12. The following experiments were carried out and observations recorded. Expt. #1: copper metal was added to an aqueous solution of silver nitrate Observation:The copper become coated with a substance. Expt. #2: lead metal was added to an aqueous solution of copper(II) nitrate Observation: The lead turned black and crumbled. Expt. #3: zinc metal was added to an aqueous solution of lead(II) nitrate Observation: The zinc appeared to fall apart. Rank the metals from most active to least active. 13. A 0.9182 g sample of CaBr2is dissolved in enough water to give 500. mL of solution. What is the calcium ion concentration in this solution? A) 9.19 10–3M B) 2.30 10–3M C) 2.72 10–3M D) 4.59 10–3M E) 1.25 10–3M
14. A piece of zinc metal was added to an aqueous solution of lead(II) nitrate. After some time it was observed that the zinc metal had appeared to fall apart and a solid had accumulated at the bottom of the reaction vessel. Write the net ionic equation for this reaction. 15. Predict the products of the following single replacement reaction. Fe(s) + CuSO4(aq)
16. Identify the element being oxidized in the following reaction. 2KBr + F2Br2+ 2KF 17. Batteries in our cars generate electricity by the following chemical reaction. Pb + PbO2+ 2H2SO42PbSO4+ 2H2O What is the oxidizing agent in this process?