MAP Science Grade 5 Practice Questions - Missouri Assessment Program (MAP) Science - Grade 5 Exam

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A student in St. Louis pumps air into a rubber balloon until it expands and becomes firm. Even though air cannot be seen inside the balloon, which statement best explains why the balloon expands?

Air is made of tiny particles that move around and push against the inside walls of the balloon. Air turns into a solid material when forced into a flexible rubber container. Air increases the weight of the balloon by absorbing heat from the room. Air creates a vacuum inside the balloon that pulls the rubber outward.

Correct Answer:

Air is made of tiny particles that move around and push against the inside walls of the balloon.

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