CHE 106 Lecture Notes - Lecture 9: Chemical Equation, Stoichiometry
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Stoichiometry: calculation of quantities of reactants and products involved in a chemical reaction; based on balanced chemical equation and relationship between mass and moles. Chemical equation: symbolic representation of a chemical reaction in terms of chemical formulas. Reactants: starting substances in a chemical reaction- on left of equation. Products: end result of a chemical reaction- on right of equation. State of reactants and products are written as subscripts in parenthesis (g)= gas (s)= solid (l)= liquid (aq)= aqueous, dissolved in water. Coefficients: inserted in front of substances to balance equation; the number of molecules: when balancing equation, coefficient should be smallest possible whole number. Subscripts: number of atoms of each element in a molecule. Law of conservation of mass: total number of atoms of each element on both sides of equation must match. Combination reaction: two or more substances react to form one product: a+b=c. Decomposition reaction: one substance reacts to form two or more substances: c=a+b.
