Standard Science Primary 5 Cycles

Sara poured hot water into a glass cup and covered it with a cold metal plate. After a few minutes, she observed water droplets forming. Where did the water droplets form and why?

A On the top of the metal plate, because cold water vapor gained heat.
B On the underside of the metal plate, because hot water vapor lost heat.
C On the outer surface of the cup, because water vapor lost heat.
D On the inner surface of the cup, because water vapor gained heat.
Show Worked Solution

Worked Solution

Step 1: Hot water evaporates into warm water vapor inside the cup. Step 2: The warm water vapor rises and touches the cooler underside of the metal plate. Step 3: The vapor loses heat to the cool plate and condenses into water droplets.

Correct answer: On the underside of the metal plate, because hot water vapor lost heat.

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