Final answer:
The commonality between boiling water on a stove and mixing sand and gravel is that they both involve physical transformations without any chemical reactions occurring.
Step-by-step explanation:
Water boiling on a stove and mixing sand and gravel are two different changes that have something in common. Both of these changes involve physical transformations rather than chemical reactions.
When water boils, it changes from a liquid to a gas without any new substances being formed. The same goes for mixing sand and gravel - they are simply being blended together, but no new substances are created.
So, in summary, the commonality between these two changes is that they both involve physical transformations without any chemical reactions occurring.
. In both cases, no chemical bonds are broken or formed. When water boils, it undergoes a phase change from liquid to gas without a change in chemical composition, represented by the equation H2O (l) → H2O (g). Similarly, when sand and gravel are mixed, the individual components retain their original properties; such a process is akin to entropy increase without energy available to do work as in a heat engine.