Final answer:
Water turning into snow is a physical change, hair being cut is a physical change, and bread dough becoming fresh bread in an oven involves chemical changes.
Step-by-step explanation:
a. Because the water is going from a gas phase to a solid phase, this is a physical change.
b. Your long hair is being shortened. This is a physical change.
c. Because of the oven's temperature, chemical changes are occurring in the bread dough to make fresh bread. These are chemical changes. (In fact, a lot of cooking involves chemical changes.)
Baking a cake is a chemical change due to the heat-induced chemical reactions during baking, while physical changes, like cutting a cake, do not alter its chemical change.
Baking a cake is an example of a chemical change. When you mix ingredients and bake them, the substances undergo chemical reactions to form new compounds, which is the essence of a chemical change. These reactions can include the formation of new flavors and colors, the creation of gas pockets that make the cake rise, and more. These changes are usually permanent and cannot be reversed by simple physical means, such as cooling or freezing.
For comparison, smashing a cake does not change its chemical composition, therefore it would be classified as a physical change. Physical changes involve changes in the physical state or appearance of a substance without altering its chemical identity. For instance, melting butter for the cake mix or freezing a slice of baked cake are physical changes.
In summary, the cooking of dough to make bread and the baking of a cake are prime examples of chemical changes because both involve heat-induced chemical reactions that transform the ingredients into a new product. Conversely, cutting or freezing a cake represent physical changes because they do not alter the chemical composition of the cake.