Question

which change is chemical? (1 point)
water evaporating: liquid water becoming gaseous water
water freezing: liquid water becoming solid water
water boiling: solid water becoming gaseous water
water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules

Explanation:

A chemical change results in the formation of new substances with different chemical properties. Evaporation, freezing, and boiling of water are physical changes as they only involve changes in the state of water (liquid - gas, liquid - solid) without altering the chemical composition of water ($H_2O$). However, water electrolysis breaks water molecules into oxygen and hydrogen molecules, creating new substances.

Answer:

water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules