- Cooking food requires adding heat energy to the food
- Adding heat to food usually causes chemical reaction
- Hence, cooking causes a chemical reaction

- Cooking causes a chemical reaction
- Baking is a kind of cooking
- So, baking causes a chemical reaction

- Baking causes a chemical reaction
- The dough is baked to form the crust of a pizza
- So, baking the dough to form the crust causes a chemical reaction

- Baking the dough to form the crust causes a chemical reaction
- Chemical reactions cause chemical change
- Hence, baking the dough to form the crust causes a chemical change

Therefore, baking the dough to form the crust causes a chemical change
In making a pizza, which process involves a chemical change?
- Baking is a kind of cooking 
- Cooking food requires adding heat energy to the food 
- The dough is baked to form the crust of a pizza 
- Chemical reactions cause chemical change 
- Adding heat to food usually causes chemical reaction