Question

what do these two changes have in common? water evaporating from a puddle water vapor condensing on a bathroom mirror select all that apply. both are only physical changes. both are chemical changes. both are caused by heating. both are caused by cooling.

Explanation:

1. Analyze "water evaporating from a puddle": Evaporation is a physical change (liquid to gas, no new substance) and is caused by heating (heat provides energy for water to change state).
2. Analyze "water vapor condensing on a bathroom mirror": Condensation is a physical change (gas to liquid, no new substance) and is caused by cooling (cool mirror causes vapor to lose energy and condense).
3. Evaluate options:

• "Both are only physical changes": Correct, as both are phase changes (physical, no chemical bonds broken/formed).
• "Both are chemical changes": Incorrect, no chemical reaction occurs.
• "Both are caused by heating": Incorrect, condensation is cooling - induced.
• "Both are caused by cooling": Incorrect, evaporation is heating - induced.

Answer:

A. Both are only physical changes.