3.3: Quiz 1A
- Page ID
- 18873
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- Please indicate true (T) or false (F) for the following statements based on lecture materials (2 pts each):
_____ | Based on the number of valence electrons, a carbon atom can have either three, four or five bonds. |
_____ | If a carbon atom is sp2 hybridized, then the bond angles will be 180˚. |
_____ | LiCl contains an ionic bond. |
- For each of the following condensed structures, indicate how many lone pairs each molecule has. (1 pt each, put your numerical answer in the box provided)
CH3CH2OH | CH3Cl | HONH2 | CH3CH2CH3 | |||
- (3 pts each) Draw a Lewis structure for the following species (including any lone pairs):
a) H2CO | b) [CH3NH3]+ | |
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- (2 pts) Covalent bonds may be polar or nonpolar. What property of the atoms forming a given bond determines this?
- Give an example for each of the following bond types (2 pts each):
(Note: your answer does not need to be a valid Lewis structure, you can just show two atoms in a bond.)
- (2 pts) Covalent bonds may be polar or nonpolar. What property of the atoms forming a given bond determines this?
non-polar covalent bond | polar covalent bond | |
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- (4 pts) Briefly explain why a carbon atom cannot have more than 4 bonds?
- (4 pts) Draw a structure of a molecule that has an sp-hybridized carbon that is directly attached to an sp2-hybridized carbon and clearly label these two carbon atoms with the hybridization. (Note: Your molecule can have any atoms in addition to these two carbon atoms. There are several possible answers, but make sure that your answer is a valid structure showing any hydrogens or lone pairs for full credit.)
- (4 pts) Briefly explain why a carbon atom cannot have more than 4 bonds?
- Multiple choice (2 pts each, put your letter answer in the box provided)
What is the approximate value of the Br-C-Br bond angles in carbon tetrabromide, CBr4?
- 90˚
- 109˚
- 120˚
- 180˚
Which of the following describes a carbon-carbon triple bond?
- three pi bonds
- one sigma bond and one pi bond
- two sigma bonds and one pi bond
- one sigma bond and two pi bonds
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- For the following molecule, give the hybridization of the indicated atom.
(2 pts each, put your answer in the box provided)
- For the following molecule, give the hybridization of the indicated atom.
- (2 pts each) What are the formal charges on the indicated nitrogen and oxygen atoms in the molecule shown below?