WVGSA Grade 5 Science Practice Questions - West Virginia General Summative Assessment Grade 5 Science Exam

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A solid brass sphere barely fits through a brass ring at room temperature (20°C). When the brass sphere is heated over a flame for 2 minutes, it can no longer fit through the ring. After cooling back to 20°C, it fits easily again. What happened to the brass particles when heated?

Brass particles multiplied in number, making the sphere heavier. Brass particles gained thermal energy and vibrated faster, pushing slightly farther apart and expanding the sphere's volume without changing mass. Brass particles melted into gas inside the sphere, inflating it like a balloon. Brass particles shrank, forcing the outer brass surface to swell.

Correct Answer:

Brass particles gained thermal energy and vibrated faster, pushing slightly farther apart and expanding the sphere's volume without changing mass.

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