boiling water
physical or chemical
Physical.
Boiling water is a physical change.
The process of boiling water is a physical change. It is not a chemical change because the substance of water itself does not undergo any chemical reactions or transformations when it boils.
When heat is applied to water, its temperature increases and the kinetic energy of its molecules also increases. As a result, the water molecules gain enough energy to overcome the attractive forces between them and break free from the liquid phase. This causes them to change from the liquid state to the gaseous state, forming water vapor.
To determine whether boiling water is a physical or chemical change, we can follow these steps:
1. Understand the concept: Chemical changes involve a transformation of the substances into new substances with different chemical properties. Physical changes, on the other hand, involve a change in the physical state or appearance of a substance without altering its chemical composition.
2. Analyze the process: When water boils, it changes from a liquid to a gas, but the molecules themselves do not change into a different substance.
3. Apply the criteria: Since no new substances are formed during boiling and the water molecules only change their state from liquid to gas, boiling water is considered a physical change rather than a chemical change.
So, the answer is that boiling water is a physical change.