AP Chemistryhardmcq1 pt
A liquid boils when its vapor pressure
A.equals the external pressure
B.equals zero
C.exceeds the critical pressure
D.is at its minimum
Explanation
Core Concept
Boiling happens when vapor bubbles can form and push against the atmosphere. At that point vapor pressure balances external pressure — why water boils below 100 °C on mountains.
Correct Answer
Aequals the external pressure
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