Predict the sign of the entropy change for a reaction or process

1. A.
   $\text{CaO(s)}+\text{CO}_2\text{(g)}\longrightarrow\text{CaCO}_3\text{(s)}$
2. B.
   $\text{NaCl(aq)}\longrightarrow\text{NaCl(s)}$
3. C.
   $\text{NaNO}_3\text{(s)}\longrightarrow\text{Na}^+\text{(aq)}+\text{NO}_3^-\text{(aq)}$
4. D.
   $\text{N}_2\text{(g)}+3\text{H}_2\text{(g)}\longrightarrow 2\text{NH}_3\text{(g)}$

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1. A.
   $2H_{2}O_{2(l)} \longrightarrow 2H_{2}O_{(l)} + O_{2(g)}$
2. B.
   $H_{2(g)} \longrightarrow 2H_{(g)}$
3. C.
   ${CaCO}_{3(s)}\xrightarrow{\Delta}{CaO}_{(s)} + {CO}_{2(g)}$
4. D.
   $2H_{2(g)} + O_{2(g)} \longrightarrow 2H_{2}O_{(l)}$

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

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1. A.
   Dissolving Sugar in Water
2. B.
   Adsorption of a Gas on a Solid Surface
3. C.
   $2\mathrm{NH_3}(g) \rightarrow \mathrm{N_2}(g) + 3\mathrm{H_2}(g)$
4. D.
   Sublimation of Dry Ice

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