Is milk smelling sour a physical or chemical property? i know that milk souring is a chemical change, but the question does mention the senses. .

It's not chemical because it would have to react to something to change so it is physical change because it is the same thing but it just smells I hope this helped

No I actually took this last year. When milk turns sour it's a chemical change.
You can't undo a chemical change as for a physical change it's reversible. Trust me on this one.

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What do you need with it’s not a question your just stating what it says