how to know that a reaction will take place or not by looking at the reactants
Answers
Explanation:
We can tell if a chemical reaction has taken place when one or more of the following things happen:
There has been a colour change inside the reaction flask.
A gas has formed. Usually we know a gas has formed when we can see bubbles. ...
A solid has formed.
No, You can't surely tell will reaction occur or not because there isn't any full proof theory on it. chemistry is subject of exceptions.
You can determine whether a reaction is spontaneous by calculating the standard Gibbs free energy of reaction, the difference in Gibbs free energy between pure products and pure reactants in their standard states. (Remember that the Gibbs free energy is the maximum amount of non-expansion work you can get out of a system.) If the free energy of reaction is negative, the reaction is thermodynamically spontaneous as written. If the free energy of reaction is positive, the reaction is not spontaneous.