Drawing Lewis Structures And Correlating With Bond Orders .

CHEM 200Discussion Worksheet TenSpring 2020Instructions for Working out the Worksheets:Work in groups of 4 on these problems. You should try to answer the questions without referringto your textbook. If you get stuck, try asking another group for help. Your TA will come aroundwhen needed to help guide you if needed.Round Robin Instructions:1. Each group member will be assigned a number, starting with #1 and ending with the numberof people in the group.2. Student #1 will read the question aloud and define the information needed to solve theproblem, create an outline on how you can solve the problem.3. When the group agrees that the necessary information is complete, student number two willdo the first step. When the group agrees that the step is correct, student number three willdo the next step. Continue this way until the group agrees that the given answer had beencorrectly drawn and identified.4. Student #2 will start the next question by reading it aloud as in #1. Follow this pattern for allthe questions in the session.CHEM 200Discussion Worksheet TenSpring 2016Topics being Covered in the Worksheet:1. Lewis Structures4. PolarityDrawingLewis Structuresand2. Bond Order, Bond Length,and Bond5. VSEPREnergies6. FormalandChargesCorrelatingwith Bond Orders, Bond Lengths,Bond Energies3. Enthalpy Change via Bond EnergyComplete the Lewis structures for the compounds shown in the following table and1.answerCompletethe tablequestionson thewhichother willside.go over topics 1 and 2. Using the covalent radii table.MoleculeLewis StructureBondofBond BondInterest Order 64H3CCH3C-C346H2CCH2C-C615HCCHC-C8351 of 5CO2C-O804

H2OO-H and464Drawing Lewis StructuresCorrelating with Bond Orders,Bond Lengths, and Bond EnergiesSpring 2020CHEM 200Discussion Worksheet TenH3CCHtheC-Cin the following table and346Complete3 Lewis structures for the compounds shownanswer questions on the other side.BondC-CofBond BondInterest Order LengthH2CCH2MoleculeLewis StructureH2HCCHC-CH-HCHEM 200CHEM 200835436Discussion Worksheet TenDiscussion Worksheet TenCOCl22Spring 2016Spring 2016C-OCl-ClBond EnergyHH22COOEnergy 16-2BondChemWorksheetC-OO-HChem Worksheet 16-2Bond615Energy(kJ/mol)804243Name799464NameBond energy is defined as the amount of energy required to break a bond. These valuesare positive,indicatingthat bondbreakingBondare reportedinBond energyis definedas theamountisofendothermic.energy requiredto energiesbreak a bond.These valueskilojoulesThe breakingenergy foris breakinga hydrogen-hydrogenis 436N2perindicatingare Hpositive,that bondendothermic.BondN-Nenergies arebondreportedinC-C3CCH3mole (kJ/mol).kJ/molso whena hydrogen-hydrogenbondformed theprocess releases 436bondkJ/mol.kilojoulesper mole(kJ/mol). The energyforisbreakinga hydrogen-hydrogenis 436In a sochemicalseveral bondsare isbrokenandexamplethekJ/molwhen a ssForreleases436inkJ/mol.reactiona hydrogen-hydrogenbondareis broken and formed.a fluorine-fluorinebondis broken.In a belowchemicalreaction several bondsFor examplein theTwohydrogen-fluorinebonds are formed.Theoverallandenergychange for ndisbrokenafluorine-fluorineis broken.O2 2H2CCHO-OC-Ccalculatedbelow.Two hydrogen-fluorinebonds are formed. The overall energy change for this process iscalculatedexamplebelow.H2 (g) F2 (g) ! 2HFexampleH2 (g) F2 (g) ! 2HF"Hrxn [energy used for breaking bonds] – [energy formed in making bonds]HCCHC-C"Hrxn [energy usedfor breakingformed in making bonds][436 kJ/mol 155 bonds]kJ/mol]––[energy[2(567 kJ/mol)]H H945346 H HBond energy: 436 kJ/molBond energy: 436 kJ/molF FF FBond Energy: 155 kJ/molBond Energy: 155 kJ/mol498615H FH FBond Energy: 567 kJ/molBond Energy: 567 kJ/mol835Pageof 14[436 kJ/molkJ/mol]– [2(567kJ/mol)]2. In the following problemsyou willbesolvingmathematicalproblems to helpyou 1understand 155– 543kJ/mol – 543 kJ/moltopic 3. Make sure you have the correctsignificant figures for each �HH–FN–ON–HO–HN–OO–OO–HF–FN2 O–OF–F436 kJ/mol431436 kJ/molkJ/mol567431 kJ/molkJ/mol391567 kJ/molkJ/mol201391 kJ/molkJ/mol463201 kJ/molkJ/mol146463 kJ/molkJ/mol155146 kJ/molkJ/mol155 kJ/molAverage Bond Energies (kJ/mol)AverageBond EnergiesC–H413 3 kJ/molkJ/mol293348 kJ/molkJ/molC-O358293 kJ/molkJ/mol485kJ/mol358 kJ/mol328485 kJ/molkJ/mol259328 kJ/molkJ/mol242259 kJ/molkJ/molN-N242 kJ/molC CC!CC CC OC!CO OC OC!OO OC NC!ON NC NN!NN NC!NN!NC!N614 kJ/mol839614 kJ/molkJ/mol799839 kJ/molkJ/mol799495799 kJ/molkJ/mol1072kJ/mol495 kJ/mol615 kJ/mol1072kJ/mol418615 kJ/molkJ/mol941418 kJ/molkJ/mol945891941 kJ/molkJ/mol891 kJ/molEstimate the enthalpy change (!Hrxn) of the following reactions using the bond energies above.O2 the enthalpy change (!Hrxn) of the following reactionsO-O498 above.Estimateusing the bond energies!!1.1.H H Cl ClH H Cl ClH Cl H ClH Cl H Cl2.2.HH F FC CHHHH F FC CHH3.3.HHH CH O H H CH O HH HC O H H HC O HHH!!H HH CH CH HH FC FC HF!!FHH CH OH HC OHOCO Cl H ClC Cl H ClCl4.4.ClCl Cl OH CH ClC Cl O5.5.ClClHO OH O H 1 of 14H CH H O C OPageO OO!OO HHHH OH HC H ! O C O H O HO OH!!HCH H H O HC H H O HHHDraw Lewis structures for reactants and products. Estimate the enthalpy change (!Hrxn) for thereactionsusingbond energies.Draw Lewisstructuresfor reactants and products. Estimate the enthalpy change (!Hrxn) for thereactions using bond energies.6. H2 (g) CO2 (g) " H2O (g) CO (g)10. H2 (g) C2H4 (g) " C2H6 (g)2 of 5

