Science Assessment ~ Topics ~ Substances, Chemical Reactions, and Conservation of Matter ~ Misconception SCM029

Mass is not conserved during processes in which gases take part (Mas et al., 1987; Berkheimer et al., 1988; Hesse et al., 1992). If a gas is produced during a chemical reaction that takes place in a closed system, the total mass decreases (Ozmen et al., 2003).

Items that test for misconception SCM029 in this project (THSB) and key idea (Whenever substances within a closed…)
Item ID Number	Item Description	How Often the Misconception was Chosen	Select This Item for My Item Bank
SB066001	Two liquids undergo a chemical reaction in an open jar and bubbles form. The mass of the liquids is less after the reaction because a gas was produced and that gas left the system.	15%