When heated, oxygen reacts with copper to form copper oxide.oxygen moleculecopper atomscopper oxide moleculesKey:Oxygen atomCopper atomIf this reaction occurs in a sealed container, will the mass of the container and everything in itincrease, decrease, or stay the same and why?The mass will stay the same because the number of each kind of atom staysthe same.The mass will decrease because two substances combine to form onesubstanceThe mass will increase because a new kind of molecule is formed.©2021 lluminate EducationTM Inc. More information is needed to tell if the mass will change.©2021Illuminate Education TM, Inc.

In any chemical reaction, the total mass of the reactant will be equal to total mass of the…

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