To Do… Electronic homework (Lon-Capa) HW5 Type 1 due Monday, March 17 by 7 pm; HW5 Type 2 due Wednesday, March 19 by 7 pm Exam 2 review: due Wednesday, March 19 by 7pm Tuesday’s lecture: Stoichiometry Workshop Exam #2: Thursday, March 20, 7 pm

Review Sessions Tuesday, March Noyes Lab 7:00-8:50 pm Wednesday, March 19 Room: TBA Time: TBA

Clicker Question When lead(II) nitrate and potassium iodide are mixed, what precipitate will form? Pb(NO 3 ) 2(aq) + KI (aq) → A)KNO 3 B)KI C)Pb(NO 3 ) 2 D)PbI 2 E)No precipitate will form. Solubility Rules 1. Most nitrate salts are soluble. 2. Most salts of sodium, potassium, and ammonium cations are soluble. 3. Most chloride and iodide salts are soluble. Exceptions: Ag + and Pb Most sulfate salts are soluble. Exceptions: Ca 2+, Ba 2+, and Pb Most hydroxide salts are only slightly soluble. Soluble ones are: Na +, K +, and Ca Most sulfide, carbonate, and phosphate salts are only slightly soluble. 3

Stoichiometry Problem a) What volume of KI solution do you need to completely react with Pb(NO 3 ) 2 ? b) What is the mass of solid produced? 4

Stoichiometry Problem To react 10.0 g of hydrogen gas, what volume of oxygen gas would you need at 1.05 atm and 22°C? 2H 2(g) + O 2(g)  2H 2 O (g) 5

Clicker Question Which of the following reaction mixtures would produce the greatest amount of product, assuming all went to completion? Each involves the reaction symbolized by the equation: N 2 (g) + 3H 2 (g) → 2NH 3 (g) A)3 moles of N 2 and 3 moles of H 2 B)1 mole of N 2 and 6 moles of H 2 C)1 mole of N 2 and 3 moles of H 2 D)Each would produce the same amount of product. 2 mol NH 3 6