It's not a physical change
Milk turning sour is a chemical change.
Physical
no it is chemical
chemical change
because it is irreversible and it has a new substance
Milk is normally a liquid(a suspension of cream droplets in water), by freezing it milk changes from a liquid to a solid. This is a physical change, the substance is still milk, however it is no longer a liquid, it has changed into a solid.
Souring milk causes a chemical change because it changes its state of matter (from a liquid to a semi-solid), and it grows bacteria. When milk sours it causes a permanent change, therefore making it a chemical change.
well i think they are a chemical change as you can not reverse it- a physical change is basically a change that can not be reversed :) hope this helps!
when milk curs it is a chemical change. A physical change is change in form, which is revesrable. Like water being frozen then thawed. A chemical change is irreversible, and involves a change in the chemical make up. What is happening is a new compound is being formed by the milk reacting with the air and such.
why is milk turning sour during summers
Yes, milk turning sour is a chemical change.
This is a chemical change.