Question

Which process is a chemical change?

1. freezing of liquid water to solid ice
2. condensation of gaseous steam to liquid water
3. boiling of liquid water to gaseous steam
4. decomposing of water to hydrogen gas and oxygen gas

Answer 1

4

Step-by-step explanation:

1, 2, and 3 are changes in the state of matter. 4 is a chemical reaction because the resulting products are different substances from the first one.