Heating Salt, physical/chemical?

Question

Salt is placed in water in an oven, and when it comes out, the salt is in huge chunks. Is this a physical or a chemical change?

Answer 1

Gervald's answer is:
Dissolving, evaporation and crystallisation are all physical changes because the substance is NaCl all along.


But after modifying his answer, it becomes: Dissolving, evaporation and crystallisation are all physical changes because there is no formation of new products (or rather no chemical reaction involved) all along.

Answer 2

genuine, rusting of iron is a CHEMICAL exchange. Rust is scientifically called oxidation, which occurs whilst oxygen is attainable in long-term touch with particular metals. over the years, the oxygen combines with the metallic at an atomic point, forming a sparkling compound called an oxide. thus, a sparkling substance is shaped. additionally genuine, dissolving salt in water is a actual exchange. in basic terms because of the fact salt dissolves in water does not propose that a chemical exchange has taken place. A chemical exchange is the place bonds are broken and NEW BONDS style inflicting a rearrangement of atoms into new molecules. Dissolving is a actual technique the place the substance keeps its own actual characteristics yet in basic terms changes state or shape etc. whilst salt is put in water, the sodium and chloride atoms are pulled aside with the aid of the water. They disappear. yet whilst the water is taken away, the sodium and chloride atoms rejoin with one yet another.

Answer 3

Dissolving, evaporation and crystallisation are all physical changes because the substance is NaCl all along.