Balancing Chemical equations Pages 170 - 174. The “Law of Conservation of Mass” states that: the total mass of the reactants in a chemical equation is equal to the total mass of the products.
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The “Law of Conservation of Mass” states that: the total mass of the reactants in a chemical equation is equal to the total mass of the products.
To state the law simply: in a chemical reaction atoms are neither created or destroyed. They are only rearranged. Thus, there must be an equal number of atoms of each element on each side of the arrow in the equation.
Al3++ S2- -> Al2S3
reactant reactant product
2Al + 3S -> Al2S3
3. Count the number and types of atoms on each side of the arrows.
Two aluminum plus there sulfur produce two aluminum, three sulfur
Aluminum plus sulfur produce aluminum sulfide