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

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A student pulls back the plunger of a sealed syringe containing 5 mL of liquid water. The liquid evaporates into invisible water vapor gas inside the sealed syringe. What happened to the mass of the water inside?

Mass decreased because gases have no mass. Mass remained the same because liquid water molecules changed into gas molecules inside a closed container. Mass increased because gases take up more space. Mass dropped to zero because water disappeared.

Correct Answer:

Mass remained the same because liquid water molecules changed into gas molecules inside a closed container.

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