CHEM 120 / CHEM120
Exam 3 — Enhanced Study Guide
Introduction to General, Organic & Biological Chemistry
Original Q&A • Worked Problems • Formulas • Organic Chemistry • Radioactivity • Acids/Bases
• Exam Traps
This guide is an independently written study resource inspired by the public preview and metadata of the referenced Stuvia
listing. The listing identifies a 21-page Exam 3 Q&A resource uploaded January 28, 2025; its public preview includes
half-life calculations and positron-emission concepts. This guide does not reproduce or reconstruct paid/locked text.
Use your course materials and instructor guidance as the authoritative source for graded work.
CHEM120 Exam 3 — Original Enhanced Study Guide Page 1
, Exam 3 Master Map
High-yield areas to master: radioactive decay and half-life; nuclear equations and radiation types; energy and chemical
reactions; organic functional groups and hydrocarbon naming; properties of alkanes, alkenes, and alkynes; alcohols,
carboxylic acids, esters and amines; biomolecules; acids, bases, pH and neutralization; and biochemical connections
relevant to healthcare.
Fast diagnostic rule: When a problem looks complicated, identify the category first: calculation, naming, structure
recognition, reaction classification, or biological application.
Formula Sheet
Half-life: remaining amount = initial amount × (1/2)n, where n = elapsed time ÷ half-life.
pH = −log[H+].
pOH = −log[OH−].
At 25°C, pH + pOH = 14 and Kw = 1.0 × 10−14.
Neutralization: acid + base → salt + water (for a strong acid/strong base example).
CHEM120 Exam 3 — Original Enhanced Study Guide Page 2
, CHEM120 Exam 3 — Original Enhanced Study Guide Page 3
Exam 3 — Enhanced Study Guide
Introduction to General, Organic & Biological Chemistry
Original Q&A • Worked Problems • Formulas • Organic Chemistry • Radioactivity • Acids/Bases
• Exam Traps
This guide is an independently written study resource inspired by the public preview and metadata of the referenced Stuvia
listing. The listing identifies a 21-page Exam 3 Q&A resource uploaded January 28, 2025; its public preview includes
half-life calculations and positron-emission concepts. This guide does not reproduce or reconstruct paid/locked text.
Use your course materials and instructor guidance as the authoritative source for graded work.
CHEM120 Exam 3 — Original Enhanced Study Guide Page 1
, Exam 3 Master Map
High-yield areas to master: radioactive decay and half-life; nuclear equations and radiation types; energy and chemical
reactions; organic functional groups and hydrocarbon naming; properties of alkanes, alkenes, and alkynes; alcohols,
carboxylic acids, esters and amines; biomolecules; acids, bases, pH and neutralization; and biochemical connections
relevant to healthcare.
Fast diagnostic rule: When a problem looks complicated, identify the category first: calculation, naming, structure
recognition, reaction classification, or biological application.
Formula Sheet
Half-life: remaining amount = initial amount × (1/2)n, where n = elapsed time ÷ half-life.
pH = −log[H+].
pOH = −log[OH−].
At 25°C, pH + pOH = 14 and Kw = 1.0 × 10−14.
Neutralization: acid + base → salt + water (for a strong acid/strong base example).
CHEM120 Exam 3 — Original Enhanced Study Guide Page 2
, CHEM120 Exam 3 — Original Enhanced Study Guide Page 3
