Chemistry Chemistry Practice Problems Solutions Library

Bond Energy Solutions Library

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Bond Energy

Q. Bond enthalpy is _____A) always positive B) always negativeC) sometimes positive, sometimes negative D) always zero E) unpredictable

Solved • Mar 20, 2020

Bond Energy

Q. Use the given bond enthalpies to estimate ∆H for the following reaction:CH4(g) + 2 F2(g) → CF4(g) + 2 H2(g)Bond enthalpies:C−F 450. kJ mol−1    C−H...

Solved • Nov 29, 2019

Bond Energy

Q. As the number of bonds between two carbon atoms increases, which one of the following decreases?A. number of electrons between the carbon atomsB. b...

Solved • Nov 21, 2019

Bond Energy

Q. Place the following in order of decreasing bond length. H-F     H-I     H-Bra. H-I > H-F > H-Brb. H-I > H-Br > H-Fc. H-F > H-Br >...

Solved • Oct 11, 2019

Bond Energy

Q. Compared to a C=C double bond, a C-C single bond has _____ bond order, _____ bond length, and ______ bond energy.a. lower, longer, less b. lower, s...

Solved • Oct 11, 2019

Bond Energy

Q. Calculate the magnitude of the enthalpy change, and determine if the reaction is exothermic or endothermic for the following reaction: NH3 + 3F2 ⟶ ...

Solved • Oct 4, 2019

Bond Energy

Q. From the bond energies given below, estimate the ΔH° for the reaction:H2(g) + I2(g) → 2HI(g)Bond energies (kJ/mol):H–H = 436H–I = 297I–I = 151

Solved • Sep 18, 2019

Bond Energy

Q. Of the bonds C—C, C=C, and C≡C, the C—C bond is ____.a. strongest/shortestb. strongest/longestc. weakest/longestd. weakest/shorteste. intermediate ...

Solved • Aug 2, 2019

Bond Energy

Q. Bond enthalpy is _____.a. always positiveb. always negativec. sometimes positive, sometimes negatived. always zeroe. unpredictable

Solved • Aug 2, 2019

Bond Energy

Q. Which of the molecules or ions below will have the shortest nitrogen-oxygen bond?a. NO+b.NO2- c. NO3-

Solved • Jul 9, 2019

Bond Energy

Q. The rates of many atmospheric reactions are accelerated by the absorption of light by one of the reactants. For example, consider the reaction betw...

Solved • Dec 6, 2018

Bond Energy

Q. Consider the following reaction:H2O(g) + Cl 2O(g) → 2HOCl(g)     K 298 = 0.090For Cl2O(g),       ΔG°f = 97.9 kJ/mol       ΔH°f = 80.3 kJ/mol       ...

Solved • Dec 3, 2018

Bond Energy

Q. Consider the following reaction:A2 + B2 → 2AB   ΔE = -285 kJThe bond energy for A2 is one-half the amount of the AB bond energy. The bond energy of...

Solved • Nov 27, 2018

Bond Energy

Q. Consider the following reaction:Estimate the carbon–fluorine bond energy, given that the C—C bond energy is 347 kJ/mol, the C=C bond energy is 614 ...

Solved • Nov 27, 2018

Bond Energy

Q. The major industrial source of hydrogen gas is by the following reaction:CH4(g) + H2O(g) → CO(g) + 3H 2(g)Use bond energies to predict ΔE for this ...

Solved • Nov 27, 2018

Bond Energy

Q. Use bond energies to predict ΔE for the following reaction:H2S(g) + 3F2 (g) → SF4 (g) + 2HF(g)

Solved • Nov 27, 2018

Bond Energy

Q. Acetic acid is responsible for the sour taste of vinegar. It can be manufactured using the following reaction:Use tabulated values of bond energies...

Solved • Nov 27, 2018

Bond Energy

Q. Use bond energies from the following table to predict ΔE for the isomerization of methyl isocyanide to acetonitrile:   CH3N ≡ C(g) → CH 3C ≡ N(g)

Solved • Nov 27, 2018

Bond Energy

Q. Place the species below in order of the shortest to the longest nitrogen–oxygen bond.H2NOH, N2O, NO+, NO2-, NO3- (H2NOH exists as H2NO—OH.)

