Chem Ch.4 Redox Reactions

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ballinbc14
ID:
41267
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Chem Ch.4 Redox Reactions
Updated:
2010-10-11 00:49:02
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Chem oxidation reduction reactions redox
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Description:
Outline of Ch.4's Oxidation Reduction Reactions section
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  1. What happens in a Redox reaction?
    One species loses electrons and another gains those lost electrons.
  2. The species that loses the electrons in a Redox reaction is said to be...
    Oxidized
  3. The species that gains an electron in a Redox reaction is said to be...
    Reduced
  4. The net ionic equation of Zinc in Hydrochloric Acid is: Zn(s) + 2H+(aq) ---> Zn2+(aq) + H2(g)
    What is the oxidation equation for that reaction?
    Zn(s) ---> Zn2+(aq) + 2e-
  5. The net ionic equation of Zinc in Hydrochloric Acid is: Zn(s) + 2H+(aq) ---> Zn2+(aq) + H2(g)
    What is the reduction equation for that reaction?
    2H-(aq) + 2e- ---> H2(g)
  6. Can you have oxidation without reduction?
    Nope
  7. Do the number of electrons within a redox reaction ever change?
    Nope...same amount of electrons on one side of the reaction as the other.
  8. The ion or molecule that accepts electrons is called the...
    Oxidizing agent
  9. The species that donates electrons is called the...
    Reducing agent
  10. Can Hydrogen gas be oxidized?
    Yes: H2(g) ---> 2H+(aq) + 2e-
  11. The net ionic equation of Zinc in Hydrochloric Acid is: Zn(s) + 2H+(aq) ---> Zn2+(aq) + H2(g)
    Which species is being oxidized?
    Zn
  12. The net ionic equation of Zinc in Hydrochloric Acid is: Zn(s) + 2H+(aq) ---> Zn2+(aq) + H2(g)
    Which species is reduced?
    H
  13. The net ionic equation of Zinc in Hydrochloric Acid is: Zn(s) + 2H+(aq) ---> Zn2+(aq) + H2(g)
    Which species is the oxidizing agent?
    H
  14. The net ionic equation of Zinc in Hydrochloric Acid is: Zn(s) + 2H+(aq) ---> Zn2+(aq) + H2(g)
    Which species is the reducing agent?
    Zn
  15. Are reducing agents reduced?
    No..they are oxidized
  16. What is the oxidation number for a monoatomic ion? (i.e. Na+ S2-)
    Simply the Charge of the ion
  17. What is Oxidation Rule 1?
    All elements in their elemental form have an oxidation # of 0
  18. What is the oxidation # of all elements in their elemental form? (i.e. H2)
    0
  19. What is Rule 2 of Oxidation?
    Group 1 metals in compounds or ions have an oxidation # of +1
  20. What is the oxidation # of Potassium?
    +1
  21. What is Oxidation Rule 3?
    Group 2 metals always have an oxidation # of +2
  22. Group 2 metals in compounds or ions have an oxidation # of what?
    +2
  23. What is the oxidation # of a monoatomic ion?
    Equals the charge of the ion.
  24. What is Oxidation rule 4?
    Oxygen in compounds or ions has an oxidation # of -2
  25. When does oxygen not have an oxidation number of -2?...What is the oxidation # then?
    When oxygen is in Peroxide form (O22-)...here the oxidation # is -1
  26. What are the possible oxidation #s of Hydrogen ions?
    +1 or -1
  27. What is the sum of the oxidation # in neutral species?
    equals 0
  28. What is the oxidation # of phosphorous in H2PO4- ?
    • -1 = 4(-2) + 2(+1) + X
    • X = -1 - (-8) - 2
    • X = 5
    • Oxidation # Phosphorous = +5
  29. Oxidation # is increased when a species is...
    Oxidized

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