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Chemistry Unit Six PRACTICE – Energy and Chemical Changes – Part I 1. Label each area on the reaction diagram with the appropriate letters listed below. Not all letters will be used. A. reactants B. products C. ∆H D. activation energy (Ea) E. activation complex F. energy absorbed PE (kJ) G. energy released Reaction Pathway For #2-5, specify whether each reaction is exothermic (EXO) or endothermic (ENDO). 2. ________ The reaction shown in the diagram above. 3. ________ Steam rising from the shower. 4. ________ 4Fe(s) + 3O2(g) → 2Fe2O3(s) + energy 5. ________ A test tube that feels cold to the touch after two substances have been mixed. 6. Using Hess’s Law, calculate the heat of reaction for the following reaction: CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) CH4 O2 CO2 H2O(g) ∆Hf° ∆Hf° ∆Hf° ∆Hf° = - 17.9kJ/mol = 0kJ/mol = - 393.5kJ/mol = - 241.8kJ/mol 7. Calculate the heat given off when one mole of B5H9 reacts with excess O2 according to the following reaction: 2B5H9(g) + 12O2(g) → 5B2O3(g) + 9H2O(g) Compound B5H9(g) B2O3(g) O2(g) H2O(g) Hf° (kJ/mol) 73.2 -1272.77 0 -241.82 Answer the following questions using the energy diagram below. 8. __________________ Is the forward reaction represented by the curve exothermic or endothermic? 9. ___________________ Estimate the magnitude and sign of H. 10. __________________ Estimate E a' .