For a change to qualify as chemical a new substance has to be formed and energy is either absorbed or given off.
New Is Milk Turning Sour A Chemical Change
Images. So that we cannot get milk from the curd. A physical change is characterized with states of matter and energy.
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Water condenses on the outside of a glass of iced tea. Milk turning sour would be a chemical change because the chemical structure of the milk is changed by the bacteria digesting it. When critic acid and baking soda mix, carbon dioxide is produced and the temperature decreases.
So chemical changes require a change on a molecular level that cannot be reversed because they form some new substance.
This is an irreversible change. An example of this is milk turning sour. An example of a reaction which causes a color change is the rusting of iron. Green leaves turn colors in the fall.
