CH-1250
Bond energies
Chemistry · Secondary 4 · Hard · Bond energies
Hydrogen burns in oxygen to form water:
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In terms of bond energies, which statement correctly explains why the enthalpy change for this reaction is negative?
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In terms of bond energies, which statement correctly explains why the enthalpy change for this reaction is negative?
- More energy is released when O–H bonds are formed than is absorbed when H–H and O=O bonds are broken.
- More energy is absorbed when H–H and O=O bonds are broken than is released when O–H bonds are formed.
- Equal amounts of energy are absorbed in breaking bonds and released in making bonds.
- No energy is absorbed in breaking bonds; all the energy change comes from making bonds.
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