Is making a rock candy by evaporating water from sugar solution physical or chemical change?

Making rock candy by evaporating water from a sugar solution is a physical change. Here's why:

* No new substances are formed: The sugar and water remain the same molecules throughout the process. The sugar simply becomes more concentrated as the water evaporates.

* The change is reversible: If you dissolve the rock candy back into water, you essentially reverse the process and get back your original sugar solution.

In contrast, a chemical change would involve:

* The formation of new substances with different chemical properties.

* Changes that are typically difficult or impossible to reverse.

Let me know if you have any other questions!