The formation of chemical bonds from separated atoms 1. is never spontaneous. 2. increases entropy. 3. is always endothermic. 4. is always exothermic. 5. may be either endothermic or exothermic.

is always exothermic

Explanation:

You see, whether a process is endothermic or exothermic depends on the result of the operation; ΔHreaction= ΔHproducts - ΔHreactants.

If the enthalpy of reactants exceeds that of the products, then the process is exothermic.

We should remember that the energy of isolated atoms is always higher than the energy of the compound formed when the atoms bond together. Hence bond making is an exothermic process.

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