Today is Monday, December 19th, 2016

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Presentation transcript:

Today is Monday, December 19th, 2016 Pre-Class: We’re spending a large portion of today reviewing for the test tomorrow. Ask questions now or forever hold them or something... THINGS TO DO: -Have the Specific Heat and Thermochemistry Round Robin Review worksheets out.

Today’s Agenda Review. Review? Review!

Before we do class questions… Class, do you have any questions?

Worksheet Practice Specific Heat Worksheet 7, 9 (only if you haven’t already) Thermochemistry Round Robin Review 14, 16 Thermochemistry Problems Worksheet One 21-23, 1-7

Review Question 1 When do you use the equation ΔH = m*Cp*ΔT? When temperature is changing but not phase.

Review Question 2 When do you use ΔH = mol*ΔHfus/vap? When phase is changing but not temperature.

Review Question 3 Convert 458 calories to joules. 1916.272 joules 1 calorie = 4.184 Joules 458 calories * 4.184 Joules 1 calorie

Review Question 4 If you are heating water from -15°C to 79°C, how many “steps” would the problem require to solve? 3 Warming the solid Melting the solid Warming the liquid

Review Question 5 How much heat energy is required to raise the temperature of 74.7g of pyrex glass by 43°C? The specific heat capacity of pyrex is 0.837 J/g °C. 2688.53 J ΔH = m*Cp*ΔT ΔH = 74.7*0.837*(43) ΔH = 2688.53 J

Review Question 6 How many torr are in 533 mm Hg? 533 torr

Review Question 7 How many kPa are in 3.200 atm? 324.2 kPa

Review Question 8 How many kPa are in 52.1 torr? 6.94 kPa

Review Question 9 BONUS NON-CHEMISTRY QUESTION You may wager any/all of your points. Category: Geography Montevideo is the capital of which country? Uruguay.

Review Question 10 Given the following reaction: 2CO2 + 2H2O  C2H4 + 3O2 ΔH = 1410.7 kJ How much energy is needed to produce 36 g of oxygen gas? 529.01 kJ 36 g O2 = 1.125 mol O2 1.125 mol * 1410.7 kJ 3 mol O2

Review Question 11 Would it be good for a student to not study Hess’s Law for the coming test? No. It wouldn’t. It would also be impossible for a teacher to put a lengthy-type question as that into a review like this. So instead, here’s a reminder to study it.

Review Question 12 What is the ΔHf0 of O2? 0 kJ/mol. Remember that free/diatomic (basically anything in its natural state) elements have no heat of formation.

Review Question 13 How do you calculate ΔHf0 for a reaction? Add up the ΔHf0 values for the products and then subtract the ΔHf0 values for the reactants, making sure to adjust for mol totals.