1 Question of the Day A solution containing 3.50 g sodium phosphate is mixed with a solution containing 6.40 g barium nitrate. After the reaction is complete, 4.85 g barium phosphate are collected. 1. What is the limiting reagent? 2. What is the theoretical yield of barium phosphate? 3. What is the percent yield of barium phosphate? 2Na 3 PO 4(aq) + 3Ba(NO 3 ) 2(aq)  6NaNO 3(aq) + Ba 3 (PO 4 ) 2(s) molar masses: Na 3 PO 4 = Ba(NO 3 ) 2 = Ba 3 (PO 4 ) 2 = Day

Example # 2: What is the percent yield if 4.65 grams of copper is produced when 1.87 grams of aluminum reacts with an excess of cupric chloride? ANSWER = 70.5% Notes page 4

Reactions that release heat are called…and feel Reactions that absorb heat are called… and feel Exothermic hot Endothermic cold Heat is a form of energy and therefore measured in Joules (J) or kilojoules (kJ)

Where does the heat involved with reactions come from?

Reactions that release heat are called…and feel Reactions that absorb heat are called… and feel Exothermic hot Endothermic cold C 3 H 8 + 5O 2  3CO 2 + 4H 2 O kJ C + H 2 O kJ  CO + H 2

Enthalpy – a way to measure the heat absorbed or released in a reaction - takes into account pressure and volume

Kinetic Theory – Heat results from the motion and vibration of particles of matter Heat = the transfer of kinetic energy from a hotter object to a colder object particle collisions are the key leads to properties of gases

Avogadro’s # Stoichiometry Molar mass Ion 22.4 liters Mole ratio 6.022e23 Isotope Balanced Avogadro’s law

Review sections 12.1 and 12.2 and complete #s 5, 6, 9, and 10 on page 389, # 12 on page 391, and # 14 on page 393 Complete #s on page 398 ALL due Friday Assignment

At STP 44.8 liters of water vapor were produced via a composition (synthesis) reaction. How many moles of O 2 were used? Day period 3

Day At STP 44.8 liters of water vapor were produced via a composition (synthesis) reaction. How many grams of H 2 were used?

1.Is the reaction below exothermic or endothermic? How do you know? 2.If we wanted 2 moles of C to react how much heat energy would need to be added? C + H 2 O kJ  CO + H 2 Day

Go to /2/660/ cw/index.html Choose chapter 3, click problem solving center on the left, click and complete homework 4, click submit answers for grading, complete homework 4 as many times as you want to until you score a 100%. When you score a 100% raise your hand and show me your summary screen. /2/660/ cw/index.html

18 Assignment Page 411 #s 41, 44, 46 (part a only), 49, 53, 58, 60

19 Question of the Day A solution containing 3.50 g sodium phosphate is mixed with a solution containing 6.40 g barium nitrate. After the reaction is complete, 4.85 g barium phosphate are collected. 1. What is the limiting reagent? 2. What is the theoretical yield of barium phosphate? 3. What is the percent yield of barium phosphate? Day

20 Question of the Day A solution containing 3.50 g sodium phosphate is mixed with a solution containing 6.40 g barium nitrate. After the reaction is complete, 4.85 g barium phosphate are collected. 1. What is the limiting reagent? 2. What is the theoretical yield of barium phosphate? 3. What is the percent yield of barium phosphate? Day