
(a) What is the total number of atoms and nonbonding electron pairs are around the central atom? ____
(b) What is its parent structure? ________________
(c) From the model kit, choose a connector piece (atom) that corresponds to the parent structure.
(i) Build a 3-D model of this molecule.
(ii) Use the connecting "sticks" to represent bonding electrons to another atom.
(iii) Do not use a connecting "stick" when there is only a nonbonding electron in a position.
Instead use a blue or green "paddle".
(iv) Draw a picture of your model here:

(d) What is the F-S-F bond angle? ________
(e) Is the shape of the molecule the same or different from its parent structure? ________________
(f) Use one or two words to describe the shape of the molecule considering only the atoms, not the
"invisible" nonbonding electron pairs. ________________

1. Consider the hydrogen cyanide molecule, HCN, and its Lewis formula: H-C?N:
(a) What is the total number of atoms and nonbonding electron pairs are around the central atom (the C
atom)?
(b) What is its parent structure?
(c) What is the H-C-N bond angle?
(d) Is the shape of the molecule the same or different from its parent structure?

2. Consider the SF2 molecule and its Lewis formula: F-S-F
(a) What is the total number of atoms and nonbonding electron pairs are around the central atom?
(b) What is its parent structure?
(c) From the model kit, choose a connector piece (atom) that corresponds to the parent structure.
(i) Build a 3-D model of this molecule.
(ii) Use the connecting "sticks" to represent bonding electrons to another atom.
(iii) Do not use a connecting "stick" when there is only a nonbonding electron in a position.
Instead use a blue or green "paddle".
(iv) Draw a picture of your model here:

(d) What is the F-S-F bond angle?
(e) Is the shape of the molecule the same or different from its parent structure?
(f) Use one or two words to describe the shape of the molecule considering only the atoms, not the
"invisible" nonbonding electron pairs.

Added by Craig M.

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