Is boiling water a physical change?

Answer 1

The water leaving as steam has undergone a physical change from a liquid state to a gaseous one. No chemical change has occured because it is still H2O.
Basic explanation:

H2O(liquid) + heath <===> H2O(gaseous)+ ...

Water passes from a liquid form to gaseous, through an active physical process called : "evaporation", that occures with the help of a source of enery (heater).

=> When the H2O molecule is heaten up, physical reactions occurs:

- excitement (disorder increase, "molecules are increasingly kegeling" )

- breaking of the hydrogen bridges/connections between the: "O" (oxygens) and "H" (hydrogens), liberating them from their actractive forces through the process of gasification.

... In the end:

=> Final global composition : When water boiles molecules "stay unchanged", they are the same H2O in vapour as before in liquid state.

----------------------------------------------------------------------------------------------------

This is (by definition) physical (like any change in state of matter is physical).

Answer 2

The water leaving as steam has undergone a physical change from a liquid state to a gaseous one. No chemical change has occurred because it is still H2O.

Basic explanation:

H2O(liquid) + heat <===> H2O(gaseous)

Water passes from a liquid form to a gaseous form through evaporation. By definition, any change in the state of matter is a physical change.

Evaporation Process

When the H2O molecule is heated (excited), physical reactions occur:

- excitement (disorder increase, molecules are increasingly kegeling)

- breaking of the hydrogen bridges/connections between the "O" (oxygens) and "H" (hydrogens), liberating them from their attractive forces through the process of gasification.

Answer 3

yes it is a physical change, because when its becomes gas after a while.

Answer 4

yes