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PSU CHEM 110 - EXAM REVIEW

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Exam 2 ReviewConcept: Chemical FormulasConcept: Organic CompoundsOrganic ChemistryMolecular AnalysisChemical AnalysisConcept: Molecular GeometryMolecular GeometryPolarityHybrid OrbitalsConcept: Bond TypesBond TypesIntermolecular ForcesIntermolecular ForcesIntermolecular ForcesCombustion Analysis!Exam 2 Concepts You Should Know:Exam 2 ReviewCH110 FA11 SAS 1Monday, October 10, 6:30 PM - 7:45 PMThe same Data Sheet from the packet, a periodic table and scratch paper will be provided for youBring:#2 pencils, PSU photo ID, calculator - may not be text programmableKnow:Your Chem 110 section number, and your PSU student ID numberDo NOT bring:Cell phones, PDA's, or any other electronic devicesDO Wear hats with a brim backwardsKeep bags and backpacks ZIPPED AND ON THE FLOORMaterial Covered: Lectures 1-11 (Chapters 1-3, 5-7, 8.1-8.8), ALEKS Objectives 1-4Format: 28 Multiple choice questions, some calculations, some concept questionsA 100% Score earns 34 points out of 200 course points (17% of final grade)Concept: Chemical FormulasCH110 FA11 SAS 2Chemists have a variety of means to describe compounds:• Molecular Formula: Chemical formula with subscripts of the _____________number of atoms in each molecule• Empirical Formula: Chemical formula with subscripts of the _____________number of atoms in each molecule• Formula Weight: Sum of ___________of each atom in the chemical formula• Molar Mass: The mass of ___________of molecules having a given chemical formula (calculated from ___________ )• Mass Percentage: The percent mass of a ____________ in a compoundConcept: Organic CompoundsCH110 FA11 SAS 3We learned about chemical formulas with a unit on organic chemistry:• Hydrocarbons contain only ________• Four types of hydrocarbons:alkanes have ____________________alkenes have ____________________alkynes have ____________________aromatics have __________________• Many organic compounds have isomers with the same ___________but different _____________________• Functional groups: Additional atoms define a molecules _________ and especially _________Organic ChemistryCH110 FA11 SAS 4Which of the following molecules are structural isomers?Molecular AnalysisCH110 FA11 SAS 5A sample weighing 127.3 mg contained 2.12 mmol. Identify the sampleChemical AnalysisCH110 FA11 SAS 6What is the formula weight of the compound shown below?Concept: Molecular GeometryCH110 FA11 SAS 7Structural FormulaValence e-Lewis structurese-domainsVs.Bonding domainsMolecular geometryIdentify polar bondsMolecular polarityMolecular GeometryCH110 FA11 SAS 8What is the molecular geometry of:PolarityCH110 FA11 SAS 9Which of these molecules is polar:Hybrid OrbitalsCH110 FA11 SAS 10What is the hybridization found in the central atom of:Concept: Bond TypesCH110 FA11 SAS 11A pi bond is stronger than a sigma bondA. TrueB. FalseAll covalent molecules contain at least one pi bond.A. TrueB. FalseSigma bonds are symmetric and allow free rotation about the internuclear axis.A. TrueB. FalseA molecule with resonance exhibits increased stability.A. TrueB. FalseBond TypesCH110 FA11 SAS 12How many sigma and pi bonds are there in the following molecule?Intermolecular ForcesCH110 FA11 SAS 13Energy is required to break intermolecular forces.A. TrueB. FalseList the phases of mater in order of increasing kinetic energy.A. Gas < Liquid < SolidB. Liquid < gas < SolidC. Solid < Liquid < GasIntermolecular forces increase with increases in temperature.A. TrueB. FalseIntermolecular ForcesCH110 FA11 SAS 14What intermolecular forces must be overcome to allow the following molecule to boil:Intermolecular ForcesCH110 FA11 SAS 15Which molecule will have the higher boiling point?Combustion Analysis!CH110 FA11 SAS 16Combustion of 7.75 mg of vitamin C, which contains only C, H, and O, gives 11.62 mg CO2and 3.17 mg H20. Its molar mass is between 150 and 200 g/mol. What is its molecular formula?Exam 2 Concepts You Should Know:CH110 FA11 SAS 17• How do we determine the composition of a compound from the various chemical formulas?• What is combustion analysis?Chapter 3: Chemical Formulas AgainChapter 25: Organic MoleculesChapter 9: Bonding and Geometry• What are the properties of hydrocarbons?• What do the functional groups we learned about look like and how do they affect properties?• What are the shapes of the electron domain and molecular geometries we have studied?• What is molecular polarity and how is it determined by shape?• What are sigma and pi bonds?• How do hybrid orbitals relate to molecular shape and bond angles?• What are the IMFs we have learned about?• How do IMFs impact boiling and melting points?Chapter 11: Intermolecular


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PSU CHEM 110 - EXAM REVIEW

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