Yes, freeze it again.
yes, you just chuck it in the freezer
Yes, it is usually but sometimes isn't
An example of a physical change that can be reversed is melting ice into water; this can be reversed by freezing the water back into ice. An example of a physical change that cannot be reversed is breaking a glass; once the glass is shattered, it cannot be returned to its original form.
Change of state from a liquid to a solid and back again.
Yes, physical changes can usually be reversed because the substance's molecular structure remains the same. For example, melting ice into water and then refreezing it back into ice is a reversible physical change.
It is a physical change because when you have a chemical change it changes the properties and makes it into a new thing, and it can't be reversed. Physical changes are usually just changes of states (solid, liquid, gas) and a physical change can be reversed.
solidify is an irreversible
No, once ice has melted, it cannot be reversed back into its solid state without the application of freezing temperatures or other methods of solidification.
Melting ice cubes is a physical change because the substance (water) remains the same chemically before and after the change. The process of melting involves a physical change in state from solid to liquid without altering the chemical composition of the substance.
Melting a paper clip is a physical change because it does not alter the chemical composition of the paper clip. The paper clip simply changes from a solid state to a liquid state and can be reversed by cooling it back to a solid.
No, a lava lamp is not a reversible change. The melting and mixing of the wax and oil inside the lamp is a physical change that cannot be easily reversed to its original state.