Which is an example of substances reacting chemically?
A B C D
iron and oxygen forming rust paper being cut into small pieces chocolate melting in a pan flour and sugar mixed together in a bowl
Question: Which is an example of substances reacting chemically?
(A) iron and oxygen forming rust
(B) paper being cut into small pieces
(C) chocolate melting in a pan
(D) flour and sugar mixed together in a bowl

Answer: (A) iron and oxygen forming rust
Answer: (B) paper being cut into small pieces
Question: Which is an example of substances reacting chemically?
(A) iron and oxygen forming rust
(B) paper being cut into small pieces
(C) chocolate melting in a pan
(D) flour and sugar mixed together in a bowl
Answer: (A) iron and oxygen forming rust