CHEMISTRY-TEXT
8th Edition
ISBN: 9780134856230
Author: Robinson
Publisher: PEARSON
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Chapter 7, Problem 7.4A
Predict which bond has greater percent ionic character,
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The dipole moment (u) of HBr (a polar covalent molecule) is 0.824D (debye), and its percent ionic character is 12.2 %. Estimate the bond length of the H-Br bond in picometers.
Note that
. 1 D 3.34 x 10-30 Cm and
in a bond with 100% ionic character, Q=1.6 x 10-19 C.
Express your answer to two significant figures and include the appropriate units.
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r =
μA
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O
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Inits input for part B
Incomplete Lewis structures for the nitrous acid molecule,HNO2, and the nitrite ion, NO2-, are shown here. (a) Completeeach Lewis structure by adding electron pairs as needed.(b) Is the formal charge on N the same or different in thesetwo species? (c) Would either HNO2 or NO2- be expected toexhibit resonance? (d) Would you expect the N=O bond inHNO2 to be longer, shorter, or the same length as the N¬Obonds in NO2?
The dinitramide ion [N(NO2)2]- was first isolated in 1996. The bond lengths of the N-N bonds in the anion are 136 and 138 picometers. Draw a realistic lewis structure for the dinitramide ion including any resonance forms and assign a formal charge to each atom. Develope an argument to either support or reject the notion that two N-N bonds should be the same length
Chapter 7 Solutions
CHEMISTRY-TEXT
Ch. 7 - Use the electro negativity values in Figure 7.4...Ch. 7 - Conceptual APPLY 7.2 An electrostatic potential...Ch. 7 - The dipole moment of AgCI in the gas phaseis...Ch. 7 - Predict which bond has greater percent ionic...Ch. 7 - Select the correct electron-dot structure for H2S...Ch. 7 - Use the octet rule to predict the molecular...Ch. 7 - Identify the correct electron-dot structure for...Ch. 7 - Draw an electron-dot structure for each of the...Ch. 7 - Select the correct electron-dot structure for...Ch. 7 - Identify the correct electron-dot structure(s) for...
Ch. 7 - Prob. 7.11PCh. 7 - Which oxygen species do you predict to be most...Ch. 7 - Draw an electron-dot structure for the following...Ch. 7 - There are two molecules with the formula C2H6O...Ch. 7 - The following structure is a representation of...Ch. 7 - Draw two possible electron-dot structures for the...Ch. 7 - Called “laughing gas, nitrous oxide (N2O) is...Ch. 7 - Draw as many resonance structures as possible for...Ch. 7 - Prob. 7.19PCh. 7 - Prob. 7.20ACh. 7 - Calculate the formal charge on each atom in the...Ch. 7 - Start with the electron-dot structure for the...Ch. 7 - Calculate formal charges on the C and O atoms in...Ch. 7 - Three resonance structures for anisole (Problem...Ch. 7 - The toxicity of the organophosphate insecticides...Ch. 7 - Prob. 7.26PCh. 7 - Prob. 7.27PCh. 7 - The following structure is a representation of the...Ch. 7 - The electron-dot structure for the nerve a gentsar...Ch. 7 - Draw the new electron-dot structures indicated by...Ch. 7 - The following diagram shows the potential energy...Ch. 7 - The following diagram shows the potential energy...Ch. 7 - Two electrostatic potential maps are shown, one of...Ch. 7 - Prob. 7.34CPCh. 7 - Which of the following drawings is most likely to...Ch. 7 - The following ball-and-stick molecular model is a...Ch. 7 - The following hall-and-stick molecular model is a...Ch. 7 - Sinapaldehyde, a compound present in the toasted...Ch. 7 - Vitamin C (ascorbic acid) has the following...Ch. 7 - Match the following descriptions with the type of...Ch. 7 - Why do two atoms come together to form a covalent...Ch. 7 - Explain the difference in the bond dissociation...Ch. 7 - Explain the difference in the bond dissociation...Ch. 7 - Predict which of the following bonds should be...Ch. 7 - Prob. 7.45SPCh. 7 - What general trends in electro negativity occur in...Ch. 7 - Predict the electro negativity of the undiscovered...Ch. 7 - Order the following elements according to...Ch. 7 - Order the following elements according to...Ch. 7 - Which of the following substances contain bonds...Ch. 7 - Use the electro negativity data in Figure 7.4 to...Ch. 7 - Show the direction of polarity for each of the...Ch. 7 - Show the direction of polarity for each of the...Ch. 7 - Which of the substances...Ch. 7 - Which of the substances...Ch. 7 - Order the following compounds according to the...Ch. 7 - Order the following compounds according to the...Ch. 7 - Prob. 7.58SPCh. 7 - Using only the elements Ca, Cl, and Si, give...Ch. 7 - The dipole moment of BrCl is 0.518 D, and the...Ch. 7 - Prob. 7.61SPCh. 7 - Prob. 7.62SPCh. 7 - Prob. 7.63SPCh. 7 - Why does the octet rule apply primarily to...Ch. 7 - Which of the following substances contains an atom...Ch. 7 - Draw electron-dot structures for the following...Ch. 7 - Draw electron-dot structures for the following...Ch. 7 - Identify the correct electron-dot structure for...Ch. 7 - Draw an electron.dot structure for the hydronium...Ch. 7 - Oxalic acid, H2C2O4 , is a mildly poisonous...Ch. 7 - Draw an electron-dot structure for