Changes Around Us: Physical and Chemical — Science STD 7 — Question
Gujarat BoardEnglish MediumSTD 7ScienceChanges Around Us: Physical and Chemical2 Marks
Question
How does the process of making curd from milk illustrate a chemical change?
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Answer
The making of curd from milk exemplifies a chemical change because it involves the transformation of milk into a new substance with different properties. During curdling, bacteria convert lactose (milk sugar) into lactic acid, resulting in a change in taste, texture, and acidity. This conversion indicates a chemical reaction, making curd formation a chemical change.
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