7. Energy, Rate and Equilibrium

Predict how the entropy of the substance is affected in the following processes:

CH₄ (g, 125°C)   →   CH₄ (g, 200°C)

Which of the following processes shows a decrease in entropy of the system?

Does entropy increase or decrease in the following processes?

c. 2 SO₂(g) + O₂(g) → 2 SO₃(g)

Does entropy increase or decrease in the following processes?

a. Polymeric complex carbohydrates are metabolized by the body, converted into smaller simple sugars.

Which of the following processes results in an increase in entropy of the system?

a. A drop of ink spreading out when it is placed in water

b. Steam condensing into drops on windows

c. Constructing a building from loose bricks

For each of the following processes, specify whether entropy increases or decreases. Explain each of your answers.

a. Assembling a jigsaw puzzle

PRACTICE: Which reaction is most likely to have a positive ∆S of system?

a) SiO₂ (s) + 3 C (s) → SiC (s) + 2 CO (g)

b) 6 CO₂ (g) + 6 H₂O (g) → C₆H₁₂O₆ (s) + 6 O₂ (g)

c) CO (g) + Cl₂ (g) → COCl₂ (g)

d) 3 NO₂ (g) + H₂O (l) → 2 HNO₃ (l) + NO (g)