Of the bonds listed below the weakest bond is _______ and the strongest is ________.
A strong bond is a (stable / unstable) bond
2(H—C ≡ C—H) + 5(O = O) → 4 (O—C—O) + 2 (H—O—H)
839 kJ/mol C ≡ C # of bonds ______ (product / reactant) side Energy:_____
495 kJ/mo O = O # of bonds ______ (product / reactant) side Energy:_____
413 kJ/mo C—H # of bonds ______ (product / reactant) side Energy:_____
358 kJ/mo C—O # of bonds ______ (product / reactant) side Energy:_____
467 kJ/mo H—O # of bonds ______ (product / reactant) side Energy:_____
Add the energies on the reactant side __________ kJ/mol
Add the energies on the product side __________ kJ/mol
This reaction is (exothermic / endothermic)
The reaction (produces / absorbs) __________ kJ when ____ moles of acetylene (C2H2) reacts.
A pile of firewood is more stable as ash and smoke than firewood.
Why does this pile of firewood not immediately release the energy in
Its chemical bonds? (use the word activation energy in your answer)
The weakest bond is the C—H bond and the strongest bond is the C ≡ C bond.
A strong bond is a stable bond.
2(H—C ≡ C—H) + 5(O = O) → 4 (O—C—O) + 2 (H—O—H)
839 kJ/mol C ≡ C # of bonds: 2 (reactant) side Energy: 2*839 = 1678 kJ/mol
495 kJ/mo O = O # of bonds: 5 (reactant) side Energy: 5*495 = 2475 kJ/mol
413 kJ/mo C—H # of bonds: 2 (reactant) side Energy: 2*413 = 826 kJ/mol
358 kJ/mo C—O # of bonds: 4 (product) side Energy: 4*358 = 1432 kJ/mol
467 kJ/mo H—O # of bonds: 2 (product) side Energy: 2*467 = 934 kJ/mol
Energy on the reactant side: 1678 + 2475 + 826 = 4979 kJ/mol
Energy on the product side: 1432 + 934 = 2366 kJ/mol
This reaction is exothermic.
The reaction produces 2613 kJ when 2 moles of acetylene (C2H2) reacts.
A pile of firewood does not immediately release the energy in its chemical bonds because it requires activation energy to initiate the reaction. Activation energy is the minimum amount of energy needed to start a chemical reaction. In the case of a pile of firewood, the activation energy is not readily available, so the energy in the bonds is not immediately released.