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Exam 1 ReviewBe sure to bring the following:•Stony Brook ID card•2 or more #2 pencils and a good eraser•Scientific calculator with spare batteriesDO NOT BRINGa text, notes, or any aids to taking the examAll electronic devices must be powered off and out of sightViolations may result in a course grade of F and a report tothe Academic Judiciary.No one will be permitted to leave the exam before 9:30 PM.CHE 131 Exam 1, Fall 2016Wednesday September 21st, 8:45 – 10:15 PMSolar IDRoom000000000 – 110490342Javits 100 Main Floor110490343 – 110786975Javits 100 Balcony110786976 – 110918185Frey 100110918186 – 110987389Javits 102110987390 – 111045848Javits 110111045849 – 111089091Harriman Hall 137111089092 – 111115332Humanities 1003111115333 – 111158531Humanities 1006111158532 – 111184244Javits 101111184245 – 111204566Javits 103111204567 – 999999999Javits 109CHE 131 Exam 1, Fall 2016Wednesday September 21st, 8:45 – 10:15 PM•You are given a periodic table•All multiple choice.•25 questions + 1 bonus (4 points each)•Some conceptual, some numerical•A few have multiple steps and take time•Point value same regardless of difficulty!•Budget your time carefully•Includes everything up to and including lecture #8•The past semesters have different lecture schedule sothe practice exams covers more materials.•You should review relevant topics (chapter 1-3)inpractice examsJiangyong Jia;Che 131, Fall 2015Info for Exam #1
Chemical Changesvs. Physical ChangeChemical Propertiesvs. Physical PropertiesIntensive propertyvs. Extensive propertyChanges and propertiesMatter ClassificationMATTER(Diff. States)Can it be physicallyseparated?HomogeneousMixture(solution)HeterogeneousMixtureCompoundElementMIXTUREPURE SUBSTANCEyesnoCan it be chemicallydecomposed?noyesIs the compositionuniform?noyesGoodaccuracyGoodprecisionPooraccuracyGoodprecisionPooraccuracyPoorprecisionAccuracy vs. Precision}Accuracy can be true of an individual measurement or the averageof several}Precision requires several measurements before anything can besaid about itSuppose a length measurement: = 4.670 cm, 4.675 cm, 4.678 cm,Truth is 4.95 cm.Significant Figures}Counting Sig Figs◦Count all numbers EXCEPT:Leading zeros -- 0.0025Trailing zeros withouta decimal point -- 2,5001.23.502.4023.5,2804.0.0804 sig figs3 sig figs3 sig figs2 sig figsExact Numbersdo not limite # of sig figs.Counting numbers: 12 studentsExact conversions: 1 m = 100 cm“1” in any conversion: 1 in = 2.54 cmExamples
Calculating with significant figures}Calculating with Sig Figs◦Multiply/Divide- The # with the fewest sig figsdetermines the # of sig figs in the answer.(13.91g/cm3)(23.3cm3) = 324.103g324 g4 SF3 SF3 SFRounding0.1-0.4 round to 00.5-0.9 round to 13.75 mL+ 4.1mL7.85 mLCalculating with significant figures}Calculating with Sig Figs (con’t)◦Add/Subtract- The # with the lowest decimal valuedetermines the place of the last sig fig in the answer.3.75 mL+ 4.1