When a substance changes from one phase to another, which of the following events occurs?

Heat is transferred when a substance changes phases. Substances can be made to change phases by fluctuating the temperature, the pressure, or both. I hope I could help!

Answer

Correct Answer is

Heat is added or lost

Explanation

we know that there are four well know phases these are as follows

1. solid

2.liquid

3.gas

4. plasma

when a material changes from one phase to another phase this phenomena is known as phase change

for example conversion of water from liquid form to vapor form is a phase change.

In all phase changes like change of solid phase to liquid phase, change of liquid phase to vapor phase or vapor to liquid phase heat  is always involved to change the bonding between the molecules of substance. When liquid changes to solid form that time Heat leaves the liquid as it freezes.During these phase changes average kinetic energy does not change nor temperature changes