Catalyst 3/1/12
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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 characterist ics of exothermic and endothermic - IWBAT interpret a reaction energy diagram Agenda 1. Catalyst 2. Endo/Exo Reaction 3. Perform lab with understandi ng of heat transfer and endo/exo 4. Practice Table of Contents on page 85 Catalyst page 86 3 minutes left A B C D E F
description
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 - PowerPoint PPT Presentation
Transcript of Catalyst 3/1/12
Catalyst 3/1/12Match 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. Catalyst2. Endo/Exo
Reaction3. Perform lab with
understanding of heat transfer and endo/exo
4. Practice
Homework:none
Table of Contents on page 85Catalyst page 86
3 minutes left
A
B
C
D
E
F
Catalyst 3/1/12Match 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. Catalyst2. Endo/Exo
Reaction3. Perform lab with
understanding of heat transfer and endo/exo
4. Practice
Homework:none
Table of Contents on page 85Catalyst page 86
2 minutes left
A
B
C
D
E
F
Catalyst 3/1/12Match 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. Catalyst2. Endo/Exo
Reaction3. Perform lab with
understanding of heat transfer and endo/exo
4. Practice
Homework:none
Table of Contents on page 85Catalyst page 86
1 minute left
A
B
C
D
E
F
Catalyst 3/1/12Match 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. Catalyst2. Endo/Exo
Reaction3. Perform lab with
understanding of heat transfer and endo/exo
4. Practice
Homework:none
Table of Contents on page 85Catalyst page 86
Catalyst Checkers!
A
B
C
D
E
F
E. Enthalpy ChangeD. Energy
of Reactants
F. Activation Energy
A. Heat Energy kJ
B. Progress of Rxn (Time)
C. Energy of Products
Amazing Science!
• You can be a pioneer in a field 40 years from now
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.
Specific Heat can be defined as:
the amount of heat per unit mass required to raise the temperature by one degree Celsius.
Thermal Equation
Q = (m)( ΔT)(Cp) or
Heat Gained or Lost = (Mass) x (Change in Temperature) x (Specific Heat)
Water’s Specific Heat
1 calorie/gram °C = 4.186 joule/gram °C = 1 Calorie/ kilogram °C
Whiteboard Practice
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?
Q =m =Cp =∆T = 119 – 29 = 90 oC
?545 g0.890 J/goC
(545)(0.890)(90)= 43654.5 J
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.
Q =m =Cp =∆T =
? J/goC -54oC
220 g - 14,500 J
1.22 J/goC
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?
Q =m =Cp =∆T =
0.4494 J/goC 13 – 180 = -167oC
247 g? J-18537 J
Whiteboard Practice
N2 + 2O2 2NO2
a. Calculate ΔHb. Endo or Exothermic?
Endothermic (+ΔH)Heat is gained
Products - Reactants2(33.2) - (1(0)+ 2(0)) = 66.4 kJ/mol
ProductsReactants
Whiteboard Practice
N2 + 2O2 2NO2
• Rewrite the equation with ΔH• Sketch a graph of what it would look like
66.4 kJ + N2 + 2O2 2NO2
ΔH = 66.4 kJ/mol
Whiteboard Practice
4NH3(g)+ 7O2 4NO2(g)+ 6H2O(l)
a. ΔHb. 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)) =
Whiteboard Practice
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
ΔH = -1530.4 kJ/mol
a. Determine the heat of reaction, ΔH, for this reaction.
b. Write the chemical equation with heat value
2MgCl2 + O2
2MgO + 2Cl2
2(-601.7) + 2(0) - (2(-641.3) + 1(0)) = -1203.4 - (-1282.62)= 79.22 kJ/mol
79.22 kJ + 2MgCl2 + O2 2MgO + 2Cl2
ProductsReactants Products - Reactants
Whiteboard PracticeWhich equation(s) could be represented by graph?A. CH4 +2 O2 CO2 + 2H2O + 890 kJB. 2NaHCO3 + 129 kJ Na2CO3 + H2O + CO2
C. Ca(OH)2 CaO + H2O ΔH= 65.2 kJ
Exothermic!Heat is released!
-ΔH or kJ on Products side!
ExothermicEndothermic (heat is absorbed)
Endothermic (heat is absorbed)
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