Is bubbling the sign of a chemical or physical change?
Bubbling can be the indication for both chemical or physical change.
- When substances are put in the same container like,
#CaCO_3#and #HCl#. A reaction occurs and bubbles escape the container (effervescence). These bubbles are actually gas fumes, and this shows that a new gaseous product is formed.
Here, bubbling indicates our chemical reaction.
- On the other hand, when the water is boiled, bubbles are also produced and water vapors escape from the container. Here you can see it is an example of physical change.