Question

How can you say whether or not a chemical change takes place when
(1) milk turns sour.
(i) iron changes into iron rust?​

Answer 1

Answer:

Explanation:

1. Milk turns sour

    Answer: when we add any citrus object in the milk, it turns sour.This is a  

    chemical change.We can say this as in this process, a new substance is

    formed by the mixing of two substances.

     

     2.iron changes to rust

     Answer:Iron combines with the moisture present in the atmosphere to

     form rust{Fe}.This is also a chemical change.This is so because a new

     substance rust is formed when moisture and iron reacts to form Rust{Fe}.