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Section 3.3 Stoichiometry and Chemical Reactions

Section 3.3 Stoichiometry and Chemical Reactions. In this section: a. Chemical reactions and equations b. Balancing equations c. Reaction stoichiometry. Chemical reactions and equations Reactants Products. CH 3 CHCH 2 + HCl. CH 3 CHClCH 3.

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Section 3.3 Stoichiometry and Chemical Reactions

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  1. Section 3.3Stoichiometry and Chemical Reactions

  2. In this section:a. Chemical reactions and equationsb. Balancing equationsc. Reaction stoichiometry

  3. Chemical reactions and equations Reactants Products CH3CHCH2 + HCl CH3CHClCH3

  4. Chemical equation: before and afterMechanism: how you get there Step 1. Step 2.

  5. The most important thing: It’s the same atoms Reactants Products CH3CHCH2 + HCl CH3CHClCH3

  6. CH3CHCH2 + HCl CH3CHClCH3 The Law of Conservation of Matter It’s the same atomsStoichiometric Coefficients: C2H2 + 2 H2 CH3CH3

  7. Balancing Chemical EquationsGoal: same number of atoms of each element on both sidesRule: you can change stoichiometry coefficients,not the molecular formulas CH4 + O2 CO2+ H2O

  8. Another Example: Mg + O2MgO A bit harder C4H10 + O2 CO2+ H2O

  9. CH4 + 2 O2 CO2+ 2 H2O Big misconception: stoichiometric coefficients are NOT how much reacts/forms

  10. CH4 + 2 O2 CO2+ 2 H2O Balancing Equation = mol to mol conversion factor

  11. CH4 + 2 O2 CO2+ 2 H2O Amounts tables: If 0.46 mol O2 react, how much CO2 and H2O are formed, and how much CH4 reacts? change:

  12. Real experiments use mass, not moles.gram gram conversionsPath: grams A moles A moles B grams B

  13. 25.0 g of O2 react. What mass of CH4 reacts and what masses of CO2 and H2O are formed? CH4 + 2 O2 CO2+ 2 H2O

  14. 25.0 g of O2 react. What mass of CH4 reacts and what masses of CO2 and H2O are formed? CH4 + 2 O2 CO2+ 2 H2O

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