carbon...Ch. 7 - Prob. 7.72SPCh. 7 - Identify the fourth-row elements, X, that form the...Ch. 7 - Write electron-dot structures for molecules with...Ch. 7 - Write electron-dot structures for molecules with...Ch. 7 - Which compound do you expect to have the stronger...Ch. 7 - Which compound do you expect to have the stronger...Ch. 7 - Draw an electron-dot structure for each of the...Ch. 7 - Prob. 7.79SPCh. 7 - Methylphenidate (C14H19NO2) , marketed as Ritalin,...Ch. 7 - Pregabalin (C8H17NO2) , marketed as Lyric a, is an...Ch. 7 - The following molecular model is that of...Ch. 7 - Ibuprofen C 13 H 18 O 2 marketed under such brand...Ch. 7 - Draw as many resonance structures as you can that...Ch. 7 - Draw as many resonance structures as you can for...Ch. 7 - Which of the following pairs of structures...Ch. 7 - Which of the following pairs of structures...Ch. 7 - Draw as many resonance structures as you can that...Ch. 7 - Draw as many resonance structures as you can that...Ch. 7 - Benzene has the following structural formula. Use...Ch. 7 - Draw three resonance structures for sulfur...Ch. 7 - Some mothballs used when storing clothes are made...Ch. 7 - Four different structures (a), (b), (c), and (d)...Ch. 7 - Draw an electron-dot structure for carbon...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Assign formal charges to the atoms in the...Ch. 7 - Calculate formal charges for the C and O atoms in...Ch. 7 - Draw two electron-dot resonance structures that...Ch. 7 - Draw two electron-dot resonance structures that...Ch. 7 - Prob. 7.102SPCh. 7 - Prob. 7.103SPCh. 7 - Boron trifluoride reacts with dimethyl ether to...Ch. 7 - Thiofulminic acid, HCNS, has recently been...Ch. 7 - Draw two rcsonancc strutur for methyl isocyanate,...Ch. 7 - In the cyanatc ion. OCN , carbon is the central...Ch. 7 - Prob. 7.108MPCh. 7 - Prob. 7.109MPCh. 7 - Prob. 7.110MPCh. 7 - The neutral OH molecule has been implicated in...Ch. 7 - Prob. 7.112MPCh. 7 - Prob. 7.113MP
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- Using the bond dissociation enthalpies in Table 8.8, estimate the enthalpy of combustion of gaseous methane, CH4, to give water vapor and carbon dioxide gas.arrow_forwardGiven the bonds C N, C H, C Br, and S O, (a) which atom in each is the more electronegative? (b) which of these bonds is the most polar?arrow_forwardBased on the concept of formal charge, what is the central atom in (a) HCN (do not include H as a possibility)? b) NOCI (Cl is always a terminal atom)?arrow_forward
- Write reasonable Lewis structures for the following species, none of which follow the octet rule. (a) BeCl2 (b) SeO2- (c) ClO3 (d) CH3arrow_forwardThree known isomers exist of N2CO, with the atoms in these sequences: NOCN; ONNC; and ONCN. Write resonance structures for each isomer and use formal charge to predict which isomer is the most stable.arrow_forwardWhat is the magnitude of the partial positive and partial negative charges in the HI molecule? (1D = 3.36 x 10¬30 c m; 1e¯ = 1.6022 x 10-19 C; bond length HI = 1.61 angstroms; dipole moment HI = 0.44 D)arrow_forward
- If the bond in the AB molecule is considered 100% ionic, the absolute value of the partial charge would be equal to the electron charge (1.602 x 10-19 C). If the distance between A and B atoms is taken as 10-10 m (1Å), the dipole moment between two elementary charges of opposite sign at atomic magnitude (1Å) distance between them is = 1.602x10-19 C x 10-10 m = 1.602 x 10- It is available in 29 Cm (or 4.8 x 10-18 esbcm). Dipole moment is given by debye (D) and 1D = 3.34x10-30 Cm (or 1D = 10-18 esbcm) (esb = electrostatic unit). 1. As can be seen, when the HCl covalent molecule is considered ionic and the bond length is 1.27x10-10 m, calculate the dipole moment. The experimental dipole moment of an HCl polar option is = 1.03 D. Calculate the value character of the H-Cl bond according to the bulletin. How many% covalent is the bond, how many% is ionic? Specifyarrow_forwardIn particular, I'd appreciate help with part b of the problem. How does one compare the bond energies between identical elements if they don't have a chart with the numbers in front of them?arrow_forwardIncomplete Lewis structures for the nitrous acid molecule,HNO2, and the nitrite ion, NO2-, are shown here. (a) Completeeach Lewis structure by adding electron pairs as needed.(b) Is the formal charge on N the same or different in thesetwo species? (c) Would either HNO2 or NO2- be expected toexhibit resonance? (d) Would you expect the N“O bond inHNO2 to be longer, shorter, or the same length as the N¬Obonds in NO2-? [Sections 8.5 and 8.6]arrow_forward
- Part B The dipole moment (u) of HBr (a polar covalent molecule) is 0.844D (debye), and its percent ionic character is 12.5 % . Estimate the bond length of the H Br bond in picometers. Note that • 1D= 3.34 x 10-30 C .m and • in a bond with 100% ionic character, Q = 1.6 x 10-19 C. Express your answer to two significant figures and include the appropriate units. HA ? r= 5.3 • 1018 pmarrow_forwardWhich of the following Lewis structures will have resonance form H | H-C | H O-H :0: H-CN: H C H || :0: 0=5=0arrow_forwardI am stuck on b I need explainingarrow_forward
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