Question

Which definition is correct?

a physical change creates a new substance because bonds are broken or formed
a physical change can happen without changing any characteristics of the substance
a chemical change occurs when the substance remains the same but the shape, or other physical characteristics change
a chemical change produces a new substance by breaking and forming new bonds

Answer 1

last one is correct

Step-by-step explanation:

bcoz when a reaction takes place there is the formation of new products with the help of old one .