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A physical change is when a substance undergoes a process whereby its physical features change but its chemical features stay the same.

A chemical change is when an object undergoes a process whereby its chemical composition changes.

The water leaving as steam has undergone a physical change (evaporation) from a liquid state to a gaseous one, but no chemical change has occurred because it is still H2O. By definition, any change in the state of matter is a physical change.

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9y ago
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13y ago

Because the actual checmical makeup of the water doesn't change. It is still H2O, it's just that the molecules are sped up and spread apart. In order to be a chemical change, the molecule itself would need to become a different one.

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13y ago

A physical change is a change that its form or appearance of matter changes but not its composition. Boiling water is a physical change because you only change the temperature but the matter is still water.

By- Ashaparekh44

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13y ago

New substances are not being formed. The water is simply changing from one state (liquid) to another (gas)

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6y ago

Boiling water is a physical change because you aren't changing the chemical components of water, just forcing the molecules away from each other.

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8y ago

During boiling the chemical formula of water is not changed.

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Anonymous

Lvl 1
3y ago

I don’t know

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Q: How does boiling water a physical change?
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