Solved • Nov 27, 2018

Bond Energy

Q. Order the following species with respect to carbon–oxygen bond length (longest to shortest).CO, CO2, CO3 -2, CH3OHWhat is the order from the weakes...

Solved • Nov 27, 2018

Bond Energy

Q. Consider the following bond lengths:C-O 143 pmC=O 123 pmC≡O 109 pmIn the CO32- ion, all three C-O bonds have identical bond lengths of 136 pm. Why?

Solved • Nov 27, 2018

Bond Energy

Q. Consider the following energy changes:Magnesium oxide exists as Mg 2+O2- and not as Mg +O-. Explain.

Solved • Nov 27, 2018

Bond Energy

Q. Write Lewis structures for CO32-, HCO3-, and H2CO3. When acid is added to an aqueous solution containing carbonate or bicarbonate ions, carbon diox...

Solved • Nov 26, 2018

Bond Energy

Q. Which member of the following pairs would you expect to be more energetically stable? Justify each choice.a. NaBr or NaBr 2

Solved • Nov 26, 2018

Bond Energy

Q. Look up the energies for the bonds in CO and N 2. Although the bond in CO is stronger, CO is considerably more reactive than N2. Give a possible ex...

Solved • Nov 26, 2018

Bond Energy

Q. Use bond energy values to estimate ΔE for the following gas phase reaction:C2H4 + H2O2 → CH2OHCH2OH

Solved • Nov 26, 2018

Bond Energy

Q. The following plot shows the potential energy of two Cl atoms as a function of the distance between them.What is the approximate bond strength for ...

Solved • Nov 12, 2018

Bond Energy

Q. The following plot shows the potential energy of two Cl atoms as a function of the distance between them.If the Cl2 molecule is compressed under hi...

Solved • Nov 12, 2018

Bond Energy

Q. Sulfur tetrafluoride (SF4) reacts slowly with O2 to form sulfur tetrafluoride monoxide (OSF4 ) according to the following unbalanced reaction: SF4(...

Solved • Nov 12, 2018

Bond Energy

Q. Butadiene, C4H6, is a planar molecule that has the following carbon-carbon bond lengths: Based on your answer for Part D, discuss what additi...

Solved • Nov 12, 2018

Bond Energy

Q. The following plot shows the potential energy of two Cl atoms as a function of the distance between them. We know that the Cl2 molecule ex...

Solved • Nov 12, 2018

Bond Energy

Q. Formation of the H2 molecule as atomic orbitals overlap.From the graph, what is the bond length in the H2 molecule?

Solved • Nov 12, 2018

Bond Energy

Q. Hydrogen peroxide is sold commercially as an aqueous solution in brown bottles to protect it from light. Calculate the longest wavelength of light ...

Solved • Nov 12, 2018

Bond Energy

Q. Consider the lattice energies of the following Group 2A compounds: BeH 2, 3205 kJ/mol; MgH2, 2791 kJ/mol; CaH2, 2410 kJ/mol; SrH2, 2250 kJ/mol; BaH...

Solved • Nov 12, 2018

Bond Energy

Q. Predict whether the N-O bonds in NO3- are stronger or weaker than the N-O bond in NO+.

Solved • Nov 12, 2018

Bond Energy

Q. The partial Lewis structure that follows is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies the octet rule, and...

Solved • Nov 12, 2018

Bond Energy

Q. True or false:The C-C bond in acetylene, HCCH, is longer than the average C-C bond length in benzene.

Solved • Nov 12, 2018

Bond Energy

Q. Is the nitrogen–oxygen bond in NO+ longer, shorter, or the same length as the nitrogen–oxygen bond in NO? Complete the explanation.

Solved • Nov 12, 2018

Bond Energy

Q. A new compound is made that has an N-N bond length of 1.49 Å.Is this bond likely to be a single, double, or triple N-N bond?

Solved • Nov 12, 2018

Bond Energy

Q. A new compound is made that has a carbon-carbon bond length of 1.15 Å. Is this bond likely to be a single, double, or triple carbon-carbon bond?

