OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System - Science, Grade 8 Exam

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Two identical balloons are filled with helium. Balloon A is placed in a warm room and Balloon B is placed in a cold refrigerator. After one hour, the student observes that Balloon A is larger than Balloon B. Using the kinetic theory of matter, which statement best explains this observation?

The helium particles in Balloon A move faster and collide with the walls harder and more often, exerting more outward pressure The helium particles in Balloon A lose energy and become larger in size, taking up more space The cold temperature in Balloon B causes the helium particles to multiply, increasing the pressure The warm room adds new helium particles to Balloon A through the rubber walls

Correct Answer:

The helium particles in Balloon A move faster and collide with the walls harder and more often, exerting more outward pressure

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