Yes, milk souring is a chemical change.
Understanding the Chemical Change
When milk sours, bacteria present in the milk convert lactose (milk sugar) into lactic acid. This process is called fermentation. Lactic acid gives the sour taste and smell characteristic of spoiled milk.
Key Indicators of a Chemical Change
- Irreversible Change: The sour milk cannot be easily restored to its original state.
- New Substance Formation: Lactic acid, a new substance, is formed during the process.
- Change in Chemical Composition: The chemical composition of the milk changes, resulting in a different taste, smell, and texture.
Why is Milk Souring a Chemical Change?
Milk souring involves a change in the chemical makeup of the milk. The bacteria introduce enzymes that break down lactose into lactic acid. This transformation is a chemical reaction, resulting in a new substance with different properties.
Conclusion
Milk souring is a chemical change because it involves the formation of a new substance (lactic acid) through a chemical reaction. The sour taste and smell are a result of this chemical transformation.
