Question

Which of these changes involve forming or breaking chemical bonds?

burning and melting
boiling and melting
rusting and cutting
burning and digesting

Answer 1

B burning and digesting. Is your answer. During burning and digesting old bonds breaks and new bonds are formed and thus new products are made

Answer 2

It would be burning and digesting.

Melting is just causing a status change, solid to liquid.

Cutting is just changing the shape of something.

Rusting doesn't change the actual substance.

Boiling changes the state as well.

It's only burning and digesting.