Question

3. curdling of milk is a. ______ change.​

Answer 1

curling of milk is a chemical change

Answer 2

In chemistry, we usually distinguish between two sorts of alterations based on the type of change that is taking place.

Explanation:

• We are given a process called "curdling of milk" in the question, and we must determine whether this change is chemical or physical.
• We all know that curdling refers to the process of turning milk into curd. Let's have a look at how this conversion takes place.
• To make curd, we boil milk and add a spoonful of curd to act as an inoculum. Curd contains lactic acid, as we all know. Casein protein is found in milk, and it reacts with lactic acid. Lactic acid breaks down the milk's chemical structures/bonds and produces new ones, resulting in curd, a semi-solid form of milk.
• Throughout the procedure, we saw that the reaction between lactic acid and milk involves the breakdown and formation of new bonds.
• As a result, it is related with a chemical change, and so this change is a chemical change.
• As a result, curdling milk is a chemical transformation.