Its motion changes speed on the molecular level
During phase changes the temperature of a substance does not change.
The melting phase changes are Solid~Liquid~Gas and the freezing phase changes are Gas~Liquid~Solid
Phase change. Liquid phase to gaseous phase (evaporation) Liquid phase to solid phase (solidification, freezing) Solid phase to gaseous phase (sublimation9 Etc...
This is called a change in phase or a phase transition. It occurs when a substance transitions from one of the states of matter (solid, liquid, gas) to another due to changes in temperature or pressure.
Phase changes are physical changes in nature. They involve a change in the state of matter (solid, liquid, gas) rather than a change in the chemical composition of the substance. Heating or cooling a substance can trigger phase changes.
Shape and volume
The conservation of matter principle states that matter cannot be created or destroyed in a chemical reaction. In the context of phase changes, the total mass of a substance remains the same before and after a phase change occurs. This means that during a phase change, while the substance may change its physical state (solid to liquid, liquid to gas, etc.), the total amount of matter stays constant.
A solid is a state of matter that does not change in volume because the particles are closely packed together and have fixed positions.
Phase changes are physical changes, not chemical changes. They involve a change in the state of matter (solid, liquid, gas) without altering the chemical composition of the substance.
Because the substance is physically changing.
It is a physical change. All phase changes are physical, not chemical. The chemical composition of water does not change when it changes from a liquid to a gas, or for that matter, to a solid.
No, phase changes in matter are not permanent. They can be reversed by providing or removing energy (such as heat) to the substance. For example, ice can melt into water when heat is applied, and the water can freeze back into ice when it is cooled.