Creating a Positive Learning Environment for Everyone Be respectful of your classmates Save conversation for clicker portions of lecture Put cell phones in “airplane” mode Turn off tablets Close laptops

Announcements Bring handout from Tuesday to discussion tomorrow. Textbook homework due tomorrow. Lab write-up due Wed. Oct 18. (If your lab was cancelled yesterday, you will do the activity in discussion tomorrow.) Electronic Homework #4 due Monday, 10/16 (Type I) and Wednesday, 10/18 (Type II) by 7:00pm

What do you call a tooth in a glass of water? A one molar solution….

Clicker #1 How many cars can we make? A) 3 B) 4 C) 6 D) 12 E) 16

Stoichiometry Calculate amounts of reactants or products given an amount of reactant or product. We need to compare what we are given to the mole ratio that reacts (have vs. need) We need a balanced equation (gives us the ratios). Coefficients give us the amount we need (# moles or # particles).

Solids, Solutions, and Gases NaHCO3(s) + HC2H3O2(aq) → NaC2H3O2 (aq) + H2O(l) + CO2(g) Which balloon will be the biggest? Trial # Mass of NaHCO3 Volume of 0.833 M HC2H3O2 1 3.30 g 150.0 mL 2 5.70 g 3 10.5 g 4 21.0 g 5 31.8 g

Clicker #2 If you have 8 moles of hydrogen and all the oxygen you need, how many moles of water can you make? 2H2 + O2 → 2H2O A) 1 mol B) 2 mol C) 4 mol D) 8 mol E) 16 mol

Clicker #3 If you have 6 moles of oxygen and all the hydrogen you need, how many moles of water can you make? 2H2 + O2 → 2H2O A) 1 mol B) 2 mol C) 3 mol D) 6 mol E) 12 mol

Clicker #4 If you have 8 moles of hydrogen and 6 moles of oxygen, how many moles of water can you make? 2H2 + O2 → 2H2O A) 6 mol B) 8 mol C) 12 mol D) 14 mol E) 16 mol

Starting with Mass… If you have 48.0 g of oxygen and all the hydrogen you need, what mass of water is produced? 2H2 + O2 → 2H2O

Example #1 N2 + 3 H2  2 NH3 168.12 g N2 reacts with 12.096 g H2 What mass of NH3 is produced?

Clicker #5 If we have 6 moles of nitrogen, how many moles of hydrogen are needed to react? N2 + 3H2 → 2NH3 A) 2 mol B) 3 mol C) 6 mol D) 12 mol E) 18 mol

Example #2 N2 + 3 H2  2 NH3 10.0 g N2 reacts with 10.0 g H2 What mass of NH3 is produced? How much (in grams) of which reactant is leftover?