Entropy and Gibbs Energy

Entropy and Gibbs Free Energy

Multiple Choice

What is the sign of the enthalpy and entropy change in the following reaction

Mg(s) + 2HCl(aq) --> MgCl_2(aq) + H_2(g)

• Enthalpy +ve, Entropy -ve

• Enthalpy -ve, Entropy -ve

• Enthalpy +ve, Entropy +ve

• Enthalpy -ve, Entropy +ve

Multiple Choice

Which reaction has the greatest increase in entropy of the system?

A. HCl (g) + NH₃ (g) → NH₄Cl (s)

B. (NH₄)₂Cr₂O₇ (s) → Cr₂O₃ (s) + N₂ (g) + 4H₂O (g)

C. CaCO₃ (s) → CaO (s) + CO₂ (g)

D. I₂ (g) → I₂ (s)

• A

• B

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• D

Multiple Choice

Which is correct for the reaction H2O (g) → H2O (l) ?

A. Enthalpy increases and entropy increases.

B. Enthalpy decreases and entropy increases.

C. Enthalpy increases and entropy decreases.

D. Enthalpy decreases and entropy decreases.

• A

• B

• C

• D

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