Thermochemical Equations

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Presentation transcript:

Thermochemical Equations Ch 13 Lesson 2 Tracking Energy Through a Reaction

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

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

Thermochemical Equation Knowing the heat of reaction for the burning of methane is -802kJ per mole, how much energy is released when 0.281 moles of methane is burned? The negative sign (exothermic) indicates that 225.5 kJ of energy are given off by the system into the surroundings.

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 225.5 kJ of energy are given off by the system into the surroundings.

Practice Problems