A phase change is an example of a .Physical Property
.Chemical Property
.Physical Change
.Chemical Change

Physical property

Explanation:

There are two types of properties that can occur in a reaction viz: physical nd chemical. Physical property are those ones have do not change the chemical identity of the substance involved as opposed to chemical properties in which the chemical composition of the substances are changed.

Physical properties include signs such as change of phase i.e. solid to gas, melting and boiling points, colour etc.

since electrons are negative the answer is neagtaive

level 4 to level 2 : ))