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Probset3Key

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  • 1. Chemistry 2 Problem Set 3 33/30pts Instruction: Read the instructions carefully. Use black/blue pen. Use correction fluid when changing an aswer. (1pt each) A. Balance the following chemical equations. 1. H2SO4 + 2NaCN →2HCN+ Na2SO4 2. 2KClO3 (s) + heat →2KCl(s)+ O2 (g) 3. Ca (s) + 2H2O (l) → Ca(OH)2 (aq) + H2 (g) 4. C10H8+ 12O2 (g) → 10CO2 (g) + 4H2O (g) 5. C12H22O11 (s) + 8KClO3 (s) →10KCl(s)+ 12CO2 (g) + 11H2O(g) B. Write the formula of the products if any is formed. Write NR if no reaction occurs. Balance the respective equations. (2pts each) 1. 2K(s) + ZnCl2(aq) → 2KCl + Zn 2. Fe(s) + Na3PO4(aq) → NR 3. sodium nitrateaq+potassium phosphate(aq)→NR aq prods 4. silver chloride(s) + caustic soda(aq) → NR 5. Cl2(aq) + HF(aq) → NR F is more reactive C. Write the balanced net ionic equations of test B items. (Bonus 3pts) 2K(s) + Zn2+(aq) → 2K+ + Zn D. Use the following chemical reactions to prepare an activity series for the following hypothetical elements H, E, C, Oand M. (5pts) 2H + 3M2+ → 2H3+ + 3M O+ + E → O + E+ H + C+ → no reaction M+ E+ → no reaction H + 3E+ → H3+ + 3E M +2O+ → M2+ + 2O Most reactive _C_, _H_, _E_, _M_, _O_ Least E. Write the balanced chemical equation of the following reactions and identify the type of reaction. (2pts each.) 1. Aluminum metal is oxidized by oxygen from the air. 2Al + 3O2 → Al2O3 Synthesis 2. Sodium oxide reacts with carbon dioxide to form sodium carbonate. Na2O + CO2→Na2CO3 Synthesis 3. Limestone is heated. CaCO3→CaO + CO2 Decomposition 4. A solution of hydrochloric acid reacts with a solid calcium bicarbonate producing a solid, a liquid and a gas.2HCl+Ca(HCO3)2→ CaCl2+2H2O+2CO2 Double Displacement and Decompositon 5. Complete combustion of ethyl alcohol CH3CH2OH+O2→H2O+CO2 Combustion

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