Thermodynamics Individual Quiz

Obavezno

1

HCl dissolves readily in water to form an acidic solution.
HCl (g) → H⁺(aq) + Cl^–(aq)
What will be the change in entropy?

Negative

Positive

No change

Obavezno

1

Above 840°C, calcium carbonate will decompose to produce calcium oxide and carbon dioxide gas. CaCO₃(s) → CaO(s) + CO₂(g)
What is the entropy change of the reaction?

Negative

Positive

No change

Obavezno

1

Sodium hydroxide reacts with copper sulfate to give a pale blue precipitate.
2NaOH(aq) + CuSO₄(aq) → Cu(OH)₂(s) + Na₂SO₄ (aq)
What is the entropy change of the reaction?

Negative

Positive

No change

Obavezno

1

Describe and explain the change in entropy when water is heated from 293K to 343K?

Obavezno

1

Which of the following can explain why an endothermic reaction can be spontaneous?

The reaction happens at very high temperatures.

The system becomes less disorder.

The Gibbs free energy of the reaction is positive.

Obavezno

1

Methanol undergoes combustion and produces carbon dioxide and water.
Using the standard molar entropy values, calculate the standard entropy change of combustion of methanol.
[Standard entropy values/ J K⁻¹ mol⁻¹: CH₃OH(l): 126.8, O₂(g): 205.0, CO₂(g): 213.6, H₂O(l): 69.9]

+ 80.9 J K⁻¹ mol⁻¹

- 80.9 J K⁻¹ mol⁻¹

+21.6 J K⁻¹ mol⁻¹

-21.6 J K⁻¹ mol⁻¹

Obavezno

1

2NaHCO_³(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
[standard enthalpy change of reaction, ∆H = −135.6 kJ mol⁻¹ ; standard entropy change of reaction ∆S = −334 J K⁻¹ mol⁻¹]
What is the maximum temperature for which this reaction is spontaneous?

0.406 K

0.405 K

405 K

406 K

Thermodynamics Individual Quiz

HCl dissolves readily in water to form an acidic solution. HCl (g) → H+(aq) + Cl–(aq) What will be the change in entropy?

Above 840°C, calcium carbonate will decompose to produce calcium oxide and carbon dioxide gas. CaCO3(s) → CaO(s) + CO2(g) What is the entropy change of the reaction?

Sodium hydroxide reacts with copper sulfate to give a pale blue precipitate. 2NaOH(aq) + CuSO4(aq) → Cu(OH)2(s) + Na2SO4 (aq) What is the entropy change of the reaction?

Describe and explain the change in entropy when water is heated from 293K to 343K?

Which of the following can explain why an endothermic reaction can be spontaneous?

Methanol undergoes combustion and produces carbon dioxide and water. Using the standard molar entropy values, calculate the standard entropy change of combustion of methanol.[Standard entropy values/ J K−1 mol−1: CH3OH(l): 126.8, O2(g): 205.0, CO2(g): 213.6, H2O(l): 69.9]

2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) [standard enthalpy change of reaction, ∆H = −135.6 kJ mol−1 ; standard entropy change of reaction ∆S = −334 J K−1 mol−1] What is the maximum temperature for which this reaction is spontaneous?

HCl dissolves readily in water to form an acidic solution. HCl (g) → H+(aq) + Cl–(aq) What will be the change in entropy?

Above 840°C, calcium carbonate will decompose to produce calcium oxide and carbon dioxide gas. CaCO3(s) → CaO(s) + CO2(g) What is the entropy change of the reaction?

Sodium hydroxide reacts with copper sulfate to give a pale blue precipitate. 2NaOH(aq) + CuSO4(aq) → Cu(OH)2(s) + Na2SO4 (aq) What is the entropy change of the reaction?

Describe and explain the change in entropy when water is heated from 293K to 343K?

Which of the following can explain why an endothermic reaction can be spontaneous?

Methanol undergoes combustion and produces carbon dioxide and water. Using the standard molar entropy values, calculate the standard entropy change of combustion of methanol.[Standard entropy values/ J K−1 mol−1: CH3OH(l): 126.8, O2(g): 205.0, CO2(g): 213.6, H2O(l): 69.9]

2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g) [standard enthalpy change of reaction, ∆H = −135.6 kJ mol−1 ; standard entropy change of reaction ∆S = −334 J K−1 mol−1] What is the maximum temperature for which this reaction is spontaneous?

HCl dissolves readily in water to form an acidic solution.
HCl (g) → H⁺(aq) + Cl^–(aq)
What will be the change in entropy?

Above 840°C, calcium carbonate will decompose to produce calcium oxide and carbon dioxide gas. CaCO₃(s) → CaO(s) + CO₂(g)
What is the entropy change of the reaction?

Sodium hydroxide reacts with copper sulfate to give a pale blue precipitate.
2NaOH(aq) + CuSO₄(aq) → Cu(OH)₂(s) + Na₂SO₄ (aq)
What is the entropy change of the reaction?

Methanol undergoes combustion and produces carbon dioxide and water.
Using the standard molar entropy values, calculate the standard entropy change of combustion of methanol.
[Standard entropy values/ J K⁻¹ mol⁻¹: CH₃OH(l): 126.8, O₂(g): 205.0, CO₂(g): 213.6, H₂O(l): 69.9]

2NaHCO_³(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
[standard enthalpy change of reaction, ∆H = −135.6 kJ mol⁻¹ ; standard entropy change of reaction ∆S = −334 J K⁻¹ mol⁻¹]
What is the maximum temperature for which this reaction is spontaneous?

HCl dissolves readily in water to form an acidic solution.
HCl (g) → H⁺(aq) + Cl^–(aq)
What will be the change in entropy?

Above 840°C, calcium carbonate will decompose to produce calcium oxide and carbon dioxide gas. CaCO₃(s) → CaO(s) + CO₂(g)
What is the entropy change of the reaction?

Sodium hydroxide reacts with copper sulfate to give a pale blue precipitate.
2NaOH(aq) + CuSO₄(aq) → Cu(OH)₂(s) + Na₂SO₄ (aq)
What is the entropy change of the reaction?

Methanol undergoes combustion and produces carbon dioxide and water.
Using the standard molar entropy values, calculate the standard entropy change of combustion of methanol.
[Standard entropy values/ J K⁻¹ mol⁻¹: CH₃OH(l): 126.8, O₂(g): 205.0, CO₂(g): 213.6, H₂O(l): 69.9]

2NaHCO_³(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
[standard enthalpy change of reaction, ∆H = −135.6 kJ mol⁻¹ ; standard entropy change of reaction ∆S = −334 J K⁻¹ mol⁻¹]
What is the maximum temperature for which this reaction is spontaneous?