Conservation of Mass are the processes by which materials are changed from one substance into another. Chemical reactions can be represented by chemical equations that follow the . Conservation in Chemical Reactions There are several conservation laws that apply to chemical reactions. ● According to the law of conservation of matter, matter cannot be or ; it can only . So, if atom of chlorine is present on the reactant side of an equation, atom of chlorine must be present on the product side of the equation. The chloride atom can combine with different atoms and form , but it can't from the equation. For example, consider the reaction of hydrogen gas and oxygen gas to form water: 2H2 + O2 2H2 O Draw the picture below that shows the same reaction using models of the atoms in the reaction: + + → + Although the atoms , there are hydrogen atoms and oxygen atoms on each side of the equation. This shows that atoms were created or destroyed, only rearranged. That is, matter is in the chemical reaction. ● The Law of Conservation of Mass According to the law of conservation of mass, during ordinary physical or chemical changes. So, if there are 100 grams of , 100 grams of must be produced. The mass stays during a chemical reaction.

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