Question

Hello please answer my question a chemical change is always indicated by bubbling of a gas. Please it is urgent​

Answer 1

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When substances are put in the same container like, CaCO3 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.......☺

Answer 2

Answer:

When substances are put in the same container like, CaCO3 and HCl .

Explanation:

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