Solved • Nov 12, 2018

Bond Energy

Q. We have just arrived at a bonding description for the formaldehyde molecule. Which of the following statements about the molecule is or are true?Tw...

Solved • Nov 12, 2018

Bond Energy

Q. Mothballs are composed of naphthalene, C10H8, a molecule that consists of two six-membered rings of carbon fused along an edge, as shown in this in...

Solved • Nov 12, 2018

Bond Energy

Q. Consider the ionic compounds KF, NaCl, NaBr, and LiCl.Use ionic radii to estimate the cation-anion distance for each compound.

Solved • Nov 12, 2018

Bond Energy

Q. The As-As bond length in elemental arsenic is 2.48 Å. The Cl-Cl bond length in Cl2 is 1.99 Å.What bond length is predicted for AsCl3, using the ato...

Solved • Nov 12, 2018

Bond Energy

Q. If you were to put HBr under very high pressure, so its bond length decreased significantly, would its dipole moment increase, decrease, or stay th...

Solved • Nov 12, 2018

Bond Energy

Q. Based on Lewis structures, predict the ordering, from shortest to longest, of N - O bond lengths in NO+, NO2-, and NO3-.

Solved • Nov 12, 2018

Bond Energy

Q. Would you expect the O-O bond in O2 to be shorter or longer than the O-O bond in compounds that contain an O-O single bond? Explain.

Solved • Nov 12, 2018

Bond Energy

Q. NaCl and KF have the same crystal structure. The only difference between the two is the distance that separates cations and anions.CompoundLattice ...

Solved • Nov 12, 2018

Bond Energy

Q. The structure of borazine, B3N3H6, is a six-membered ring of alternating B and N atoms. There is one H atom bonded to each B and to each N atom. Th...

Solved • Nov 12, 2018

Bond Energy

Q. Explain the following.The peroxide ion, O22-, has a longer bond length than the superoxide ion, O2-.

Solved • Nov 12, 2018

Bond Energy

Q. Under special conditions, sulfur reacts with anhydrous liquid ammonia to form a binary compound of sulfur and nitrogen. The compound is found to co...

Solved • Nov 12, 2018

Bond Energy

Q. An important reaction for the conversion of natural gas to other useful hydrocarbons is the conversion of methane to ethane: 2 CH4(g) → C2H6(g) + H...

Solved • Nov 12, 2018

Bond Energy

Q. Arrange SO2, SO3, and SO32- in order of decreasing S-O bond distance.

Solved • Nov 12, 2018

Bond Energy

Q. Using bond enthalpies in the table, estimate H for the following gas-phase reactions.Average Bond Enthalpies (kJ/mol)Single BondsC-H413N-H391O-H463...

Solved • Nov 12, 2018

Bond Energy

Q. Ionizing an H2 molecule to H2+ changes the strength of the bond.Based on the description of covalent bonding given previously, do you expect the H-...

Solved • Nov 12, 2018

Bond Energy

Q. Estimate the As-I bond length from the data in the figure.

Solved • Nov 12, 2018

Bond Energy

Q. Use bond energies to calculate ΔHrxn for the reaction: N2(g) + 3H2(g) → 2NH3(g)Average Bond EnergiesBondBond Energy(kJ/mol)N≡N946H-H436N-H389

Solved • Nov 12, 2018

Bond Energy

Q. Another potential future fuel is methanol (CH3OH). Write a balanced equation for the combustion of gaseous methanol and use bond energies to calcul...

Solved • Nov 12, 2018

Bond Energy

Q. Ethanol is a possible fuel. Use average bond energies to calculate ΔHrxn for the combustion of ethanol.CH3CH2OH(g) + 3 O2(g) → 2 CO2(g) + 3 H2O(g)

Solved • Nov 12, 2018

Bond Energy

Q. cis-2-Butene isomerizes to trans-2-butene via the following reaction .If the energy for isomerization came from light, what minimum frequency of li...

Solved • Nov 12, 2018

Bond Energy

Q. cis-2-Butene isomerizes to trans-2-butene via the following reaction:If isomerization requires breaking the π bond, what minimum energy is required...

