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Chem 120, Summer Quarter 2012 Name: Page 1 of 4 Quiz Section No.: EXPERIMENT 4 CLASSES OF CHEMICAL REACTIONS A) Combination Reactions: 1) Heating of aluminum: Observation: Chemical Equation: 2) Heating of copper: Observation: Chemical Equation: B) Decomposition Reactions: 1) Decomposition of ammonium carbonate: All observations 2) Decomposition of potassium iodate: Observations and chemical equations 3) Reactions of silver nitrate: Observations and chemical equations Test tube no. 1 Test tube no. 2 Test tube no. 3 4) Compound formed in test tube no. 1 after heating POST-LAB REPORT Chem 120, Summer Quarter 2012 Name: Page 2 of 4 Quiz Section No.: C) Single Replacement Reactions Test tube no. Solution Metal 1 H 2O Ca 2 H 2O Fe 3 H 2O Cu 4 3 M HCl Zn 5 6 M HCl Pb 6 6 M HCl Cu 7 0.1 M NaNO3 0.1 M CuCl2 Al 0.1 M AgNO3 Cu Test tube no. Solution Metal 1 H 2O Ca 2 H 2O Fe 3 H 2O Cu 4 3 M HCl Zn 5 6 M HCl Pb 6 6 M HCl Cu 7 0.1 M NaNO3 0.1 M CuCl2 Al 0.1 M AgNO3 Cu 8 9 8 9 Observations Al Al Balanced chemical equations Chem 120, Summer Quarter 2012 Name: Page 3 of 4 Quiz Section No.: D) Double Replacement Reactions Test tube no. Solution 1 Solution 2 1 0.1 M NaCl 0.1 M KNO3 2 0.1 M NaCl 0.1 M AgNO3 3 0.1 M Na2CO3 3 M HCl 4 3 M NaOH 3 M HCl 5 0.1 M BaCl2 3 M H2SO4 6 0.1 M Pb(NO3)2 0.1 M K2CrO4 7 0.1 M Fe(NO3)3 0.1 M Cu(NO3)2 3 M NaOH Test tube no. Solution 1 Solution 2 1 0.1 M NaCl 0.1 M KNO3 2 0.1 M NaCl 0.1 M AgNO3 3 0.1 M Na2CO3 3 M HCl 4 3 M NaOH 3 M HCl 5 0.1 M BaCl2 3 M H2SO4 6 0.1 M Pb(NO3)2 0.1 M K2CrO4 7 0.1 M Fe(NO3)3 3 M NaOH 8 0.1 M Cu(NO3)2 3 M NaOH 8 Observations 3 M NaOH Balanced Chemical Equations Chem 120, Summer Quarter 2012 Page 4 of 4 Name: Quiz Section No.: ANSWERS TO QUESTIONS: 1. Gold metal, Au, is valuable not just because it is rare but also because it is so durable. Au will not dissolve in hydrochloric acid or nitric acid. It takes a combination of the two to dissolve gold. Calcium metal, Ca, on the other hand reacts with water, H2O, to form Ca2+ ions. What information presented in this lab could enable you to predict this difference in reactivity. 2. From the following list of chemicals, select three combinations that would lead to a double displacement reaction. Write the complete, balanced equations for the reactions. LiBr 3. HNO3 AgNO3 Pb(NO3)2 Na2SO4 Potassium chlorate, KClO3, decomposes upon heating. Explain what is meant by a decomposition reaction. Write the complete balanced equation for the decomposition. What gas is given off, and how may it be detected? What chemical can be used to detect the remaining salt? Write and balance the chemical equation for this reaction.