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

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A student places wet iron wool in a closed flask filled with air and tracks its mass over 5 days as rust forms: Day 1: 10.0 grams Day 3: 10.4 grams Day 5: 10.8 grams Why did the mass of the iron wool increase as it rusted?

Iron atoms multiplied inside the sealed flask. Oxygen gas from the air chemically combined with the iron to form rust. Water inside the flask created brand new iron matter. Light entering the glass flask added mass to the metal structure.

Correct Answer:

Oxygen gas from the air chemically combined with the iron to form rust.

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