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Unit 13 Chemical Reactions
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Unit 13 Chemical Reactions

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  • 1. Unit 13:CHEMICAL REACTIONS
    Reactants: Zn + I2
    Product: Zn I2
  • 2. Unit 13 Learning Objectives:
    • Explore the nature of chemical reactions, including catalysts and reactants.
  • Unit 13 Learning Objectives:
    • Explore the nature of chemical reactions, including catalysts and reactants.
    • 3. Law of conservation of mass and energy.
  • Unit 13 Learning Objectives:
    • Explore the nature of chemical reactions, including catalysts and reactants.
    • 4. Law of conservation of mass and energy.
    • 5. Write and balance chemical equations.
  • Unit 13 Learning Objectives:
    • Explore the nature of chemical reactions, including catalysts and reactants.
    • 6. Law of conservation of mass and energy.
    • 7. Write and balance chemical equations.
    • 8. Learn to classify the different reaction types.
  • A Little Review of the Terms
    • Chemical Reaction: when two or more substances come together to form a NEW substance, this is a chemical reaction!
    • 9. Substances can be Atoms, Molecules, or Compounds
    Reactants
    Products
    Chemical reaction is occurring
  • 10. A Little Review of the Terms
    • Chemical Reaction: when two or more substances come together to form a NEW substance, this is a chemical reaction!
    • 11. Substances can be Atoms, Molecules, or Compounds
    • 12. Reactants are the things being brought together to react
    • 13. Products are the new stuff that is made in the reaction!
    Reactants
    Products
    Chemical reaction is occurring
  • 14. Identifying chemical reactions
    The release of heat and/or light
    The formation of a solid when two liquids are mixed together (precipitate)
  • 15. Identifying chemical reactions
    The change in color when two liquids are poured together
    The formation of a gas from a
    liquid solution
  • 16. Chemical Equations
    Because of the principle of the
    conservation of matter
    The chemical equation must be balanced
    It must have the same number of atoms of the same kind on both sides.
    C3H8 + O2 CO2 + H2O
    C = 3 H = 8 O =2 C = 1 H = 2 O = 3
  • 17. Balancing Equations
    C3H8 + O2 CO2 + H2O
    3C 8H
    C3H8 + O2 CO2 + H2O
  • 18. Balancing Equations
    C3H8 + O2 CO2 + H2O
    C3H8 + O23CO2 + 4H2O
    10 O = 6 O + 4 O
  • 19. Balancing Equations
    C3H8 + O2 CO2 + H2O
    C3H8 + O23CO2 + 4H2O
    10 O
  • 20. Balancing Equations
    C3H8 + O2 CO2 + H2O
    C3H8 + 5O23CO2 + 4H2O
    10 O
  • 21. Which one of the following is a balanced equation?
    Ca (s) + O2 (g) -> 2CaO (s)
    B. 2Ca (s) + O2 (g) -> 2CaO (s)
    C. 3Ca (s) + O2 (g) -> CaO (s)
    D. 6Ca (s) + O2 (g) -> 2CaO (s)
    Secret Question
  • 22. Which one of the following is a balanced equation?
    Ca (s) + O2 (g) -> 2CaO (s)
    B. 2Ca (s) + O2 (g) -> 2CaO (s)
    C. 3Ca (s) + O2 (g) -> CaO (s)
    D. 6Ca (s) + O2 (g) -> 2CaO (s)
    Secret Question
  • 23. Which one of the following is a balanced equation?
    Ca (s) + O2 (g) -> 2CaO (s)
    B. 2Ca (s) + O2 (g) -> 2CaO (s)
    C. 3Ca (s) + O2 (g) -> CaO (s)
    D. 6Ca (s) + O2 (g) -> 2CaO (s)
    2O
    2Ca and 2O
    2Ca
    Secret Question
  • 24. Symbols Used in Equations
    Solid (s)
    Liquid (l)
    Gas (g)
    Aqueous solution (aq)
    Catalyst H2SO4
    Change of temperature () Delta
  • 25. Chemical Equations
    Reactants and Products
    Al (s) + O2 (g) ---> Al2O3 (s)
    Stoichiometry:
  • 26. Chemical Equations
    Reactants and Products
    Al (s) + O2 (g) ---> Al2O3 (s)
    Stoichiometry:
    2Al
    2
  • 27. Chemical Equations
    Reactants and Products
    Al (s) + O2 (g) ---> Al2O3 (s)
    Stoichiometry:
    3O
    2 times what equals 3?
  • 28. Chemical Equations
    Reactants and Products
    Al (s) + O2 (g) ---> Al2O3 (s)
    Stoichiometry:
    3O
    2 times what equals 3? 1.5
    but, that is not a whole number…
    So, what do we do?
  • 29. Chemical Equations
    Reactants and Products
    Al (s) + O2 (g) ---> 2Al2O3 (s)
    Stoichiometry:
    6O
    2 times what equals 6?
  • 30. Chemical Equations
    Reactants and Products
    Al (s) + 3O2 (g) ---> 2Al2O3 (s)
    Stoichiometry:
    6O
    2 times what equals 6?
  • 31. Chemical Equations
    Reactants and Products
    Al (s) + 3O2 (g) ---> 2Al2O3 (s)
    Stoichiometry:
    4Al
    2 times what equals 6?
  • 32. Chemical Equations
    Reactants and Products
    4Al (s) + 3O2 (g) ---> 2Al2O3 (s)
    Stoichiometry: is the part of chemistry that studies amounts of substances that are involved in reactions.
  • 33. Chemical Equations
    Fe2O3 = rust
    Aluminum powder
    What happens when you mix rust and aluminum?
    Thermite Reaction
  • 34. Chemical Equations
    Fe2O3 + 2Al -> 2Fe + Al2O3
    Thermite Reaction
    http://www.youtube.com/watch?v=sjLgzgflCk8&feature=related
  • 35. Chemical Equations
    Fe2O3 + 2Al -> 2Fe + Al2O3
    Thermite Reaction
    This reaction needs a lot of heat to get started, but produces far more heat afterwards (> 2000°F)
  • 36. Classifying Reactions
    Five main types:
    Synthesis
    Combustion
    Decomposition
    Single displacement
    Double displacement
  • 37. Synthesis Reaction
    Two or more substances combine to form another substance.
    For example: A + B  AB
    2H2+ O2 2H2O
    2 or more simpler substances  one more complex substance
  • 38. Decomposition Reactions
    Opposite of synthesis.
    One substance breaks down into 2 or more other substances.
    AB  A + B
    One compound 2 or more simpler substances
    2H2O 2H2+ O2
    electricity
  • 39. Single Replacement Reaction
    One element replaces another element in a compound
    A + BC  AC + B
    Element + compound  new element + new compound
    Zn + CuSO4  ZnSO4 + Cu
  • 40. Double Replacement Reactions
    Positive ion of one compound replaces the positive ion of the other
    AB + CD  AD + CB
    2 compounds 2 new compounds
    Forms precipitate, covalent compound, or gas
    AgNO3 (aq) + NaCl (aq) -> AgCl (s) + NaNO3 (aq)
  • 41. Combustion
    Reaction of a substance with oxygen and a flame
    If it is combustion of a hydrocarbon, you always get CO2 and H2O (both gases)
    Oxygen (O2) is always a reactant.
    C3H8 + 5 O2 -> 3 CO2 + 4 H2O + heat