Standard Science Primary 4 Energy

Look at the two cups of water. Cup A contains water at 80°C and Cup B contains water at 10°C. They are left on a table in a room with a temperature of 30°C. What will happen to the temperature of the water in both cups after 2 hours?

A Cup A: Increases, Cup B: Decreases
B Cup A: Stays 80°C, Cup B: Stays 10°C
C Cup A: Decreases, Cup B: Increases
D Cup A: Decreases, Cup B: Decreases
Show Worked Solution

Worked Solution

Step 1: Heat flows from a hotter region to a cooler region. Step 2: Cup A (80°C) is hotter than the room (30°C), so it loses heat and its temperature decreases. Step 3: Cup B (10°C) is cooler than the room, so it gains heat from the room and its temperature increases.

Correct answer: Cup A: Decreases, Cup B: Increases

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