ILTS Science Biology (239) Practice Questions - ILTS Science Biology (239) Test Exam

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A student measures the mass of a reactant as 12.0 g and a product as 11.7 g and concludes mass was lost. Which explanation best reflects sound scientific reasoning about this discrepancy in a closed-system reaction?

A gaseous product likely escaped or measurement error occurred, because mass is conserved Mass is genuinely destroyed during chemical reactions The law of conservation of mass applies only to physical changes The reaction violated the first law of thermodynamics

Correct Answer:

A gaseous product likely escaped or measurement error occurred, because mass is conserved

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