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CHAPTER 3 STOICHIOMETRY - site.iugaza.edu.ps

/ / CHAPTER3 STOICHIOMETRY :CHEMICALEQUATIONS STOICHIOMETRY :The area of study that examines thequantities of substances consumed and produced inchemical reactions. Remember:Atoms are neither created nor destroyedduring any chemical reaction or physical process. / / CHEMICALEQUATIONSC hemical equation represents the chemical recation .The arrow is called the yield A chemical equation must have an equalnumber of atoms of each element on each sideof the arrow. / / RULES/HINTS FORBALANCINGEQUATIONS1) Use correct ) The coefficients must be the lowest ) Do not change or add subscripts(number of atomsof each element in a molecule).4) Balance H and O ) If a polyatomic ion stays together on both sides ofthearrow, then keep it together when + Na2CO3 2 NaCl + 2H2O + CO2C2H5OH + 3O2 2CO2+ following diagram represents a chemical reaction in which thered spheres are oxygen atoms and the blue spheres are ) Write the chemical formulas for the reactants and products.

١٢/٦/١٤٣٦ ١ CHAPTER 3 STOICHIOMETRY: CHEMICAL EQUATIONS Stoichiometry: The area of study that examines the quantities of substances consumed and produced in chemicalreactions. Remember: Atoms are neither created nor destroyed

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