For each chemical reaction listed in the first column of the table below, predict the sign (positive or negative) of the reaction entropy ASxn. If it's not possible to decide with the information given, check the "not enough information" button in the last column. Note for advanced students: Assume the temperature remains constant. Assume all gases and solutions are ideal. reaction Ag (aq) + Cl (aq) Ag Cl (s) C₂H₂ (g) + 2H₂(g) → C₂H₂(g) MgCl₂ (s) + H₂O (1)→ MgO (s) + 2HCl (g) sign of reaction entropy O AS OASxn O rxn O <0 > 0 enough information. O AS <0 rxn OASxn > 0 enough information. O AS < 0 rxn X Ο ΔS > 0 rxn O not enough information. S

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**Predicting the Sign of Reaction Entropy**

For each chemical reaction listed in the first column of the table below, predict the sign (positive or negative) of the reaction entropy \(\Delta S_{\text{rxn}}\). If it's not possible to decide with the information given, check the "not enough information" option in the last column.

**Note for advanced students:** Assume the temperature remains constant. Assume all gases and solutions are ideal.

| **Reaction**                           | **Sign of Reaction Entropy**                        |
|----------------------------------------|----------------------------------------------------|
| \( \text{Ag}^+ \, (aq) + \text{Cl}^- \, (aq) \rightarrow \text{AgCl} \, (s) \) | ○ \(\Delta S_{\text{rxn}} < 0\)  <br> ○ \(\Delta S_{\text{rxn}} > 0\)  <br> ○ not enough information. |
| \( \text{C}_2\text{H}_2 \, (g) + 2\text{H}_2 \, (g) \rightarrow \text{C}_2\text{H}_6 \, (g) \) | ○ \(\Delta S_{\text{rxn}} < 0\)  <br> ○ \(\Delta S_{\text{rxn}} > 0\)  <br> ○ not enough information. |
| \( \text{MgCl}_2 \, (s) + \text{H}_2\text{O} \, (l) \rightarrow \text{MgO} \, (s) + 2\text{HCl} \, (g) \) | ○ \(\Delta S_{\text{rxn}} < 0\)  <br> ○ \(\Delta S_{\text{rxn}} > 0\)  <br> ○ not enough information. |

To decide the sign of the reaction entropy \(\Delta S_{\text{rxn}}\), consider the change in the number and states of the reactants and products, as an increase or decrease in disorder (entropy) often corresponds to a change in the number of gas molecules or phases.
Transcribed Image Text:**Predicting the Sign of Reaction Entropy** For each chemical reaction listed in the first column of the table below, predict the sign (positive or negative) of the reaction entropy \(\Delta S_{\text{rxn}}\). If it's not possible to decide with the information given, check the "not enough information" option in the last column. **Note for advanced students:** Assume the temperature remains constant. Assume all gases and solutions are ideal. | **Reaction** | **Sign of Reaction Entropy** | |----------------------------------------|----------------------------------------------------| | \( \text{Ag}^+ \, (aq) + \text{Cl}^- \, (aq) \rightarrow \text{AgCl} \, (s) \) | ○ \(\Delta S_{\text{rxn}} < 0\) <br> ○ \(\Delta S_{\text{rxn}} > 0\) <br> ○ not enough information. | | \( \text{C}_2\text{H}_2 \, (g) + 2\text{H}_2 \, (g) \rightarrow \text{C}_2\text{H}_6 \, (g) \) | ○ \(\Delta S_{\text{rxn}} < 0\) <br> ○ \(\Delta S_{\text{rxn}} > 0\) <br> ○ not enough information. | | \( \text{MgCl}_2 \, (s) + \text{H}_2\text{O} \, (l) \rightarrow \text{MgO} \, (s) + 2\text{HCl} \, (g) \) | ○ \(\Delta S_{\text{rxn}} < 0\) <br> ○ \(\Delta S_{\text{rxn}} > 0\) <br> ○ not enough information. | To decide the sign of the reaction entropy \(\Delta S_{\text{rxn}}\), consider the change in the number and states of the reactants and products, as an increase or decrease in disorder (entropy) often corresponds to a change in the number of gas molecules or phases.
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