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Announcements

Announcements. ENERGY MINOR PHYSICAL SCIENCE TUTORING CENTER EXAM #2 MOVED TO FRIDAY, 10/16. Gas Forming Reactions. Special class of acid-base reactions Combination of double displacement (swap) and decomposition reactions 2HCl + Na 2 CO 3  ?. Gas Forming Reactions.

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Announcements

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  1. Announcements ENERGY MINOR PHYSICAL SCIENCE TUTORING CENTER EXAM #2 MOVED TO FRIDAY, 10/16

  2. Gas Forming Reactions • Special class of acid-base reactions • Combination of double displacement (swap) and decomposition reactions • 2HCl + Na2CO3 ?

  3. Gas Forming Reactions • Vinegar + Baking Soda • CH3COOH + NaHCO3 ?

  4. What are the products of the reaction of calcium carbonate with acetic acid? CaCO3 + CH3COOH  • (CH3COO)2Ca(aq) + H2CO3(aq) • (CH3COO)2Ca(aq) + H2O(l)+ CO2(g) • (CH3COO)2CO3(aq) + H2Ca(aq) • (CH3COO)2Ca(s) + H2CO3(aq) • (CH3COO)2Ca(s) + H2O(l)+ CO2(g)

  5. Oxidation Reduction Reactions Redox Reactions Electron-Transfer Reactions

  6. Oxidation and Reduction • Reduction • Gain of electron(s) • Loss of oxygen • Oxidation • Loss of electron(s) • Gain of oxygen • “Redox”- if something is reduced, something else must be oxidized • Example: H2 + F2 → 2 HF

  7. Oxidation Numbers- Keeping Track of Charges • Oxidation #’s help keep track of electrons that are lost or gained by an atom • Redox reactions always involve change in oxidation numbers • Reduction= oxidation number decreases • Oxidation= oxidation number increases

  8. Rules for determining oxidation numbers • Each atom in a pure element has an ox. # of zero. • For monoatomic ions, ox.# is the charge on the ion. • Fluorine always has an ox. # of -1 in compounds. • Cl, Br, and I have an ox. # of -1 in compounds, except when combined with F or O. • The ox. # of H is +1 and of O is -2 in compounds • Exception for H: In compounds with metals, H is -1 • Exception of O: In peroxides, O22- ion gives O an ox. # of -1 • The sum of the oxidation numbers for all atoms is equal to the net charge of the molecule.

  9. What is the oxidation number of H in H2O? • +5 • +4 • +3 • +2 • +1 • 0 • -1 • -2 • -3

  10. What is the oxidation number of O in H2O? • +5 • +4 • +3 • +2 • +1 • 0 • -1 • -2 • -3

  11. What is the oxidation number of N in N2? • +5 • +4 • +3 • +2 • +1 • 0 • -1 • -2 • -3

  12. What is the oxidation number of N in NO2? • +5 • +4 • +3 • +2 • +1 • 0 • -1 • -2 • -3

  13. What is the oxidation number of N in NO3-? • +5 • +4 • +3 • +2 • +1 • 0 • -1 • -2 • -3

  14. What is the oxidation number of O in OF2? • +5 • +4 • +3 • +2 • +1 • 0 • -1 • -2 • -3

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