Question

your class is studying phase change and kinetic energy. as part of a demonstration, your teacher walks up to the window and exhales, making the drawing you see here. she asks: \how can you describe the condensation on the window in terms of molecular movement?\ read the choices in the prompt. which statement should not be included in your explanation?
a. the teacher’s breath contains water vapor, a gas.
b. as the gas leaves the teacher’s mouth, the temperature drops.
c. condensation occurs only when there is a drop in temperature.
d. kinetic energy decreases with a decreases in the temperature of a gas.
e. fast moving gas molecules slow down with an increase in pressure.
f. the water vapor hits the window, slows down, is pushed together and condenses.

Explanation:

To solve this, we analyze each option:

• Option A: Teacher's breath has water vapor (gas) – correct for context.
• Option B: Gas leaving mouth cools – correct as breath meets cooler window.
• Option C: Condensation needs temperature drop – incorrect, condensation occurs when gas cools (temperature drop or pressure change), not "only" temperature drop. Other factors like pressure can cause it.
• Option D: Kinetic energy decreases with temperature drop (gas) – correct, as temp drops, KE of gas molecules decreases.
• Option E: Fast gas molecules slow with pressure increase – in this case, cooling (temp drop) causes slowing, but pressure increase can also slow molecules, but the main factor here is temperature. However, the question is which statement should NOT be included. Option C is incorrect because condensation isn't limited to only temperature drop (pressure changes can also cause it). Wait, re - evaluating: The question is about describing condensation on the window. Let's re - check each option's validity for the explanation:
• Option A: Correct, breath has water vapor (gas).
• Option B: Correct, as gas (breath) leaves mouth, it hits cooler window (temp drop).
• Option C: Says "Condensation occurs only when there is a drop in temperature." But condensation can occur with pressure increase too (e.g., compressing a gas). So this statement is incorrect and should not be included.
• Option D: Correct, kinetic energy of gas is related to temperature, so temp drop → KE decrease.
• Option E: The water vapor (gas) hits window, slows (due to cooling, but pressure increase can also slow), and condenses. But the main process here is cooling (temp drop), but the statement about pressure increase slowing is not the main factor here, but is it incorrect? Wait, the key is which statement is wrong. Option C is wrong because condensation isn't "only" due to temperature drop.
• Option F: Water vapor hits window, slows, condenses – correct.

So the statement that should not be included is Option C as it incorrectly limits condensation to only temperature drop.

Answer:

C. Condensation occurs only when there is a drop in temperature.