Concept explainers
(a)
Interpretation:
The most important Lewis structures of ring molecule below have to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Lewis structures represent covalent bonds and describe valence electrons configuration of atoms. The covalent bonds are depicted by lines and unshared electron pairs by pairs of dots. The sequence to write Lewis structure of some molecule is given as follows:
- The central atom is identified and various other atoms are arranged around it. This central atom so chosen is often the least electronegative.
- Total valence electrons are estimated for each atom.
- single bond is first placed between each atom pair.
- The electrons left can be allocated as unshared electron pairs or as multiple bonds around the
symbol of the element to satisfy the octet (or duplet) for each atom. - Add charge on the overall structure in case of polyatomic cation or anion.
The formal charge on each atom in the Lewis structure can be calculated from the equation written as follows:
Here,
(b)
Interpretation:
The most important Lewis structures of below ring molecule have to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Refer to part (a).
(c)
Interpretation:
The most important Lewis structures of below ring molecule has to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Refer to part (a).
(d)
Interpretation:
The most important Lewis structures of ring molecules have to be drawn and non- zero formal charges and lone pairs have to be shown along with any possible resonance structures.
Concept Introduction:
Refer to part (a).
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CHEMICAL PRINCIPLES (LL) W/ACCESS
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- Formamide, HC(O)NH2, is prepared at high pressures from carbon monoxide and ammonia, and serves as an industrial solvent (the parentheses around the O indicate that it is bonded only to the carbon atom and that the carbon atom is also bonded to the H and the N atoms). Two resonance forms (one with formal charges) can be written for formamide. Write both resonance structures, and predict the bond angles about the carbon and nitrogen atoms for each resonance form. Are they the same? Describe how the experimental determination of the HNH bond angle could be used to indicate which resonance form is more important.arrow_forwardDraw three resonance structures for N3-. This species has its three atoms bonded sequentially in the following fashion: N-N-N. Draw your resonance structures so that the atoms in them are bonded together in this order. Select the most important resonance structure for this species based on the formal charges on the atoms of the three resonance structures you have drawn. Now select the statement from the multiple choices which is true about this most important resonance structure.In the most important resonance structure of N3- : a) The leftmost bond (between N and N) is a single bond.b) The rightmost bond (between N and N) is a single bond.c) The formal charge on the leftmost (N) atom is -1.d) The number of nonbonding pairs (lone pairs) of electrons on the leftmost (N) atom is 4.e) The number of nonbonding (lone) pairs of electrons on the rightmost (N) atom is 4.arrow_forwardDraw three resonance structures for N3-. This species has its three atoms bonded sequentially in the following fashion: N-N-N. Draw your resonance structures so that the atoms in them are bonded together in this order. Select the most important resonance structure for this species based on the formal charges on the atoms of the three resonance structures you have drawn. Now select the statement from the multiple choices which is true about this most important resonance structure.In the most important resonance structure of N3- : a) The leftmost bond (between N and N) is a single bond. b) The rightmost bond (between N and N) is a single bond. c) The formal charge on the leftmost (N) atom is -1. d) The number of nonbonding pairs (lone pairs) of electrons on the leftmost (N) atom is 4. e) The number of nonbonding (lone) pairs of electrons on the rightmost (N) atom is 4.arrow_forward
- Draw the most plausible resonance structure for the cyanate ion, OCN− . Be sure to include all lone pair electrons and nonzero formal charges.arrow_forwardDraw out the Lewis structures for H₂CO3, HCO3, and CO32-. Then determine the maximum number of equivalent resonance structures for each species. Note that carbon is the central atom in all three cases. If the molecule contains hydrogen atoms they are attached to oxygen atoms. Only count the best structures. For example, A structure with really bad formal charges should not be counted. The molecule H₂CO3 has The molecule HCO3 has The molecule CO3²- has equivalent Lewis structures. equivalent Lewis structures. equivalent Lewis structures.arrow_forwardAn incomplete Lewis structure is shown below. The structure only shows the atoms and how they are connected. The molecule has a net charge of +1. Complete the Lewis structure giving all atoms full octets. If there is more than one way to do this, draw resonance structures showing all possibilities. If not, just draw one Lewis structure. Be sure to write in any non-zero formal charges.arrow_forward
- Consider the incomplete structure shown. Draw an alternative Lewis (resonance) structure for the incomplete structure. Show the unshared electron pairs and nonzero formal charges in your structure. Don't use radicals. Determine the formal charge on the nitrogen atom in the structure. If the atom is formally neutral, indicate a charge of zero.arrow_forwardDraw the Lewis structure for one of the possible resonance structure for the chlorate ion (ClO3−). Minimize the formal charge assigned to each atom. Include all nonzero formal charges.arrow_forwardDraw two different Lewis structures for ClO3-, one which all atoms follow the octet rule and one where the chlorine has an expanded octet. Determine the formal charge on all atoms for each structure. Which do you think is the better Lewis structure? Explain your reasoning.arrow_forward
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