Define Reversible reactions

Reversible reactions:

Have you ever seen a toothbrush that changes colour as you use it?



Changes which can go backwards or

forwards are called reversible.

When you heat blue (hydrated) copper sulfate, it loses

the water which is bonded in its crystals.

This reaction is called dehydration. It is endothermic.

You get a white powder called anhydrous copper sulfate.

If you add water, the blue (hydrated) copper sulfate

is formed again. This is called hydration. It is exothermic.


Reversible reactions are shown by arrows pointing in both directions :

hydrated copper sulfate ↔ anhydrous copper sulfate + water

(blue crystals)                                  (white powder)

CuS04 .5 H20 ↔ CuS04 + 5 H 2O

The energy absorbed in the forward reaction is the same as the energy given out in the reverse

reaction.

Q: What is reversible reactions?

Ans: Changes which can go backwards or forwards are called reversible.

Q: What happened to the energy in the forward and in the reverse reaction?

Ans: The energy absorbed in the forward reaction is the same as the energy given out in the reverse

reaction.

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