is sodium hydroxide dissloves in water physical or chemical changes?

Answer 1

Physical. In order for it to be chemical there would have to be a catalyst and a complete molecular change.

Answer 2

it is a physical change, since no chemical reaction is taking place. the ions in sodium hydroxide simply "mix" (for lack of a better word) in the water.

there are big differences between physical and chemical changes, and a catalyst does NOT always need to be involved in either.

Answer 3

Physical!

Answer 4

physical, i suppose. the distinction is a bit arbitrary, since bonds are being broken and formed in the process. they are not covalent bonds though (ionic bonds in the crystal lattice are broken, hydrogen bonds solvating the ions are formed). presence or absence of a catalyst is irrelevant.