Identify an exothermic or endothermic process

1. A.
   ${KOH}_{(aq)} + {HNO}_{3(aq)} \longrightarrow {KNO}_{3(aq)} + H_{2}O$
2. B.
   $H_{2}O_{(s)} \longrightarrow H_{2}O_{(l)}$
3. C.
   ${NaCl}_{(s)} + aq \longrightarrow {Na}_{(aq)}^{+} + {Cl}_{(aq)}^{-}$
4. D.
   $N_{2(g)} + 2O_{2(g)} \longrightarrow 2{NO}_{2(g)}$

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1. A.
   $\ H_{2}O_{(\mathcal{l})} \rightarrow H_{2}O_{(s)}$
2. B.
   $\ H_{2}O_{(s)} \rightarrow H_{2}O_{(\mathcal{l})}$
3. C.
   $H_{2}O_{(g)} \rightarrow H_{2}O_{(\mathcal{l})}$
4. D.
   $\ H_{2}O_{(g)} \rightarrow H_{2}O_{(s)}$

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1. A.
   The aqueous NaOH and HCl solutions mixed together.
2. B.
   Formation of ammonia by Haber process.
3. C.
   Ice melts at room temperature.
4. D.
   The freezing of liquid water.

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1. A.
   Enthalpy of fusion
2. B.
   Enthalpy of condensation
3. C.
   Enthaly of vaporization
4. D.
   Enthalpy of sublimation

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1. A.
   $\mathrm{Na_{(g)} \rightarrow Na^+_{(g)}}$
2. B.
   $\mathrm{Cl_{(g)} \rightarrow Cl^-_{(g)}}$
3. C.
   $\mathrm{Cl_{2(g)} \rightarrow Cl_{(g)} + Cl_{(g)}}$
4. D.
   $\mathrm{NaCl_{(s)} + aq. \rightarrow Na^+_{(aq)} + Cl^-_{(aq)}}$

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