# What must occur for a change to be a chemical reaction?

Apr 15, 2017

$\text{(i) The formation of new substances........}$
$\text{(ii) And the making and breaking of strong chemical bonds............}$
And if both conditions are satisfied, then you have the specified $\text{chemical change.}$ There are many other answers here that classify common transformations, I urge you to seek them out........