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Chemical Reactions, cont’d

Chemical Reactions, cont’d. Absorbs energy Releases energy. Exo thermic Reaction. Endo thermic Reaction. What happens to energy in a reaction?. Reactants  Products. Reaction energy (Q) = energy absorbed – energy released. Single bonds energies (kJ/ mol ).

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Chemical Reactions, cont’d

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  1. Chemical Reactions, cont’d

  2. Absorbs energy Releases energy Exothermic Reaction Endothermic Reaction

  3. What happens to energy in a reaction? Reactants  Products Reaction energy (Q) = energy absorbed – energy released

  4. Single bonds energies (kJ/mol)

  5. How much energy is contained in the bonds of the following molecules? CH4 H2O NH3

  6. Double and triple bonds energies (kJ/mol)

  7. What are some examples of endothermic and exothermic reactions?

  8. + 686 kJ CH4 + 2 O2 CO2 + 2 H2O • How much energy is absorbed to break the bonds of the reactants during the chemical reaction? • How much energy is released in the formation of the products? • What is the reaction energy (Q)? • Is this reaction endothermic or exothermic?

  9. Energy (kJ)

  10. 2 H2O  2 H2 + O2 • How much energy is absorbed to break the bonds of the reactants during the chemical reaction? • How much energy is released in the formation of the products? • What is the reaction energy (Q)? • Is this reaction endothermic or exothermic?

  11. N2 + 3 H2  2 NH3 HCCH + 2 HF  CH3CHF2 2 H2O + O2  2 H2O2

  12. N2 + 3 H2  2 NH3

  13. HCCH + 2 HF  CH3CHF2

  14. 2 H2O + O2  2 H2O2

  15. Combining reaction energy & stoichiometryN2+ 2 O2+ 67.7 kJ  2 NO2 What amount of energy is required to produce 8 moles of NO2?

  16. Combining reaction energy & stoichiometryCH4+ 2 O2 CO2 + 2 H2O + 686 kJ How much energy will be produced by the above reaction if 32 g of methane (CH4) react?

  17. Combining reaction energy & stoichiometryC + O2 CO2 + 393.5 kJ The complete combustion of 1 mole of carbon releases 393.5 kJ of energy. To obtain 1000 kJ of energy, what mass of carbon will need to be burned?

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