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Homework Check!

Homework Check!. Take out the balancing practice from yesterday to verify answers!. Reaction Types and Written Reactions. January 23, 2013. Warm-up: Balancing. Count how many atoms are in each of the given Ca (NO 3 ) 2 9 4Li 2 O 12 Balance the following equations

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Homework Check!

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  1. Homework Check! • Take out the balancing practice from yesterday to verify answers!

  2. Reaction Types and Written Reactions January 23, 2013

  3. Warm-up: Balancing • Count how many atoms are in each of the given • Ca(NO3)2 • 9 • 4Li2O • 12 • Balance the following equations • __Mg + __HCl __MgCl2 + __H2 • Mg + 2HCl  MgCl2 + H2 • __AlBr3 + __K2O  __Al2O3 + __KBr • 2AlBr3+ 3K2O  1Al2O3+ 6KBr

  4. Written Reactions • Interpret • REACTANTS • PRODUCTS • STATE • Balance Reaction • Solidsodium is dropped into aqueous water to produce hydrogengas and aqueous sodium hydroxide • Na(s) + H2O(aq) H2(g) + NaOH(aq) • 2Na(s) + 2H2O(aq) H2(g)+ 2NaOH(aq)

  5. Key Words Solid Powdered Metal Liquid Aqueous Solution Acid Gas Bubbled Steam

  6. Practice • The Statue of Liberty, made of solid copper, reacts with the oxygen in the air to form a new coat of solid copper (II) oxide, which appears a chalky green • 2Cu(s) + O2(g) 2CuO(s)

  7. Warm-Up: Balancing II • __H2O2 __H2 + __O2 • 1H2O2 1H2+ 1O2 • __AgNO3 + __Cu  __Cu(NO3)2 + __Ag • 2AgNO3+ Cu  Cu(NO3)2 + 2Ag • __Pb(NO3)2 + __KI  __PbI2 + __KNO3 • 1Pb(NO3)2 + 2KI  1PbI2+ 2KNO3

  8. Reaction Types January 24th, 2013

  9. The Magic Genie • Write out FULL chemical equation • H2O2(aq) H2(g) + O2(g) • What kind of reaction is this? • Decomposition! • A single substance breaks down into two or more components • AB  A + B

  10. Synthesis • Two or more substances  one substance • 2H2 + O2  2H2O • A + B  AB

  11. Single Replacement • A single reactant REPLACES another • Silver Tree! • Cu + 2AgNO3 Cu(NO3)2 + 2Ag • A + BC  AC + B • Thermite!

  12. Double Replacement • Two anions/cations switch places with one another • Pb(NO3)2 + 2KI  PbI2+ 2KNO3 • AB + CD  AD + CB

  13. Combustion Reactions • Organic Molecule reacts with Oxygen to produce CO2 and H2O • Exothermic (produces heat) • CH4 + 2O2 CO2 + 2H2O • Methane Bubbles!

  14. Warm Up: Reaction Types Balance the following reactions and determine what type of reaction it is • __AgNO3 + __Cu  __Cu(NO3)2 + __Ag • Single Replacement • 2AgNO3+ 1Cu  1Cu(NO3)2 + 2Ag • __Li2O + __H2O  __LiOH • Synthesis • 1Li2O + 1H2O  2LiOH

  15. Activity Series January 28, 2013

  16. What is the Activity Series? • A list of metals/halogens that indicates an elements reactivity in regards to another element • How reactive something is

  17. Silver Nitrate and Copper Aids in predicting products for a reaction (Reaction vs. No Reaction) 2AgNO3 + Cu  Cu(NO3)2 + 2Ag Cu(NO3)2 + Ag  NO REACTION

  18. Precious Metals Good or Bad Location for Silver and Gold?

  19. Warm-up: Activity Series • AgCl+ Na  • NaCl + Ag • K2SO4 + Mg  • No Reaction

  20. Solubility January 29th, 2013

  21. What does solubility mean? IN REGARDS TO 2 SOLUTIONS… Soluble substances dissolve in water Insoluble substances do not dissolve in water, but form a precipitate Precipitates  solid substances

  22. Double Replacement Reactions • Typically, in a double replacement, • One product remains in solution (soluble) • One product forms a precipitate (insoluble) • How to predict? • Use experimentation, repeated trials • Solubility rules made • Not perfect, but usable

  23. Example • Ca(NO3)2 + Cu(OH)2 Ca(OH)2 + Cu(NO3)2 • All nitrates are soluble • All hydroxides insoluble • Ca(OH)2  Precipitate  (s) • Cu(NO3)2  in solution  (aq)

  24. In double replacements… • A reaction occurs if… • A precipitate forms • Water is a product • Gas is emitted (H2, O2…)

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