Question

exam lesson name: states of matter
exam number: 700698rr
exam guidelines
exam instructions
question 14 of 20 :
select the best answer for the question.

1. when the rate of evaporation and the rate of condensation at the surface of a liquid are the same, the liquid is at its

a. critical tension.
b. saturation point.
c. ignition point.
d. critical temperature.
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Explanation:

To solve this, we analyze each option:

• Option A: Critical tension is not related to evaporation - condensation equilibrium.
• Option B: Saturation point (or equilibrium) occurs when evaporation and condensation rates are equal at a liquid's surface.
• Option C: Ignition point is about combustion, not phase change equilibrium.
• Option D: Critical temperature is the temperature above which a gas can't be liquefied, not about evaporation - condensation balance.

Answer:

B. saturation point.