객관식
After drawing the Lewis structure of BH3, which of the following best describes the polarity of the BH3 molecule?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
객관식
Which of the following statements correctly describes the Lewis dot structure of the neutral compound CH2Br (bromomethane)?
A
The carbon atom has one lone pair and forms single bonds with two hydrogen atoms and one bromine atom.
B
The central carbon atom forms double bonds with both hydrogen atoms and a single bond with bromine.
C
The central carbon atom forms single bonds with two hydrogen atoms and one bromine atom, and has no lone pairs.
D
The bromine atom forms a double bond with carbon and has no lone pairs.
검증된 단계별 안내1
Recall that the Lewis dot structure represents the valence electrons of atoms in a molecule, showing bonds as shared electron pairs and lone pairs as dots around atoms.
Determine the total number of valence electrons in CH2Br: Carbon has 4, each hydrogen has 1, and bromine has 7 valence electrons. Sum these to find the total electrons to be distributed.
Identify the central atom, which is usually the least electronegative element that can form multiple bonds; here, carbon is the central atom bonded to two hydrogens and one bromine.
Assign single bonds between carbon and each hydrogen and bromine atom, using 2 electrons per bond, and then distribute the remaining electrons to satisfy the octet rule for carbon and bromine, remembering hydrogen only needs 2 electrons.
Check for lone pairs: Carbon typically has no lone pairs in such compounds, while bromine usually has three lone pairs to complete its octet; verify that the structure has no double bonds and that all atoms have complete valence shells.
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