Milk Souring a Physical Change?

Answer

When milk goes sour, that is a chemical change. Milk souring is not considered to be a physical change. In a chemical change, the substance that is present when the change begins is no longer present when the change ends. 
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Q&A Related to "Milk Souring a Physical Change?"
It is a chemical change because there is a chemical reaction occurring that is rotting the milk. An example of a physical change would be if the milk was evaporated or frozen.
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Milk souring's chemical change that takes place as opposed to when it was just
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It is a chemical change. Chemical changes are permanent and the product you end up with after the change cannot be reverted back to the original material. Burning is an example of
http://answers.yahoo.com/question/index?qid=201107...
Chemical change as the atoms molecules and particles are chemically changed into new substances
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