Solved • Nov 12, 2018

Bond Energy

Q. Consider the halogenation of ethene, where X is a generic halogen: H2C=CH2(g) + X2(g) → H2CX-H2CX(g)Use bond energies to determine which halogen pr...

Solved • Nov 12, 2018

Bond Energy

Q. Which of the two compounds, H2NNH2 and HNNH, has the strongest nitrogen-nitrogen bond, and which has the shorter nitrogen-nitrogen bond.

Solved • Nov 12, 2018

Bond Energy

Q. When a firecracker explodes, energy is obviously released. The compounds in the firecracker can be viewed as being "energy rich." What does this me...

Solved • Nov 12, 2018

Bond Energy

Q. Use average bond energies together with the standard enthalpy of formation of C(g) (718.4 kJ/mol ) to estimate the standard enthalpy of formation o...

Solved • Nov 12, 2018

Bond Energy

Q. Compare the value you obtain using average bond energies to the actual standard enthalpy of formation of gaseous benzene, 82.9 kJ/mol. What does th...

Solved • Nov 12, 2018

Bond Energy

Q. The standard state of sulfur is solid rhombic sulfur. Use the appropriate standard heats of formation given in Appendix II in the textbook to find ...

Solved • Nov 12, 2018

Bond Energy

Q. Use the dipole moments of HF and HCl (HCl µ = 1.08 D;{ m{D}}, HF µ = 1.82 D;{ m{D}}) together with the percent ionic character of each bond (HCl 20...

Solved • Nov 12, 2018

Bond Energy

Q. Calculate the heat of atomization (the heat required to convert a molecule in the gas phase into its constituent atoms in the gas phase) of C2H3Cl,...

Solved • Nov 12, 2018

Bond Energy

Q. Ethane, a minority component of natural gas, burns to form carbon dioxide and water according to this reaction: 2 H3C-CH3(g) + 7 O2(g) → 4 CO2(g) +...

Solved • Nov 12, 2018

Bond Energy

Q. In the Chemistry and the Environment box on free radicals in Chapter 9 in the textbook, we discussed the importance of the hydroxyl radical in reac...

Solved • Nov 12, 2018

Bond Energy

Q. Consider the following three compounds: HCCH, H2CCH2, H3CCH3. Order these compounds in order of increasing carbon-carbon bond strength.

Solved • Nov 12, 2018

Bond Energy

Q. Consider the following three compounds: HCCH, H2CCH2, H3CCH3. Order these compounds in order of decreasing carbon-carbon bond length.

Solved • Nov 12, 2018

Bond Energy

Q. Hydrogenation reactions are used to add hydrogen across double bonds in hydrocarbons and other organic compounds. Use average bond energies to calc...

Solved • Nov 12, 2018

Bond Energy

Q. Consider the reaction: H2(g) + I2(s) → 2 HI (g)Use the bond enthalpies in the table to estimate ΔH for this reaction, ignoring the fact that iodine...

Solved • Oct 31, 2018

Bond Energy

Q. The nitrogen atoms in an N2 molecule are held together by a triple bond; use enthalpies of formation in Appendix C to estimate the enthalpy of this...

Solved • Oct 31, 2018

Bond Energy

Q. Consider the reaction between hydrazine and hydrogen to produce ammonia, N2H4(g) + H2(g) → 2 NH3(g). Use enthalpies of formation and bond enthalpie...

Solved • Oct 31, 2018

Bond Energy

Q. (a) The nitrogen atoms in an N2 molecule are held together by a triple bond; use enthalpies of formation in Appendix C to estimate the enthalpy of ...

Solved • Oct 31, 2018

Bond Energy

Q. Consider the reaction: 2 H2(g) + O2(g) → 2 H2O(l). Use the bond enthalpies in the table to estimate ΔH for this reaction, ignoring the fact that wa...

Solved • Oct 31, 2018

Bond Energy

Q. Use bond enthalpies in the table below to estimate ΔHrxn for each of the following reactions.Average Bond Enthalpies (kJ/mol)C-H 413N-H 391O-H 463F...

