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March 15, 2010

March 15, 2010. Complete the Warm up at your table (Balancing R eactions) You will need paper and something to write with Today we will be discussing: “How do you recognize and represent chemical changes?”. Homework: Synthesis Worksheet. Important Dates: 4/2: Reaction Test.

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March 15, 2010

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  1. March 15, 2010 • Complete the Warm up at your table (Balancing Reactions) • You will need paper and something to write with • Today we will be discussing: “How do you recognize and represent chemical changes?” • Homework: • Synthesis Worksheet • Important Dates: • 4/2: Reaction Test

  2. Types of Reactions • Five types of reactions: • 1. Synthesis (Combination) • 2. Decomposition • 3. Single Replacement • 4. Double Replacement • 5. Combustion

  3. Synthesis • Synthesis reactions: • A chemical reaction in which two or more substances react to form a single product • A + B → AB • 2SO2(g) + O2(g) → 2SO3(g) • 2Na(s) + Cl2(g) → 2NaCl(2)

  4. Predicting Synthesis Products • 6 types of synthesis reactions: • 1. Metals with Oxygen gas • 2. Nonmetals with Oxygen gas • 3. Metals Oxides with Water • 4. Nonmetals Oxides with Water • 5. Metals with Nonmetals • 6. Nonmetals with Nonmetals

  5. Metals withOxygen gas • M(s) + O2(g) → M2OX(s) • 4Al(s) + 3O2(g) → 2Al2O3(s) • K(s) + O2(g) → ? • 4K(s) + O2(g) → 2K2O(s) • Mn(s) + O2(g) → ? • 2Mn(s) + O2(g) → 2MnO(s)

  6. NonmetalswithOxygen gas • MN (s, l, or g) + O2(g) → MNO • C(s) + O2(g) → CO2(g) • S(s) + O2(g) → SO2(g) • N2(g) + O2(g) → NO2(g)

  7. Metals Oxides withWater • M2Ox(s) + H2O(l) → M(OH)x(s) • MgO(s) + H2O(l) → Mg(OH)2(s) • K2O(s) + H2O(l) → ? • K2O(s) + H2O(l) → 2KOH(s) • Zn2O(s) + H2O(l) → ? • Zn2O(s) + H2O(l) → 2ZnO(s)

  8. Nonmetals Oxides withWater • MNO(s, l, g) + H2O(l) → Acid • CO2(g) + H2O(l) → H2CO3(aq) • SO2(g) + H2O(l) → ? • SO2(g) + H2O(l) → H2SO3(aq) • SO3(g) + H2O(l) → ? • SO3(g) + H2O(l) → H2SO4(aq)

  9. MetalswithNonmetals • M(s) +MN(s, l, g) → Salt(s) • 2Na(s) + Cl2(g) → 2NaCl(s) • Sr(s) + N2(g) → ? • 3Sr(s) + N2(g) → Sr3N2(s) • Cu(s) + S(s) → ? • Cu(s) + S(s) → CuS(s)

  10. NonmetalswithNonmetals • NM + NM → covalent compound • 2P(s) + 3Cl2(g) → 2PCl3(g) • C(s) + S(s) → ? • C(s) + 2S(s) → CS2(l) • B(s) + H2(g) → ? • 2B(s) + 3H2(g) → 2BH3(g)

  11. March 15, 2010 • Turn Inquiry Journal into the box at the front of the room • Complete the Warm up at your table (Balancing Reactions) • You will need paper and something to write with • Today we will be discussing: “How do you recognize and represent chemical changes?” Important Dates: 3/16: Polyatomic quiz 4/2: Reaction Test Homework: Synth. and decomp. W/S

  12. Synthesis • Synthesis reactions: • A chemical reaction in which two or more substances react to form a single product • A + B → AB • 2SO2(g) + O2(g) → 2SO3(g) • 2Na(s) + Cl2(g) → 2NaCl(2)

