Question

explain how can you identify that a chemical reaction has occurred justify with an example​

Answer 1

Answer:

Generally when a chemical change occurs, the following things can take place-

1. There is a change in colour. Eg.- shiny blue bike outside over the rainy winter for too long. You saw rust, of course. Rust forms on your bike when the iron in the metal frame reacts with the oxygen and water in the air. It forms a new compound called iron oxide. This change in color, from blue to reddish brown, indicates that a chemical change has taken place.

2. There is change in temperature. Eg. Firework

3. precipitate formation- when 2 salts are mixed