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Quiz 3/30/05 In a group of 2

Lab 30 tomorrow! Please do pre-lab and summary. Quiz 3/30/05 In a group of 2. Active metal oxides react with water to form hydroxides. ex: 1. Na 2 O + H 2 O  ________ Halogens react with metals to form salts 2. Mg + Cl 2  _____ Metals react with oxygen to form oxides

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Quiz 3/30/05 In a group of 2

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  1. Lab 30 tomorrow! Please do pre-lab and summary Quiz 3/30/05In a group of 2 • Active metal oxides react with water to form hydroxides. ex: • 1. Na2O + H2O  ________ • Halogens react with metals to form salts • 2. Mg + Cl2  _____ • Metals react with oxygen to form oxides • 3. K + O2  ______ • Substances may decompose when exposed to electricity: • 4. NaCl  ____ + _____ • metal carbonates decompose to form metal oxides and carbon dioxide. • 5. Al2(CO3)3  ___________+ __________ • metal hydroxides decompose to form metal oxides and water. • 6. Mg(OH)2  _________ + _________

  2. Quiz 3/30/05Answers • Active metal oxides react with water to form hydroxides. ex: • 1. Na2O + H2O  2 NaOH_ • Halogens react with metals to form salts • 2. Mg + Cl2  MgCl2 • Metals react with oxygen to form oxides • 3. 4 K + O2  2K2O • Substances may decompose when exposed to electricity: • 4. 2 NaCl  2Na + Cl2 • metal carbonates decompose to form metal oxides and carbon dioxide. • 5. Al2(CO3)3  Al2O3+ 3 CO2 • metal hydroxides decompose to form metal oxides and water. • 6. Mg(OH)2  MgO + H2O

  3. DecompositionAX  A + X • 2MgO  2Mg + O2 Mg O Mg O

  4. Practice decomposing oxides: 2 4 2 2 2 • CuO  • Fe2O3  • MnO2  • PbO  2 Cu + O2 Fe + O2 Mn + O2 Pb + O2 3

  5. Decompositionof metal carbonatesACO3 AO + CO2(g) • SrCO3 (s) SrO (s) + CO2(g) O Sr This reaction occurs when you heat strontium carbonate. strontium oxide and carbon dioxide form. C O O

  6. Practice decomposing carbonates: • CuCO3 • Na2CO3  • MgCO3  • Ag2CO3  CuO + CO2 Na2O + CO2 MgO + CO2 Ag2O + CO2

  7. Decompositionof metal hydroxidesAOH  AO + H2O (g) • Ca(OH)2 (s) CaO (s) + H2O (g) H O Ca This reaction occurs when you heat calcium hydroxide. calcium oxide and water form. O H

  8. Practice decomposing hydroxides: 2 2 3 • NaOH  • Al(OH)3  • Cu(OH)2  • Mg(OH)2  Na2O + H2O Al2O3 + H2O CuO + H2O MgO + H2O

  9. Decomposition of metal chloratesAClO3 ACl + O2(g) • 2KClO3 (s) 2KCl (s) + 3O2(g) O O Cl Cl K K O O This reaction occurs when you heat potassium chlorate. potassium chloride and oxygen form. O O

  10. Practice decomposing chlorates: 3 2 2 3 2 2 • HClO3 • NaClO3  • Cu(ClO3)2  HCl + O2 NaCl + O2 CuCl2 + O2 3

  11. Decomposition of acidsH2CO3 (aq) H2O (l) + CO2(g) O H H C Carbonic acid in pop decomposes when warmed. water and carbon dioxide form. O O

  12. Combined Practice: 4 Ag + O2 • 2 Ag2O  • 2 CuClO3 • Na2CO3  • Ca(OH)2  2 CuCl2 + 3 O2 Na2O + CO2 CaO + H2O

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