Is bond breaking endothermic or exothermic?
Bond breaking is endothermic because energy is required to break bonds.
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Is bond forming endothermic or exothermic?
Bond formation is exothermic because energy is released when new bonds are formed.
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What is the formula for calculating the energy change of a reaction using bond energies?
(energy required to break bonds) - (energy released by forming bonds)
or, in more words:
(energy required to break the bonds of the reactants) - (energy released by forming the bonds of the products)
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Outline the required steps for bond energy calculations.
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If a chemical reaction has a negative energy change, is it an exothermic or endothermic reaction?
Exothermic.
A negative energy change means the products have less energy than the reactants, meaning energy has been released to the surroundings, so the reaction is exothermic.
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