hChapter 9 - Chapter 9 Chemical reactions balancing...

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Unformatted text preview: Chapter 9 Chemical reactions balancing equations Chemical masses relative mass formula weight Reaction rates Chemical reaction the formation of new compounds by rearranging atoms Chemical equation: Reactants Products A + B C Phases The phase of the reactants and products must be included in the equation Each phase is noted as a single letter subscript in parentheses on each molecule in the reaction A(s) + B(l) C(g) Equations must be Balanced The law of mass conservation tells us matter is neither created nor destroyed in a chemical reaction Thus equal number of atoms must be on the reactant and product sides This is referred to as a balanced equation The numbers appearing before each molecule are referred to as coefficients Chemical reactions are simply rearrangements of atoms The number of atoms on each side of the arrow must be equal Remember the Law of Mass Conservation Balanced Equations 2H2(g) + O2(g) 2H2O(l) 4H 2O 4H, 2O = balanced C(s) + O2(g) CO2(g) 1C 2O 1C, 2O = balanced NO(g) N2O(g) + NO2(g) 1N, 1O 2N, 1O 1N, 2O = not balanced To balance an unbalanced equation you must change the coefficients in front of each molecule until the number of atoms match on each side You can not change the subscripts on the molecules or you change the molecule H2O and H2O2 are very different compounds Balance the following NO(g) N2O(g) + NO2(g) CH4(g) + O2(g) CO2(g) + H2O(l) H2(g) + N2(g) NH3(g) H3PO4(l) + NaOH(l) Na3PO4(l) + H2O(l) Relative Mass We know atoms react in whole number ratios with one another...
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hChapter 9 - Chapter 9 Chemical reactions balancing...

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