1. Catalyst 3/1/12 Match 6 terms to graph Enthalpy Change (ΔH) Energy of Reactants Activation Energy Heat/Energy(kJ): Progress of Rxn (Time) Energy of Products: Objectives -IWBAT identify the characteristics of exothermic and endothermic -IWBAT interpret a reaction energy diagram Agenda 1.Catalyst 2.Endo/Exo Reaction 3.Perform lab with understanding of heat transfer and endo/exo 4.Practice Homework: none Table of Contents on page 85 Catalyst page 86 3 minutes left A B C D E F

2. Catalyst 3/1/12 Match 6 terms to graph Enthalpy Change (ΔH) Energy of Reactants Activation Energy Heat/Energy(kJ) Progress of Rxn (Time) Energy of Products Objectives -IWBAT identify the characteristics of exothermic and endothermic -IWBAT interpret a reaction energy diagram Agenda 1.Catalyst 2.Endo/Exo Reaction 3.Perform lab with understanding of heat transfer and endo/exo 4.Practice Homework: none Table of Contents on page 85 Catalyst page 86 2 minutes left A B C D E F

3. Catalyst 3/1/12 Match 6 terms to graph Enthalpy Change (ΔH) Energy of Reactants Activation Energy Heat/Energy(kJ) Progress of Rxn (Time) Energy of Products: Objectives -IWBAT identify the characteristics of exothermic and endothermic -IWBAT interpret a reaction energy diagram Agenda 1.Catalyst 2.Endo/Exo Reaction 3.Perform lab with understanding of heat transfer and endo/exo 4.Practice Homework: none Table of Contents on page 85 Catalyst page 86 1 minute left A B C D E F

4. Catalyst 3/1/12 Match 6 terms to graph Enthalpy Change (ΔH) Energy of Reactants Activation Energy Heat/Energy(kJ) Progress of Rxn (Time) Energy of Products Objectives -IWBAT identify the characteristics of exothermic and endothermic -IWBAT interpret a reaction energy diagram Agenda 1.Catalyst 2.Endo/Exo Reaction 3.Perform lab with understanding of heat transfer and endo/exo 4.Practice Homework: none Table of Contents on page 85 Catalyst page 86 Catalyst Checkers! A B C D E F E. Enthalpy Change D. Energy of Reactants F. Activation Energy A. Heat Energy kJ B. Progress of Rxn (Time) C. Energy of Products

5. Amazing Science! You can be a pioneer in a field 40 years from now

6. Page 91 Feel the top of your desk. Then feel your chair leg. Noticing how they feel different, write down your explanation using specific heat. Hint: think of specific heat’s unit (J/g˚C) and how much energy it takes to change the temperature.

7. Specific Heat can be defined as: the amount of heat per unit mass required to raise the temperature by one degree Celsius.

8. Thermal Equation Q = (m)( ΔT)(Cp) or Heat Gained or Lost = (Mass) x (Change in Temperature) x (Specific Heat)

9. Water’s Specific Heat 1 calorie/gram °C = 4.186 joule/gram °C = 1 Calorie/ kilogram °C

10. Whiteboard Practice

11. The specific heat of aluminum is 0.890 J/g o C. How much heat is transferred when a 545 g aluminum sample is heated from 29 o C to 119 o C? Q = m = C p = ∆T = 119 – 29 = 90 o C ? 545 g 0.890 J/g o C (545)(0.890)(90)= 43654.5 J

12. Whiteboard Practice Determine the specific heat of a certain metal if a 220 gram sample of it loses 14,500 Joules of heat as its temperature drops by 54 o C. Q = m = C p = ∆T = ? J/g o C -54 o C 220 g - 14,500 J 1.22 J/g o C

13. Whiteboard Practice The specific heat of iron is 0.4494 J/g o C. How much heat is transferred when a 247 g iron sample is cooled from 180 o C to 13 o C? Q = m = C p = ∆T = 0.4494 J/g o C 13 – 180 = -167 o C 247 g ? J-18537 J

14. Whiteboard Practice N 2 + 2O 2  2NO 2 a.Calculate ΔH b.Endo or Exothermic? Endothermic (+ΔH) Heat is gained Products - Reactants 2(33.2) - (1(0)+ 2(0)) = 66.4 kJ/mol ProductsReactants

15. Whiteboard Practice N 2 + 2O 2  2NO 2 Rewrite the equation with ΔH Sketch a graph of what it would look like 66.4 kJ + N 2 + 2O 2  2NO 2 ΔH = 66.4 kJ/mol

16. Whiteboard Practice 4NH 3(g) + 7O 2  4NO 2(g) + 6H 2 O (l) a.ΔH b.Endo or Exothermic? (-1714.8) - (-184.4)= -1530.4 kJ/mol - ΔH so Exothermic. Heat is being released. Products - Reactants ProductsReactants 4(33.2) + 6(-285.8) - (4(-46.1) + 7(0)) =

17. Whiteboard Practice 4NH 3(g) + 7O 2  4NO 2(g) + 6H 2 O (l) Rewrite the equation with ΔH Sketch a graph of what it would look like 4NH 3(g) + 7O 2  4NO 2(g) + 6H 2 O (l) +1530.4 kJ ΔH = -1530.4 kJ/mol

18. a. Determine the heat of reaction, ΔH, for this reaction. b. Write the chemical equation with heat value 2MgCl 2 + O 2 2MgO + 2Cl 2 2(-601.7) + 2(0) - (2(-641.3) + 1(0)) = -1203.4 - (-1282.62)= 79.22 kJ/mol 79.22 kJ + 2MgCl 2 + O 2  2MgO + 2Cl 2 Products Reactants Products - Reactants

19. Whiteboard Practice Which equation(s) could be represented by graph? A.CH 4 +2 O 2  CO 2 + 2H 2 O + 890 kJ B.2NaHCO 3 + 129 kJ  Na 2 CO 3 + H 2 O + CO 2 C.Ca(OH) 2  CaO + H 2 O ΔH= 65.2 kJ Exothermic! Heat is released! -ΔH or kJ on Products side! Exothermic Endothermic (heat is absorbed)