Warm-up Turn in your Specific Heat Lab!

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Presentation transcript:

Warm-up Turn in your Specific Heat Lab! Today you will need a periodic table and a calculator What is an exothermic reaction? What is an endothermic reaction?

Reaction Diagrams Enthalpy of Reactions

Exothermic Reactions Reactions that release heat energy Temperature of surroundings increases Heat is a product Enthalpy (ΔHrxn) is negative

Endothermic Reactions Reactions that absorb heat energy Temperature of surroundings decreases Heat is a reactant Enthalpy (ΔHrxn) is positive

Practice Problem 1 How much heat will be released if 1.0 g of hydrogen peroxide decomposes in a bombardier beetle to produce a steam spray? 2 H2O2 (l)  2 H2O (l) + O2 (g) + 190 kJ

Practice Problem 2 How much heat is transferred when 9.22 g of glucose in your body reacts with the oxygen you inhale according to the equation below? C6H12O6 (s) + 6 O2 (g)  6 CO2 + 6 H2O (l) ΔHrxn = -2803 kJ

Practice Problem 3 How much heat is released when 2.5 moles of NaOH are dissolved in water? NOTE: Dissolving is NOT a chemical reaction! ΔHsoln = -445.1 kJ/mol

Warm-up I have NO voice today! Please get settled when the bell rings and be quiet so everyone can hear me. Turn in your Phase Diagram Packet Read the Enthalpy of Reaction Lab procedures! Have your pre-lab out! (STAMP!)

Enthalpy of Reactions Lab It is very difficult for me to get your attention with not voice. For everyone’s safety, we will NOT be conducting a lab today. Instead, we will use sample data. Enthalpy PracticeDue Tomorrow LabDue Monday

Warm-up Write this on your warm-up sheet: Announcements *Test Corrections Due Friday. *Unit 8 Test Wednesday *Come to tutoring to get extra help on homework! 

Thermochemical Equations Practice Packet Questions about Enthalpy Practice? (Due Today) Problem examples in Reaction Diagrams notes (Enthalpy of Reaction). DUE MONDAY! Question 1c Amounts of two different reactants are given…. Must find the LIMITING REACTANT!

Summary… Enthalpy Practice: Due Now Specific Heat Lab: Due @ end of class. Fix Analysis if needed (you’re welcome ) Enthalpy of Reactions Pre-lab (1 question): Due tomorrow Thermalchemical Equations Practice Packet: Due Monday

Enthalpy of Reaction Lab You must wear goggles and aprons! Gloves Follow all directions carefully (read twice, pour once!!!!!) Keep one hand out the coffee cup calorimeter at all times!!!