chem001-chapter06-notes

chem001-chapter06-notes - CHEM 001 Lecture Notes, Prof....

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CHEM 001 Lecture Notes, Prof. Wei-Min Dai 43 Chapter 6 Chemical Accounting: Mass and Volume Relationships Chemical Equations C + O 2 CO 2 • Substances on left – Reactants – Starting materials • Substances on right – Products • + “and” “reacts to produce” Reading a Chemical Reaction C(s) + O 2 (g) CO 2 (g) • (s) solid • (l) liquid •(g ) g a s • (aq) aqueous or in water Balancing Chemical Equations
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CHEM 001 Lecture Notes, Prof. Wei-Min Dai 44 Suggestions for Balancing Chemical Equations 1. If element occurs once on each side, balance first 2. Balance any reactants or products that exist as free elements last CANNOT change subscripts CANNOT add/delete products or reactants Volume Relationships • Law of combining volumes – when all measurements are made at same temperature and pressure, volumes of gaseous reactants and products are in small whole- number ratio . [in 1809, Joseph Louis Gay-Lussac (1778 1850)] 3:1:2 2:1:2 Avogadro’s hypothesis – equal volumes of gases at constant pressure and temperature have the
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chem001-chapter06-notes - CHEM 001 Lecture Notes, Prof....

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