Is rolling out a lump of pizza dough into crust is an example physical change?

Yes, rolling out a lump of pizza dough into crust is an example of a physical change. Here's why:

* No new substances are formed: The dough is still made up of the same ingredients (flour, water, yeast, etc.). The process of rolling simply changes the shape and size of the dough, not its chemical composition.

* The change is reversible: You could easily reshape the crust back into a lump of dough.

* The change is primarily based on the arrangement of molecules: Rolling changes how the molecules in the dough are arranged, but it doesn't break or form new chemical bonds.

In contrast, a chemical change would involve a change in the chemical composition of the dough. For example, baking the dough would be a chemical change, as the heat causes the starch molecules to break down and form new compounds, resulting in a crispy crust.