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Section 4 d

Section 4 d. Breaking and making bonds. Bond energies. The table below shows the amount of energy needed to break the bond and the amount of energy released when that bond is made. s ample calculation. CH 4 ( g ) + 2O 2 ( g )  CO 2 ( g ) + 2H 2 O ( g )

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Section 4 d

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  1. Section 4 d Breaking and making bonds

  2. Bond energies • The table below shows the amount of energy needed to break the bond and the amount of energy released when that bond is made

  3. sample calculation CH4(g) + 2O2 (g)  CO2 (g) + 2H2O (g) ΔH = bonds broken – bonds made = 2640 – 3338 = - 700 kJ

  4. Energy level diagram - exothermic • The energy level diagram below includes the energy taken into break bonds and the energy released when making new ones

  5. Same energy level diagram

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