Correct, any phase change is considered to be a physical change.
No. State change is a physical reaction.
The process of dry ice sublimating, or turning directly from a solid to a gas, is a physical change. No new substances are formed, just a change in the physical state of the dry ice from solid to gas.
No, the process of cold water heating up to its boiling point is a physical change rather than a chemical change. This is because the molecules in water remain the same during the transition from liquid to gas; only their arrangement and energy levels change.
Neither. A physical change is changing something's tangible properties, such as shape or state of matter (solid, liquid, or gas), while a chemical change is turning something into something else entirely. For example, water freezing into ice is a physical change, but cake batter turning into cake is a chemical change. So, if it's the same thing that you start with as a liquid or gas and it simply becomes a solid, it's a physical change. If it becomes something else entirely, it's a chemical change. I hope that helped.
No. Unlike most other cooking methods, boiling pasta is basically just getting it wet. Any time you see a color change or a phase change (between gas, liquid, or solid), you've seen a chemical change (although not necessarily a reaction in the case of a phase change).
Yes, evaporation is a physical change of phase.
No. State change is a physical reaction.
Assuming you mean liquid water turning into gaseous water, that is a physical change, because it's still water (H2O.)
Heating ammonium chloride crystal is a physical change, as it only involves a change in state from a solid to a gas without forming any new substances.
Physical change, because the water is only changing state, from a gas to a liquid.
The process of dry ice sublimating, or turning directly from a solid to a gas, is a physical change. No new substances are formed, just a change in the physical state of the dry ice from solid to gas.
Heating water in a pan is a physical change, not a chemical change. The heat energy causes the water molecules to gain kinetic energy, leading to an increase in temperature and a phase change from liquid to gas (steam). The chemical composition of water remains the same.
A change in the physical state of matter is a physical change.
This is a chemical change (thermal decomposition).
Water can exist in three physical states: solid (ice), liquid (water), and gas (water vapor). It can undergo physical changes such as freezing (turning into ice), melting (turning into water), evaporation (turning into water vapor), condensation (turning back into liquid), and sublimation (directly turning from solid to gas).
Vaporization
The process of LPG turning from liquid to gas is a physical change, not a chemical change. It involves a change in state, from liquid to gas, without any alteration in the chemical composition of the LPG molecules.