Question

1. a puddle left in the sunlight disappears after a couple hours
2. icicles forming on a tree at night
3. butter being left out from the fridge
4. water droplets getting cold in the clouds and forming snow
5. leaving soup in the freezer and it turns into a solid
6. antarctica is so cold salt water can even become a solid
7. gold is melted down at 1500°f and becomes a liquid
8. methane is a gas under normal conditions but becomes a liquid when exposed to cold environments

Explanation:

Since the problem is not specified (e.g., to identify the phase change process for each, classify the type of phase change, etc.), I'll assume the task is to identify the phase change (like evaporation, condensation, melting, freezing, deposition, etc.) for each scenario. Here's the analysis for each:

22. A puddle left in the sunlight disappears after a couple hours

The liquid water in the puddle turns into water vapor (gas) due to heat from the sun. This process is evaporation (a type of vaporization, where liquid → gas).

Water vapor in the air (gas) directly turns into ice (solid) on the tree. This is deposition (gas → solid), as it skips the liquid phase.

Butter is solid in the fridge. When left out, it absorbs heat and turns into a liquid (or softens). This is melting (solid → liquid).

Answer:

Evaporation (Liquid → Gas)

23. Icicles forming on a tree at night