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its a chemical change because you cannot reverse the process and just have milk and vinegar separate
This is a chemical change.
This is a physical change due to the fact that you are adding two substances.
Yes, when you add an acid, like vinegar, to milk a chemical reaction occurs. The acid causes milk to curdle. In fact, by adding vinegar to milk you can make cheese! http://www.wikihow.com/Make-Cheese-at-Home
Milk curdling is a chemical change.
Milk turning sour is a chemical change.
physical
This is 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!
Physical change
because it is irreversible and it has a new substance
chemical change