객관식
Which of the following best describes the Lewis structure of (methane)?
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1. A Review of General Chemistry
Lewis Structure
객관식
Which of the following statements correctly describes the Lewis structure of the carbonate ion ?
A
It has three equivalent resonance structures, each with one double bond and two single bonds between carbon and oxygen atoms.
B
All three bonds are single bonds in every resonance structure.
C
It contains a carbon atom with a lone pair of electrons.
D
The negative charges are always localized on the same oxygen atom in all resonance forms.
검증된 단계별 안내1
Recall that the carbonate ion, \( \mathrm{CO_3^{2-}} \), has resonance structures because the double bond can be placed between the carbon and any one of the three oxygen atoms.
Draw the Lewis structure with carbon in the center bonded to three oxygen atoms. Assign one double bond and two single bonds to oxygen atoms in each resonance form, ensuring the octet rule is satisfied for all atoms.
Recognize that the three resonance structures are equivalent because the double bond can be on any of the three C–O bonds, making all C–O bonds equivalent by resonance.
Note that in each resonance structure, the negative charges are delocalized and not localized on a single oxygen atom; the negative charge is spread over the oxygens through resonance.
Understand that the carbon atom does not have any lone pairs in the carbonate ion; all valence electrons around carbon are involved in bonding.
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