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Wednesday December 2, 2009 (Discussion)

Wednesday December 2, 2009 (Discussion). Write both the word equation and balanced formula equation for the following reaction. Solid zinc (II) sulfide reacts with oxygen gas to produce solid zinc (II) oxide and gaseous sulfur dioxide. Bell Ringer 12-2-09. Announcements.

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Wednesday December 2, 2009 (Discussion)

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  1. WednesdayDecember 2, 2009(Discussion)

  2. Write both the word equation and balanced formula equation for the following reaction.Solid zinc (II) sulfide reacts with oxygen gas to produce solid zinc (II) oxide and gaseous sulfur dioxide. Bell Ringer12-2-09

  3. Announcements • Our next test will be next Tuesday – 12/8.

  4. Assignments Currently Open

  5. Sample Problem Aluminum sulfate and calcium hydroxide are used in a water-purification process. When added to water, they dissolve and react to produce two insoluble products, aluminum hydroxide and calcium sulfate. These products settle out, taking suspended solid impurities with them. Write a balanced chemical equation for the reaction. Al2(SO4)3 + Ca(OH)2→ Al(OH)3 + CaSO4 3 2 3

  6. Types of Chemical Reactions Synthesis Reactions Decomposition Reactions Single-Replacement Reactions Double-Replacement Reactions Combustion Reactions

  7. Synthesis Reactions In synthesis reactions (also called addition reactions), two or more substances combine to form a new compound. A + X → AX 2Mg + O2 → 2MgO 2H2 + O2 → 2H2O 16Rb + S8 → 8Rb2S CaO + H2O → Ca(OH)2

  8. Decomposition Reactions In a decomposition reaction, a single compound undergoes a reaction that produces two or more simpler substances. AX → A + X 2H2O → 2H2 + O2 2HgO → 2Hg + O2 2KClO3 → 2KCl + 3O2

  9. Single-Replacement Reactions In a single-replacement reaction, one element replaces a similar element in a compound. A + BX → AX + B Mg + 2HCl → MgCl2 + H2 Cl2 + 2KBr → 2KCl + Br2 2Al + 3Pb(NO3)2 → 3Pb + 2Al(NO3)3

  10. Double-Replacement Reactions In a double-replacement reaction, the ions of two compounds exchange places in an aqueous solution to form two new compounds. AX + BY → AY + BX HCl + NaOH → NaCl + H2O 2KI + Pb(NO3)2 → PbI2 + 2KNO3 FeS + 2HCl → H2S + FeCl2

  11. Combustion Reactions In a combustion reaction, a carbon-containing substance combines with oxygen to produce carbon dioxide and water, and releasing a large amount of energy in the form of light and heat. CX + O2→ CO2 + H2O CH4 + 2O2 → CO2 + 2H2O C3H6 + 5O2 → 3CO2 + 4H2O

  12. Activity Series • The ability of an element to react is called the element’s activity. • An activity series is a list of elements organized according to the ease with which the elements undergo certain chemical reactions. • For metals, greater activity means a greater ease of loss of electrons, to form positive ions. • For nonmetals, greater activity means a greater ease of gain of electrons, to form negative ions.

  13. Activity Series • The order in which the elements are listed in an activity series is usually determined by single-replacement reactions. • The most active element, placed at the top in the series, can replace each of the elements below it from a compound in a single-replacement reaction. • An element farther down can replace any element below it but not any above it. • Activity series are used to help predict whether certain chemical reactions will occur.

  14. Activity Series • See Table 8-3. • Ex) According to the activity series for metals, aluminum replaces zinc. • We, therefore, can predict that the following reaction does occur: • 2Al + 3ZnCl2 → 3Zn + 2AlCl3 • Ex) Cobalt cannot replace sodium • We, therefore, can predict that the following reaction does not occur: • Co + 2NaCl → no reaction

  15. Activity Series Sample Problem Sn + O2 → SnO2 Any metal more active than silver will react with oxygen to form an oxide. Tin is above silver in the activity series, therefore a reaction will occur. The product will be tin oxide, either SnO or SnO2

  16. Activity Series Sample Problem Cd + Pb(NO3)2 → Pb + Cd(NO3)2 An element will replace any element below it in the activity series from a compound in aqueous solution. Cadmium is above lead, therefore a reaction will occur to produce lead and cadmium nitrate.

  17. Activity Series Sample Problem Cu + HCl → no reaction Any metal more active than hydrogen will replace hydrogen from an acid. Copper is not above hydrogen in the series, therefore no reaction will occur.

  18. Activity Series Question How is the activity series useful in predicting chemical behavior? It helps predict whether a chemical reaction will occur and what the product(s) of the reaction will be.

  19. Activity Series Question Based on the activity series, predict whether the following reaction will occur? Ni + H2O → No

  20. Activity Series Question Based on the activity series, predict whether the following reaction will occur? Br2 + KI → 2KBr + I2

  21. Activity Series Question Based on the activity series, predict whether the following reaction will occur? Au + HCl → No

  22. Activity Series Question Based on the activity series, predict whether the following reaction will occur? Cd + HCl → CdCl2 + H2 2

  23. Activity Series Question Based on the activity series, predict whether the following reaction will occur? Mg + Co(NO3)2→ Mg(NO3)2 + Co

  24. Continue Worksheet Chemical Reactions and Equations (Page 189)

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