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Chemistry 1115 Chapter 3

Chemistry 1115 Chapter 3. STOICHIOMETRY: Calculations with Chemical Formulas and Equations. Law of Conservation of Mass. Total ____ does not change in the reaction Mass of __________ = mass of products Atoms are neither ________ nor ________ during a Chemical Rxn. Chemical Equations I.

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Chemistry 1115 Chapter 3

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  1. Chemistry 1115 Chapter 3 STOICHIOMETRY: Calculations with Chemical Formulas and Equations

  2. Law of Conservation of Mass • Total ____ does not change in the reaction • Mass of __________ = mass of products • Atoms are neither ________ nor ________ during a Chemical Rxn.

  3. Chemical Equations I • What and how much are we dealing with • _________ - what we start with • ______ - what we end with

  4. Chemical Equations II • _______ •  • equivalent to an = symbol • These reactants yield or produce these products

  5. Chemical Equations III • _________ • Used to ________ individual compounds • Example: H2SO4

  6. Chemical Equations IV • _________ • used to balance the equation H2SO4 + 2NaOH 2H2O + Na2SO4

  7. Chemical Equations V Problems: HBr + Ba(OH)2 H2O + BaBr2

  8. How To Balance Equations • _______ all compounds to see if they are balanced. • Balancing Rule of Thumb! • _______ • _________ except Hydrogen & Oxygen • Check all ________ one more time. • If it won’t balance check “A” again! • Apply Mud Puddle Theory

  9. Chemical Equations VI • Problems: • H3PO4 + KOH  H2O + K3PO4

  10. Chemical Equations VII • Problems: KClO3 KCl + O2

  11. Chemical Equations VIII • Problems: NaHCO3 + H3C6H5O7 CO2 + H2O + Na3C6H5O7

  12. Balance this Equation! Lithium Nitrite is added to calcium phosphate to produce lithium phosphate and calcium nitrite

  13. In what form are they found?2Na(S) + 2H2O(l) 2NaOH(aq) + H2(g) • States of the reactants & products • s – ________ • l – ________ • g – ________ • aq – _______

  14. Types of Reactions __________ Reactions Ex: C2H5OH +3O2 2CO2 + H2O _________ Reactions Ex: A + B  C _________ Reactions Ex: C  A + B

  15. _______ and _______ Weights • Both mean the same thing • Technically: • formula wts. are for ________ substances • molecular wts. are for _______ compounds.

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