CHEM 200Discussion Worksheet TenCHEM 200Discussion Worksheet TenPolarity WorksheetSpring 2016Spring 20203. In the following problems you will be determining which is most polar and explain theFor eachof thefollowingof molecules,determine which is most polar andreasoningfor thechoice,to helppairsyou understandtopic 4.explain your reason for making this choice:1)carbon disulfideORsulfur difluoride2)nitrogen trichlorideORoxygen dichloride3)boron trihydrideORammonia4)chlorineORphosphorus trichloride5)silicon dioxideORcarbon dioxide6)methaneORCH2Cl27)silicon tetrabromideORHCN8)nitrogen trifluorideORphosphorus trifluoride3 of 5For chemistry help, visit www.chemfiesta.com 2007 Cavalcade Publishing; All Rights Reserved

CHEM 200Discussion Worksheet TenSpring 20204. In the following problems draw and name the Lewis structure and VSPR structure of thefollowing. This will help with topics 1 and 6.MoleculesLewis Structure & NameVSEPR Structure & NameFormalCharge ofCentral AtomH2CSN2O5BF3NO2-CCl4PF5ICl3XeF24 of 5

CHEM 200MoleculesDiscussion Worksheet TenLewis Structure & NameVSEPR Structure & NameSpring 2020FormalCharge ofCentral AtomClF5SF6XeF4BrF5XeCl3-C 2H 6OC 6H 6(C’s form aring)CH2O5 of 5

4. In the following problems draw and name the Lewis structure and VSPR structure of the following. This will help with topics 1 and 6. Molecules Lewis Structure & Name VSEPR Structure & Name Formal Charge