CHEM 101 LAB FINAL EXAM QUESTIONS WITH CORRECT ANSWERS

CHEM 101 LAB FINAL EXAM QUESTIONS
WITH CORRECT ANSWERS
WhenBshouldByouBNOTBwearBglovesBinBtheBlabBsetting?

a.BWhenBweighingBourBreagentsBatBtheBbalances

b.BWhenBenteringBinBdataBonByourBlaptop

c.BWhenBhandlingBcleanBglassware

d.BWhenBwritingBnotesBonBscratchBpaperBusingBaBpenBandBpaperB-BCORRECTBANSWERB-bBandBdB

*alsoBshouldBnotBwearBglovesBwhenBopeningBdoors



GeneralBgloveBrulesB-BCORRECTBANSWERB--ByouBshouldBneverBreuseBgloves

-BdisposeBofBglovesBifBtheyBareBheavilyBcontaminated

-BdisposeBofBglovesBifBtheyBareBtorn

-BdisposeBofBglovesBinBtheBgloveBhazardousBwasteBcontainer

-BglovesBmustBbeBwornBatBallBtimesBwhileBhandlingBchemicalsBorBglassware

-BdoBnotBwearBglovesBoutsideBofBlab



YouBmakeBaBsolutionBofB0.1MBNaOHBandBaccidentallyBspillBtheBsolution,BcoveringByourBglovedBhan
dBandBontoByourBarm.BYourBwristBwasBexposed,BandBtheBsolutionBcameBintoBdirectBcontactBwithByo
urBskin.BWhatBshouldByouBdo?B-BCORRECTBANSWERB-
letByourBTABknowBandBwashByourBskinBunderBrunningBwaterBforBatBleastB15Bminutes



WhenBshouldBgogglesBbeBwornBinBlab?B-BCORRECTBANSWERB-TheBwholeBtimeByouBareBinBlab



YouBareBtakingBanBeveningBlaboratoryBsessionBandBwantBtoBbringBaBsnackBtoBhelpByouBmakeBitBthou
ghBtheBevening.BWhenBshouldByouBbeBallowedBtoBhaveBfoodBatBtheBbenchBtopBinBtheBlab?B

a.BIfBtheBexperimentalBworkBisBoverBandBcleanedBup

, b.BAtBtheBbeginningBbecauseBitBisBdinnerBtimeBandBbeingBaBstudentBisBexhausting.B

c.BOnlyBifBtheBfoodBremainsBinBtheBstudentsBbackpackBwhileBatBtheBbenchBtop.B

d.BNever.B

e.BNever,BunlessByouBhaveBaBtendencyBtoBbecomeBhypoglycemic,BthenByouBareBallowedBtoBeatBatBt
heBbenchBtoBpreventBhealthBissues.B-BCORRECTBANSWERB-d.BNever



AccuracyB-BCORRECTBANSWERB-
ABmeasureBofBhowBcloseBaBmeasurementBisBtoBtheBtrueBvalueBofBtheBquantityBmeasured.



PrecisionB-BCORRECTBANSWERB-
ABmeasureBofBhowBcloseBaBseriesBofBmeasurementsBareBtoBoneBanother.



SystematicBerrorBarisesBfromBaBflawBinBtheBequipmentBorBinBtheBexperimentalBdesign.BThisBtypeBofB
errorBcanBbeBdetectedBandBcorrected.BItBleadsBtoBpredictableBresults.BProvideBseveralBexamples.B-
BCORRECTBANSWERB--


BaBscaleBthatBisBimproperlyBcalibratedBandBalwaysBreadsB2.3BgramsBheavierBthanBtheBobjectBactuall


yBis

-BaBstretchedBoutBmeasuringBtapeBthatBalwaysBreadsBvaluesBlowerBthanBtheBtrueBvalue.



RandomBerrorBarisesBfromBuncontrolled,BoftenBuncontrollable,BvariablesBinBanBexperimentBwhichB
hasBequalBchanceBofBbeingBpositiveBandBnegative.BThisBtypeBofBerrorBcannotBbeBdetectedBorBcorrec
tedBfor.BItBleadsBtoBunpredictableBresults.BResultsBwillBlikelyBclusterBaroundBtrueBvalue.BProvideBsev
eralBexamples.B-BCORRECTBANSWERB--
BwindBspeedBmightBspeedBupBorBslowBdownBatBunpredictableBtimes



-
BanyBmeasurementBbetweenB2BmarkingsBbecauseBdifferentBpeopleBwillBreadBtheBmeasurementBdif


ferently



EXPB1:BWhyBdoesBiceBfloatBinBwater?B-BCORRECTBANSWERB-
IceBisBlessBdenseBthanBwaterBbecauseBtheBnegativelyBchargedBoxygenBatomsBrepelBoneBanotherBdu
eBtoBHydrogenBbonding.BAfterB4BCB(40BF),BwaterBbeginsBlosingBdensity.