Science Assessment ~ Topics ~ Substances, Chemical Reactions, and Conservation of Matter ~ NGSS Link PS1.B-M.2

The total number of each type of atom is conserved, and thus the mass does not change.

Items associated with this NGSS statement in this project (Original Project) and key idea (Whenever atoms interact with each o…)
Item ID Number	Item Description	Select This Item for My Item Bank
SC090003	The number of each kind of atom stays the same during the reaction between copper and oxygen. (This item uses circles to represent atoms.)
SC043005	When baking soda and lemon juice react in a sealed plastic bag, the weight will not change because the number of each kind of atom does not change.
SC045004	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.
SC102002	The number of each kind of atom stays the same during a chemical reaction. (This item uses circles to represent atoms.)
SC092004	When a liquid changes to a gas in a sealed container and the number of atoms stays the same, the mass of the jar and everything in it also stays the same.