Why can't chemical changes be reversible?

Answer 1

Because its components have changed into something entirely different, so you can't pick out what has gone in. For example, if you mix water and salt, you can not take the salt out of the water because it has reacted with it to be changed into somthing different.

Answer 2

Chemical changes involve the breaking and forming of chemical bonds, resulting in the creation of new substances with different chemical properties. These changes are usually irreversible because the original reactants have transformed into new products, making it difficult to revert back to the initial chemicals through a simple physical process. Additionally, chemical reactions often involve energy changes, such as the release or absorption of heat, making it challenging to reverse the reaction under the same conditions.

Answer 3

This is a common misconception. Chemical changes can be reversed. It happens all the time, and there's a large branch of physical chemistry devoted to it. The problem stems from some teachers trying to oversimplify when teaching the difference between physical and chemical changes. A chemical change is one which produces a new substance, and a physical change is one which does not. Common examples of physical changes are melting and boiling water, and common examples of chemical changes are rusting and burning. Unfortunately, people extrapolate from these limited examples and their own limited knowledge, to say that since melting and boiling water is easy to reverse, and they don't know how to reverse rusting and burning, that 'chemical changes can't be reversed and physical ones can'. It just isn't true.

When we convert iron to steel, rusty scrap iron is often included in the mixture, and one of the reactions taking place in the converter vessel is the reduction of rust to iron. Burning isn't simple to reverse, not least because the products are usually carbon dioxide and water vapour which escape into the air. However, when plants photosynthesise they take carbon dioxide and water and convert them to glucose and oxygen, and eventually most fuels derive from that glucose. Additionally, not all physical changes are easy to reverse. If you freeze water you can easily turn it liquid again, true, but if you freeze liquid iron you have to heat it to 1538 degrees C to remelt it - hardly easy!

Answer 4

because they change the identity of the matter

Answer 5

a chemical change can't be normally reversed because in a chemical reaction, a new substance is formed with the help of the processes like heating, baking, electifying etc.

Answer 6

because,a chemical cant be seen be seen and the physical change can be reversed because is easier to be sen

Answer 7

chemical changes the substance where as physical breaks it down

Answer 8

The structure of molecules was changed.

Answer 9

Many chemical reactions are reversible.

Answer 10

The possibility for reversible chemical reactions exist.