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Misconception SCM067:

The mass of a closed system will decrease if two substances combine to form one substance (AAAS Project 2061, n.d.).

Items that test for misconception SCM067 in this project (Original Project) and key idea (Whenever atoms interact with each o…)
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The number of each kind of atom stays the same during the reaction between copper and oxygen. (This item uses circles to represent atoms.)