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Misconception SCM085:

Atoms can become heavier during a chemical reaction (AAAS Project 2061, n.d.).

Items that test for misconception SCM085 in this project (Original Project) and key idea (Whenever atoms interact with each o…)
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Two liquids undergo a chemical reaction in an open jar and bubbles form. The mass of the liquids is less after the reaction because some atoms went into the air.