Concept explainers
Interpretation: The conclusions derived by student from model 2 should be explained.
Concept introduction: Lewis structure is representation of molecule in that dots are shown to represent unshared electrons and lines are shown to represent bonds. These lines and dots represent distribution of electrons in the molecule.
When one single structure is unable to describe all the properties of single-molecule, a phenomenon called resonance comes into play. This arises when two or more than two Lewis structures are possible for one molecule. All such structures are called resonating structures and have same placement of atoms in them but these have different locations of bond pairs and lone pairs. The resonating structures are inter-convertible with each other. The resultant of all the resonating or contributing structures is called the resonance hybrid.
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Organic Chemistry: A Guided Inquiry
- A student draws the picture of ammonia (NH3) in the box below, left, and predicts it will be a flatmolecule with HNH bond angles of exactly 120°. Unfortunately, the student left something out. a. What did the student omit from his drawing? b. What is the actual HNH bond angle of ammonia (based on the draw g above, right)? c. Explain why water, ammonia, and methane (shown below) all have about the same bondangles (close to 109.5°) even though they have different numbers of bonds.arrow_forward6. Good question. A molecule with zero formal charges on all atoms is drawn below. Identify which group of the periodic table each of the elements X, Y, Z, and A, belong to. A A A -X A A :Z-A Ÿ-Aarrow_forwardWhich of the highlighted chemical bonds in the molecules below is longest? Shortest? In between? Which highlighted bond requires the highest energy to break? Lowest? In between? Answer these questions by completing the second and third columns in the table. compound HI H -Si-H | H H | H-Ge-H | H HICIH Η HIC-H Η length of highlighted bond choose one choose one choose one - V - V energy of highlighted bond choose one - choose one - choose one - ✓ X Śarrow_forward
- Which of the following species is a valid resonance structure of A? Usecurved arrows to show how A is converted to any valid resonancestructure. When a compound is not a valid resonance structure of A,explain why not.arrow_forwardtion 3 of 30 a) Which molecules have polar bonds? H. 1. CH, CH, CH; H,C CH, CH, Cl H.arrow_forwardA. в. с. Figure 4-8 D. СН3 0: сн. H cle 2 СН3 СН3 - н CH2 ва Бе СН3 fo: H Le :CH₂ CH 3 того CH Снзarrow_forward
- Calculate AHxn 09. CH4 + Cl₂ ⇒ CH₂Cl + HCI NH3 + O₂ → H₂O + NO Bond HIM H-N 614 H-F H-C H-Br 190 C-C 610 CMC CIN CIN CIN 610 110 CHO C C 79988 Bond Energy (kJ/mol) 436 414 389 464 368 565 431 364 297 347 119 837 305 615 891 360 SPEZ 3072 339 Bond NON NIN NIO NHO N-F N-C N-Br 1-N Bond Energy (kJ/mol) 163 0-0 OND 0-F 910 0-1 kupor C-F C1C 418 946 222 590 222 200 243 159 495 190 203 234 159 253 243 Bond Bri-F 8-5291 FIC 1-Br S--N $-5 SC 3-0 50 810 Sins S-F S-C1 4-5 Bond Energy (kJ/mol) 217 216 5-5 308 175 A 323 265 348 523 464 418 327 753 218 266arrow_forwardWhat is delocalization energy? How is it related to resonance energy? Answer by selecting all true statements. 00 Resonance energy is a term used in VB theory. Resonance energy and delocalization energy are term that describe different conditions. Resonance energy is a term used in MO theory. Resonance energy and delocalization energy are essentially the same thing. Resonance energy and delocalization energy represent the additional stability associated with a spreading out of electron density. Delocalization energy is a term used in VB theory. Delocalization energy is a term used in MO theory. Resonance energy and delocalization energy represent the additional stability associated with concentrating electron density.arrow_forwardOf the bonds C-C, C=C, and C=C, the C-C bond is strongest/longest В weakest/shortest c) weakest/longest strongest/shortest E intermediate in both strength and lengtharrow_forward
- Give typed full explanation Look at figure 3-22 that shows the electron density that occurs abound the Si-O bond. This electron density map gives the "shape" of the O and Si atoms when they are bonded together. Think about the answer in Q9 and choose the best response below: (Select answer choice) a. This figure shows that the Si and O atoms, when they bond together, do not form spheres, which is due to the fact that the Si-O bond is strongly covalent and these shared electrons affect atomic shape. This change in shape limits the applicability of Pauling's Coordination principle since that principle is based on the geometry of perfect spheres. b. This figure shows that the Si and O atoms, when they bond together are close to perfect spheres, which is due to the fact that the Si-O bond is strongly covalent. This figure shows that Pauling's Coordination principle should apply very precisely to any substance that contains Si-O bonds c. This figure shows that the Si and O atoms, form in a…arrow_forwardWhich of the highlighted chemical bonds in the molecules below is longest? Shortest? In between? Which highlighted bond requires the highest energy to break? Lowest? In between? Answer these questions by completing the second and third columns in the table.arrow_forwardH H TI H (1) H C H H H (3) H C H H The ideal value for bond angle (1) is (Choose one) ▼ and the ideal value for bond angle (3) is (Choose one) degrees, the value for bond angle (2) is (Choose one) degrees. degrees,arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning