Predict whether each of the following processes increases or decreases entropy. Select the single best answer for each part.

1. Condensation of water vapor on a cold surface: This process decreases entropy. When water vapor condenses into liquid water, the gas molecules, which are more disordered and spread out, transition to a more ordered liquid state.

2. Melting of a solid metal: This process increases entropy. When a solid metal melts, the structure of the solid becomes more disordered as the atoms or molecules move from a fixed position in a solid lattice to a more disordered state in the liquid phase.

In summary:

• Condensation of water vapor on a cold surface: decreases entropy
• Melting of a solid metal: increases entropy