Exam 3: Chem120/ Chem 120 (New 2025/ 2026 Update) Introduction to General, Organic & Biological Chemistry |Questions & Answers| Grade A| 100% Correct (Verified Solutions)- Chamberlain

Examl3:lChem120/lCheml120l(Newl2025/l
2026lUpdate)lIntroductionltolGeneral,l
Organicl&lBiologicallChemistryl|lQsl&lAs|l
GradelA|l100%lCorrectl(VerifiedlAnswers)-
lChamberlainl
QUESTION
Howlmanylhalf-
liveslwouldloccurlafterl30lminutesliflalradioactivelmateriallhaslalhalf-
lifelofl10lminutes?


Answer:
3lHalfllives

HL=l10lminutesl(10lxl3l=l30)




QUESTION
Al60lgramlsampleloflalradioactivelmateriallhaslalhalf-lifelofl5lyears.
Afterl10lyears,lhowlmanylgramslofltheloriginallradioactivelmateriallwilllremain?


Answer:
60lgrams;lwilllundergol2lhalflliveslsincel
10/5=l2
1stlHalflLife:l30lgrams
2ndlHalflLife:l15lgrams

15lgramslwilllremain

,QUESTION
Whenlpolonium-255ldecayslbylpositronlemission,lwhatlislthelproduct?


Answer:
Atomiclnumberldecreaseslbyl1l(atomicl#loflPolisl84,lsol84-1=l83)
Nolchangeltolatomiclmass

Bismuth-225l(hasl83laslatomiclnumber)




QUESTION
Whichloflthelfollowinglarelexamplesloflproteins?

Selectlalllthatlapply

-lAntibodies
-lEnzymes
-lDNA
-lRNA


Answer:
Antibodieslandlenzymesl(DNA/RNAlarelnucleiclacids)




QUESTION
Chooselthelcarbohydratelthatlislclassifiedlaslalpolysaccharide.

, Answer:
Starch




QUESTION
Whichloflthelfollowinglmoleculeslparticipatelinlthelformationloflalfattylester?

Selectlalllthatlapply.

Sucrose
Aminolacids
Fattylacids
Glycerol


Answer:
Fattylacidslandlglycerol




QUESTION
Iflallipidlislclassifiedlaslalfat,lIlwouldlexpectlitlto:l(selectlalllthatlapply)

-lHavelalstructurelnotlcontaininglC=Cldoublelbonds
-lBelalsolidlatlroomltemperature
-lHavelalstructurelcontaininglC=Cldoublelbonds
-lBelalliquidlatlroomltemperature


Answer:
-HavelalstructurelnotlcontaininglC=Clbonds
-lBelsolidlatlroomltemperature