AP Chemistry Lewis Structures

Which of the diagrams above best represents the CH2O molecule, and why?

• Diagram 1, because all bond angles are 180°.

• Diagram 1, because all atoms have a formal charge of 0.

• Diagram 2, because the molecule has a trigonal pyramidal shape.

• Diagram 2, because all atoms have a formal charge of 0.

Tags

NGSS.HS-PS1-3

Based on formal charges, which of the following is the best Lewis electron-dot diagram for H₃NO?

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Tags

NGSS.HS-PS1-2

Which of the Lewis diagrams shown above is the more likely structure of CO₂, and why?

• Diagram 1, because all the atoms have a formal charge of 0.

• Diagram 1, because double bonds are stronger than triple bonds.

• Diagram 2, because all the atoms have a formal charge of 0.

• Diagram 2, because triple bonds are stronger than double bonds.

Tags

NGSS.HS-PS1-2

Which of the following Lewis diagrams represents a molecule that is polar?

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Which of the following correctly compares the strength of the two carbon-to-carbon bonds in the molecule represented in the Lewis diagram shown above?

• The carbon-to-carbon bond on the left is stronger because it is a double bond.

• The carbon-to-carbon bonds are the same strength because the C-C-C bond angle is 180°.

• The carbon-to-carbon bonds are the same strength because they are both bonds between carbon atoms.

• The carbon-to-carbon bond on the right is stronger because there are more hydrogen atoms attached to the rightmost carbon atom than to the leftmost carbon atom.

Based on the Lewis diagram for NH₃, shown above, the H-N-H bond angle is closest to which of the following?

• 60°

• 90°

• 109.5°

• 120°

Which has a central atom with less than an octet of electrons:

• H₂O

• NH₃

• BH₃

• CH₄

• SiH₄

Which has a trigonal-pyramidal molecular geometry:

• H₂O

• NH₃

• BH₃

• CH₄

• SiH₄

Which has 2 lone pairs of electrons:

• H₂O

• NH₃

• BH₃

• CH₄

• SiH₄

Which is predicted to have the largest bond angle

• H₂O

• NH₃

• BH₃

• CH₄

• SiH₄