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Catalyst 3/1/12

Objectives IWBAT identify the characteristics of exothermic and endothermic IWBAT interpret a reaction energy diagram Agenda Catalyst Endo/ Exo Reaction Perform lab with understanding of heat transfer and endo / exo Practice Homework: none. Table of Contents on page 85

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Catalyst 3/1/12

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  1. Objectives • IWBAT identify the characteristics of exothermic and endothermic • IWBAT interpret a reaction energy diagram • Agenda • Catalyst • Endo/Exo Reaction • Perform lab with understanding of heat transfer and endo/exo • Practice • Homework: • none Table of Contents on page 85 Catalyst page 86 C F A E D B 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: 3 minutes left

  2. Objectives • IWBAT identify the characteristics of exothermic and endothermic • IWBAT interpret a reaction energy diagram • Agenda • Catalyst • Endo/Exo Reaction • Perform lab with understanding of heat transfer and endo/exo • Practice • Homework: • none Table of Contents on page 85 Catalyst page 86 C F A E D B 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 2 minutes left

  3. Objectives • IWBAT identify the characteristics of exothermic and endothermic • IWBAT interpret a reaction energy diagram • Agenda • Catalyst • Endo/Exo Reaction • Perform lab with understanding of heat transfer and endo/exo • Practice • Homework: • none Table of Contents on page 85 Catalyst page 86 C F A E D B 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: 1 minute left

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

  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. Whiteboard Practice The specific heat of aluminum is 0.890 J/goC. How much heat is transferred when a 545 g aluminum sample is heated from 29oC to 119 oC? ? (545)(0.890)(90)= 43654.5 J Q = m = Cp = ∆T = 545 g 0.890 J/goC 119 – 29 = 90 oC

  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 54oC. - 14,500 J Q = m = Cp = ∆T = 220 g 1.22 J/goC ? J/goC -54oC

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

  14. Whiteboard Practice Reactants Products N2 + 2O2 2NO2 • Calculate ΔH • Endo or Exothermic? 2(33.2) - (1(0)+ 2(0)) = 66.4 kJ/mol Products - Reactants Endothermic (+ΔH) Heat is gained

  15. Whiteboard Practice ΔH = 66.4 kJ/mol N2 + 2O2 2NO2 • Rewrite the equation with ΔH • Sketch a graph of what it would look like • 66.4 kJ + N2 + 2O22NO2

  16. Whiteboard Practice Reactants Products 4NH3(g)+ 7O24NO2(g)+ 6H2O(l) • ΔH • Endo or Exothermic? 4(33.2) + 6(-285.8) - (4(-46.1) + 7(0)) = Products - Reactants (-1714.8) - (-184.4)= -1530.4 kJ/mol -ΔH so Exothermic. Heat is being released.

  17. Whiteboard Practice ΔH = -1530.4 kJ/mol 4NH3(g)+ 7O2 4NO2(g)+ 6H2O(l) • Rewrite the equation with ΔH • Sketch a graph of what it would look like 4NH3(g)+ 7O24NO2(g)+ 6H2O(l)+1530.4 kJ

  18. 2(-601.7) + 2(0) - (2(-641.3) + 1(0)) = -1203.4 - (-1282.62)= 79.22 kJ/mol a. Determine the heat of reaction, ΔH, for this reaction. b. Write the chemical equation with heat value 79.22 kJ + 2MgCl2+ O2  2MgO + 2Cl2 2MgO + 2Cl2 2MgCl2 + O2 Products Reactants Products - Reactants

  19. Whiteboard Practice Which equation(s) could be represented by graph? • CH4+2 O2 CO2 + 2H2O + 890 kJ • 2NaHCO3 + 129 kJ Na2CO3+ H2O + CO2 • Ca(OH)2CaO + H2O ΔH= 65.2 kJ Exothermic Endothermic (heat is absorbed) Endothermic (heat is absorbed) -ΔH or kJ on Products side! Exothermic! Heat is released!

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