  13. Predicting Synthesis Products • 6 types of synthesis reactions: • 1. Metals with Oxygen gas • 2. Nonmetals with Oxygen gas • 3. Metals Oxides with Water • 4. Nonmetals Oxides with Water • 5. Metals with Nonmetals • 6. Nonmetals with Nonmetals

  14. Predicting Synthesis Products • 6 types of synthesis reactions: • 1. Metals + Oxygen gas → Metal oxide • 4Al(s) + 3O2(g) → 2Al2O3(s) • 2. Nonmetals + Oxygen gas → Nonmetal oxide • C(s) + O2(g) → CO2(g) • 3. Metals Oxides + Water → Metal Hydroxide • MgO(s) + H2O(l) → Mg(OH)2(s)

  15. Predicting Synthesis Products • 6 types of synthesis reactions: • 4. Nonmetals Oxides + Water → Acid • CO2(g) + H2O(l) → H2CO3(aq) • 5. Metals + Nonmetals → Salt • 2Na(s) + Cl2(g) → 2NaCl(s) • 6. Nonmetals + Nonmetals → Covalent Compound • 2P(s) + 3Cl2(g) → 2PCl3(g)

  16. Synthesis Practice • K(s) + O2(g) → ? • 4K(s) + O2(g) → 2K2O(s) • N2(g) + O2(g)→ ? • N2(g) + O2(g) → NO2(g) • K2O(s) + H2O(l) → ? • K2O(s) + H2O(l) → 2KOH(s) • SO2(g) + H2O(l) → ? • SO2(g) + H2O(l) → H2SO3(aq) • Sr(s) + N2(g) → ? • 3Sr(s) + N2(g) → Sr3N2(s) • C(s) + S(s) → ? • C(s) + 2S(s) → CS2(l)

  17. Decomposition • Decomposition Reaction: • A reaction in which a single compound breaks down into two or more elements or new compounds • AB → A + B • NH4NO3(s) → N2O(g) + 2H2O(g) • 2NaN3(s) → 2Na(s) + 2N2(g)

  18. Predicting Decomposition Products • 1. Nonmetal Oxides OrMetal Oxides • 2. Metal Hydroxides • 3. Acids • 4. Salts and covalent compounds • 5. Metallic carbonates • 6. Metallic chlorates

  19. Predicting Decomposition Products • 1. Nonmetal Oxides OrMetal Oxides • Nonmetal Oxide → Nonmetal + Oxygen • 2SO3(g) → 2S(s) + 3O2(g) • Metal Oxides → Metal + Oxygen • 2Na2O(s) → 4Na(s) + O2(g) • 2. Metal Hydroxides → Metal oxide + Water • Ca(OH)2(s) → CaO(s) + H2O(l) • 3. Acids → Nonmetal oxide + Water • H2SO4(aq) → SO3(g) + H2O(l)

  20. Predicting Decomposition Products • 4. Salts and covalent compounds • Salts → Metal + Nonmetal • 2NaCl(s) → 2Na(s) + Cl2(g) • Covalent compounds → Nonmetal + Nonmetal • 2BH3→ 2B(s) + 3H2(g) • 5. Metallic carbonates → Metallic Oxide + Carbon Dioxide • CaCO3(s) → CaO(s) + CO2(g) • 6. Metallic chlorates → Metallic Chloride + Oxygen • 2KClO3 → 2KCl + 3O2

  21. Decomposition Practice • SrO(s) → ? • 2SrO(s) → 2Sr(s) + O2(g) • MgS(s) → ? • MgS(s) → Mg(s) + S(s) • SiO2 → ? • SiO2 → Si(s) + O2(g) • Ba(OH)2(s) → ? • Ba(OH)2(s) → BaO(s) + H2O(l) • H2SO4(aq)→ ? • H2SO4(aq)→ SO3(g) + H2O(l) • NCl3(s)→ ? • 2NCl3(s)→ N2(g) + 3Cl2(g) • Li2CO3→ ? • Li2CO3 → Li2O(s) + CO2(g) • Fe(ClO3)2 → ? • Fe(ClO3)2 → FeCl2+ 3O2

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