Chemistry Learning Center 230 Davenport Hall Chemistry TAs available from 9 am – 5pm Mondays – Fridays. Chemistry 202 TAs in the CLC: Mondays: 11am-1pm,

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Chemistry Learning Center 230 Davenport Hall Chemistry TAs available from 9 am – 5pm Mondays – Fridays. Chemistry 202 TAs in the CLC: Mondays: 11am-1pm, 3pm-5pm Wednesdays: 3pm-5pm Thursdays: 3pm-5pm 1

Lon-Capa 1 st HW assignment due Friday, 9/4, 5 pm. It is open now. 1 st Quiz due Sunday, 9/6 by 10 pm. It will open Wednesday, 9/2 at 5 pm. 2

For Wednesday Continue working on Lon-Capa. Finish reading Chapter 4 and doing the Chapter 4 homework. See me or me if there are any questions or concerns. 3

A Complex Problem Baking soda (sodium bicarbonate) decomposes upon heating to form sodium carbonate, water vapor, and carbon dioxide. Sodium carbonate does not decompose further at this temperature. You have a g mixture of baking soda and sodium carbonate and heat it until completion. After heating you are left with 8.97 g of solid. Determine the mass percent of baking soda in the original mixture. 4

Chapter 3: #114 Consider a gaseous binary compound with a molar mass of g/mol. When 1.39 g of this compound is completely burned in excess oxygen, 1.21 g of water is formed. Determine the formula of the compound. 5

Chapter 3: #112 A 2.25-g sample of scandium metal is reacted with excess hydrochloric acid to produce g hydrogen gas. What is the formula of the scandium chloride produced in the reaction? 6

Formulas for Ionic Compounds are Empirical Formulas 7

NaCl Dissolves 8

p129 9

Solubility Rules 10

p130 11

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. 12

Clicker Question When lead(II) nitrate and potassium iodide are mixed, which are the possible products? 1.PbI 2.PbI 2 3.K(NO 3 ) 2 4.KNO 3 a) 1 & 3b) 1 & 4c) 2 & 4d) 2 & 3 13