Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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**Image Transcription for Educational Website:** The image illustrates an energy diagram for the combustion of methane: 1. **Chemical Reaction:** - Reactants: CH₄(g) + 2 O₂(g) - Products: CO₂(g) + 2 H₂O(g) 2. **Energy Changes:** - The reaction has an enthalpy change (ΔHᵣₓₙ) of -809.0 kJ/mol, indicating that energy is released. - There is an additional step where the gaseous water (2 H₂O(g)) condenses to liquid water (2 H₂O(l)), with an enthalpy change (ΔHₕₒₙᵈ) of -81.3 kJ. 3. **Diagram Description:** - The diagram includes two horizontal lines: one representing the energy level of the reactants and another lower line for the energy level of the products. - Arrows indicate the transition from reactants to products and from gaseous to liquid water, both pointing downward, symbolizing the release of energy. 4. **Question:** "Given the energy diagram above (F16-1-3 in the eBook), is the combustion of methane exothermic or endothermic?" 5. **Answer Options:** - endothermic - exothermic - it could be either The diagram clearly shows that the combustion of methane is an exothermic process, as indicated by the negative enthalpy changes and the downward arrows showing the release of energy.
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Transcribed Image Text:**Image Transcription for Educational Website:** The image illustrates an energy diagram for the combustion of methane: 1. **Chemical Reaction:** - Reactants: CH₄(g) + 2 O₂(g) - Products: CO₂(g) + 2 H₂O(g) 2. **Energy Changes:** - The reaction has an enthalpy change (ΔHᵣₓₙ) of -809.0 kJ/mol, indicating that energy is released. - There is an additional step where the gaseous water (2 H₂O(g)) condenses to liquid water (2 H₂O(l)), with an enthalpy change (ΔHₕₒₙᵈ) of -81.3 kJ. 3. **Diagram Description:** - The diagram includes two horizontal lines: one representing the energy level of the reactants and another lower line for the energy level of the products. - Arrows indicate the transition from reactants to products and from gaseous to liquid water, both pointing downward, symbolizing the release of energy. 4. **Question:** "Given the energy diagram above (F16-1-3 in the eBook), is the combustion of methane exothermic or endothermic?" 5. **Answer Options:** - endothermic - exothermic - it could be either The diagram clearly shows that the combustion of methane is an exothermic process, as indicated by the negative enthalpy changes and the downward arrows showing the release of energy.
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