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Misconception AMM003:

A gas is not a substance with weight and mass, therefore a gas is not matter (Mitchell et al., 1984; Mas et al., 1987; Renstrom et al., 1990; Stavy, 1990, 1991; Lee et al., 1993). For example, students may believe that air is not made up of atoms (AAAS Project 2061, n.d.).

Items that test for misconception AMM003 in this project (THSB) and key idea ()
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SB002002

During a reaction where a reactant enters the system and no products leave, the mass of the system increases because the system now contains more atoms.

13%