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

Chem120/l Cheml 120l Examl 3:l
Introductionl tol General,l Organicl &l
Biologicall Chemistryl (Latestl 2025/l 2026l
Update)l |l Qsl &l As|l Gradel A|l 100%l
Correctl (Verifiedl Answers)-l Chamberlainl
QUESTION
Whichl ofl thel followingl arel examplesl ofl proteins?

Selectl alll thatl apply

-l Antibodies
-l Enzymes
-l DNA
-l RNA


Answer:
Antibodiesl andl enzymesl (DNA/RNAl arel nucleicl acids)




QUESTION
Choosel thel carbohydratel thatl isl classifiedl asl al polysaccharide.


Answer:
Starch

,QUESTION
Whichl ofl thel followingl moleculesl participatel inl thel formationl ofl al fattyl
ester?

Selectl alll thatl apply.

Sucrose
Aminol acids
Fattyl acids
Glycerol


Answer:
Fattyl acidsl andl glycerol




QUESTION
Howl manyl half-livesl wouldl occurl afterl 30l minutesl ifl al radioactivel
materiall hasl al half-lifel ofl 10l minutes?


Answer:
3l Halfl lives

HL=l 10l minutesl (10l xl 3l =l 30)




QUESTION
Al 60l graml samplel ofl al radioactivel materiall hasl al half-lifel ofl 5l years.
Afterl 10l years,l howl manyl gramsl ofl thel originall radioactivel materiall willl
remain?

, Answer:
60l grams;l willl undergol 2l halfl livesl sincel
10/5=l 2
1stl Halfl Life:l 30l grams
2ndl Halfl Life:l 15l grams

15l gramsl willl remain




QUESTION
Whenl polonium-255l decaysl byl positronl emission,l whatl isl thel product?


Answer:
Atomicl numberl decreasesl byl 1l (atomicl #l ofl Pol isl 84,l sol 84-1=l 83)
Nol changel tol atomicl mass

Bismuth-225l (hasl 83l asl atomicl number)




QUESTION
Ifl al lipidl isl classifiedl asl al fat,l Il wouldl expectl itl to:l (selectl alll thatl apply)

-l Havel al structurel notl containingl C=Cl doublel bonds
-l Bel al solidl atl rooml temperature
-l Havel al structurel containingl C=Cl doublel bonds
-l Bel al liquidl atl rooml temperature


Answer:
-Havel al structurel notl containingl C=Cl bonds