The two changes of state involved in freeze drying are melting and freezing.
These are sublimation and freezing.
physical change because part changes to a liquid or solid, while another part changes to a gas - however the substance is only changing state, so it would be a physical change
The temperature remain constant during a change of phase.
When water changes to water vapor, it has changed its state from liquid to vapor and no chemical change has taken place. It's only a physical change.
They aren't; a change of state is a physical change
There are actually three changes of state that release energy. Liquid to solid, gas to liquid, gas to solid.
The changes of state that happen during distillation are: Liquid to a gas and gas to a liquid
The thing that changes during a change of state is the intermolecular forces are disrupted. The temperature will not change because all of the energy is going into disrupting or organizing the intermolecular forces.
physical change because part changes to a liquid or solid, while another part changes to a gas - however the substance is only changing state, so it would be a physical change
The three changes of state during which energy is absorbed is: conduction, convection, & radiation.
Kinetic Energy is gained in the foward changes and lost in the reverse changes of state
During boiling of water,water changes its state from liquid to gas due to a change in temperature. Therefore it is a physical change.
No i can't
During phase changes the temperature of a substance does not change.
The state changes
a change of state
Thermodynamics
If you mean the "state" of matter, during evaporation, it changes from a liquid to a gas.