Name:  _____________________                              date:  __________________               period: _______

Ch. 8 & 9  chemical bonds                  test                  40 points                                              honors chemistry

1. In regards to ___, use valence bond theory to describe the bonds in the chemical.  If hybrid orbitals are needed, then (i) identify the type of hybrid orbital, (ii) rationalize the type of hybrid orbital, and (iii) describe the formation of the hybrid orbital.  If hybrid orbital is not needed, then rationalize why it’s not needed to describe the bond(s) in the chemical.  Identify the hybrid orbital and / or atomic orbitals involved in the covalent bond.  [15 points]

a. PH3

b. Hydrogen chloride; assume that it’s a covalent compound.

2. Describe valence bond theory; what is the basis of the covalent bond ?  [5 points]

3. Sketch the molecular shape, the name of the molecule’s shape, and bond angle(s). for ___; hypothetical molecules ?  [10 points].

a. PO2 -

b. OI4

4.  What is the similarities / differences between a sigma- versus pi- bond ?  [10 points]


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Name:  _____________________                              date:  __________________               period: _______

Ch. 8 & 9  chemical bonds                  retest               40 points (1 ec)                                               honors chemistry

1. Describe the bonds in __; specifically . . . [16 points]

H2C=O ; there is a double bond between the carbon and oxygen atoms in the molecule; carbon is the central

a. identify the atomic orbital and / or hybrid orbital in the specific atom(s) involved in all chemical bonds in the molecule.

b. if any hybrid orbital are involved, then . . .

i. why is a hybrid orbital needed ?

ii. rationale why that specific hybrid orbital is needed ? 

iii. describe the formation of that hybrid orbital using an orbital diagram of the atom.

c. Using valence bond theory, describe all bonds in the compound.

2.  What is the basis of the bond in ___ in terms of electrostatic forces, i.e. forces due to charges ?  Also, illustrate the use of the Octet rule and (i) use the Bohr model of an atom to show if there is a transfer or sharing of electrons or (ii) use a sketch of the atomic orbital involved in the bond.  Lastly, identify the type of bond in the molecule.  [10 points]

a.  sodium chloride

b. chlorine (molecule)

3.  Is  ___ a polar or nonpolar compound ?  justify your answer, which includes a sketch showing the shape of the molecule and include the name of the shape of the molecule and its bond angle(s).  [15 points]

a.  CF3H

b.  CF4

c.  Sulfur tetrafluoride