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Designate the following changes as exoth...

Designate the following changes as exothermic or endothermic: (1) `A(g)to A^(+)(g)+e^(-)`
(2) `B(g)+e to B^(-)(g)`
(3) `X(s) toX(g)`
(4) `A^(+)(g)+B^(-)(g) to AB`

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(1) and (3): endothermic, (2) and (4) exothermic.
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