Solved • Oct 31, 2018

Bond Energy

Q. Hydrogen cyanide can be catalytically reduced with hydrogen to form methylamine. Use Lewis structures and bond energies to determine ΔH°rxn for HCN...

Solved • Oct 28, 2018

Bond Energy

Q. Hydrazine (N2H4) is used as a rocket fuel because it reacts very exothermically with oxygen to form nitrogen gas and water vapor. The heat released...

Solved • Oct 28, 2018

Bond Energy

Q. Oxalic acid (H2C2O4) is found in toxic concentrations in rhubarb leaves. The acid forms two ions, HC2O4− and C2O42−, by the sequential loss of H + ...

Solved • Oct 28, 2018

Bond Energy

Q. Ethanol (CH3CH2OH) is being used as a gasoline additive or alternative in many parts of the world.(d) “Greener” methods produce ethanol from corn a...

Solved • Oct 28, 2018

Bond Energy

Q. In the 1980s, there was an international agreement to destroy all stockpiles of mustard gas, ClCH2CH2SCH2CH2Cl. When this substance contacts the mo...

Solved • Oct 28, 2018

Bond Energy

Q. “Inert” xenon actually forms several compounds, especially with the highly electronegative elements oxygen and fluorine. The simple fluorides XeF2,...

Solved • Oct 28, 2018

Bond Energy

Q. Dimethyl ether (CH 3OCH3) and ethanol (CH 3CH2OH) are constitutional isomers (see the following Table).(c) Calculate ΔH°rxn for the conversion of e...

Solved • Oct 24, 2018

Bond Energy

Q. Dimethyl ether (CH 3OCH3) and ethanol (CH 3CH2OH) are constitutional isomers (see Table 3.3).(b) State which reaction is more exothermic.

Solved • Oct 24, 2018

Bond Energy

Q. Dimethyl ether (CH 3OCH3) and ethanol (CH 3CH2OH) are constitutional isomers (see Table 3.3).(a) Use following table to calculate ΔH°rxn for the fo...

Solved • Oct 24, 2018

Bond Energy

Q. The average C—H bond energy in CH4 is 415 kJ/mol. Use following table and the following data to calculate the average C—H bond energy in ethane (C2...

Solved • Oct 24, 2018

Bond Energy

Q. There are two main types of covalent bond breakage. In homolytic breakage (as in following Table), each atom in the bond gets one of the shared ele...

Solved • Oct 24, 2018

Bond Energy

Q. There are two main types of covalent bond breakage. In homolytic breakage (as in following Table), each atom in the bond gets one of the shared ele...

Solved • Oct 24, 2018

Bond Energy

Q. The HF bond length is 92 pm, 16% shorter than the sum of the covalent radii of H (37 pm) and F (72 pm). Suggest a reason for this difference. Simil...

Solved • Oct 24, 2018

Bond Energy

Q. Without stratospheric ozone (O3), harmful solar radiation would cause gene alterations. Ozone forms when the bond in O2 breaks and each O atom reac...

Solved • Oct 24, 2018

Bond Energy

Q. Gases react explosively if the heat released when the reaction begins is sufficient to cause more reaction, which leads to a rapid expansion of the...

Solved • Oct 23, 2018

Bond Energy

Q. Gases react explosively if the heat released when the reaction begins is sufficient to cause more reaction, which leads to a rapid expansion of the...

Solved • Oct 23, 2018

Bond Energy

Q. Acetylene gas (ethyne; HC≡CH) burns in an oxyacetylene torch to produce carbon dioxide and water vapor. The enthalpy of reaction for the combustion...

Solved • Oct 23, 2018

Bond Energy

Q. The energy of the C—C bond is 347 kJ/mol, and that of the Cl—Cl bond is 243 kJ/mol. Which of the following values might you expect for the C—Cl bon...

Solved • Oct 23, 2018

Bond Energy

Q. Sports trainers treat sprains and soreness with ethyl bromide. It is manufactured by reacting ethylene with hydrogen bromide:Use bond energies to f...

Solved • Oct 23, 2018

Bond Energy

Q. An important industrial route to extremely pure acetic acid is the reaction of methanol with carbon monoxide:Use bond energies to calculate the ent...

Solved • Oct 23, 2018