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Announcements Be respectful – no electronics please! Post/Pre-lecture assignment due Thursday 8 am Textbook homework due Friday in discussion Chapter 7 questions only (can remove chapter 6 questions! ) Lab again on Monday Feedback from Google Form Discussion/homework questions What is the purpose of the quicksand video?

So far… Balancing Chemical Equations Writing reactions in words from formulas ---------------------------- Today… Predicting products Solubility Molecular, complete, and net ionic equations

Clicker #1 Balance the following equation and determine the sum of the coefficients: C2H5OH + O2 → CO2 + H2O A) 4 B) 5 C) 8 D) 9 E) 10 This is a quick way for us to see if you balanced the equation correctly.

Clicker #2 Discussion Question What are the products that are expected to form from the following two reactants? For every incorrect choice, determine why it is incorrect. AgNO3 + Na2CO3  AgCO3 and NaNO3 Ag2CO3 and NaNO3 AgCO3 and Na2NO3 AgNa2 and NO3CO3 NO3Na and CO3Ag

Solubility Rules (Page 167) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride salts are soluble. Exceptions: Ag+ and Pb2+. Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+. Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+. Most sulfide, carbonate, and phosphate salts are only slightly soluble.

Solubility Rules (Page 167) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride salts are soluble. Exceptions: Ag+ and Pb2+. Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+. Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+. Most sulfide, carbonate, and phosphate salts are only slightly soluble. How many are soluble? PbCl2 NaCl BaSO4 Fe(OH)3 (NH4)2SO4

Precipitation Reactions Know how to use the solubility rules (you will be given them on the exam). Know how to write equations from reactants (ionic reactants). Understand what solutions “look” like at a very magnified level.

Solubility Rules (Page 167) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride salts are soluble. Exceptions: Ag+ and Pb2+. Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+. Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+. Most sulfide, carbonate, and phosphate salts are only slightly soluble.

Clicker #3 How many combinations are expected to form precipitates? 0 (none) 1 2 3 (all) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride salts are soluble. Exceptions: Ag+ and Pb2+. Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+. Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+. Most sulfide, carbonate, and phosphate salts are only slightly soluble.