OSTP Science Grade 5 Practice Questions - Oklahoma School Testing Program - Science, Grade 5 Exam

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A teacher places three spoons made of different materials—metal, wood, and plastic—into a bowl of hot soup (85°C). Small dots of butter are stuck to the top handle of each spoon outside the bowl. After 3 minutes, the butter on the metal spoon melts completely, while the butter on the wooden and plastic spoons remains solid. What does this investigation demonstrate about thermal conductivity?

Metal is a good thermal conductor that transfers heat energy rapidly, while wood and plastic are poor thermal conductors. Wood and plastic absorb heat energy and destroy it before it reaches the top of the handle. Metal spoons produce their own heat energy when placed into hot liquids. Butter melts only when it comes into direct chemical contact with metal.

Correct Answer:

Metal is a good thermal conductor that transfers heat energy rapidly, while wood and plastic are poor thermal conductors.

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