Dissolving a spoonful of sugar in tea or coffee is an example an?

Here's why:

* No new substance is formed: The sugar molecules are simply dispersing throughout the tea or coffee, but they don't change their chemical structure. You can still recover the sugar by evaporating the water.

* The change is reversible: You can easily reverse the process by allowing the water to evaporate, leaving the sugar behind.

* The change is primarily physical: The sugar molecules are simply changing their state of matter (from solid to dissolved), not their chemical composition.

In contrast, a chemical change would involve the formation of a new substance with different properties.