Question

When a substance dissolves, it undergoes a _____.

Answer 1

2 types of changes
physical change
chemical change

the easy way to tell the difference is
a physical change is genrally reversable
it changes the look but not the composition
for example, water freezes into ice is physical change

a chemical change is generally not reversable (easily)
ex metal rusting, egg rotting
it changes theh composition itself


when a substance disolves, it actually merges and the molecules move around and sometimes bond
so it's a chemical change

Answer 2

The right answer is physical change.

In the general sense, dissolution is the action of dissolving something, that is to say, of decomposing it by the separation of its parts.

In chemistry, dissolution is an intimate mixture of two bodies, at least one of which is liquid.

Eg: the dissolution of sugar in the water, the sugar will pass from the solid and dry state to the dissolved state so there is a physical change. The sugar is going to be surrounded by water molecules and form hydrogen bonds, so it can be a chemical change.