1. Thermochemical Equations
Ch 13 Lesson 2
Tracking Energy Through a Reaction

2. Endothermic and Exothermic: Match the Picture, the Graph and the Symbol
Feels Cold
+ΔH
Feels Hot
-ΔH

3. Combustion of Methane CH4 + 2 O2 -> CO2 + 2 H2O + energy
CONCEPT QUESTIONS
Endothermic or Exothermic?
+ΔH or - ΔH ?

4. Thermochemical Equation
Knowing the heat of reaction for the burning of methane is -802kJ per mole, how much energy is released when moles of methane is burned?
The negative sign (exothermic) indicates that kJ of energy are given off by the system into the surroundings.

5. Thermochemical Equation
How much heat energy is released when 4.5 grams of methane is burned (heat of reaction is -802kJ per mole) ?
The negative sign (exothermic) indicates that kJ of energy are given off by the system into the surroundings.

6. Practice Problems