What is an example of a physical change? having less ash than the paper that was burned to form it ice forming and then melting back into water rust having a different identity than the iron it forms on the irreversible reaction of vinegar and baking soda

The answer to your question is ''ice forming and then melting back into water''

Answer;

-Ice forming and then melting back into water

Explanation;

-A physical change is any change in matter that involves the substance going from one physical state to another. The reference to a physical state involves solids, liquids, and gases. When a substance undergoes a physical change it does not lose its original properties when changing from one phase to another.

-Examples of physical changes include;

Ice melting involves a change from a solid to a liquid and the substances maintain the properties of water because the molecules never change. Water boiling is a physical change as water molecules vibrate faster, they enter the gas phase and become water vapor.

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This movement is also referred to as  glacial plucking