Question

how can you tell that baking a cake produces a chemical change?
it produces changes of state in the ingredients.
it changes physical properties such as color and odor.
it combines the ingredients to form new substances.
it causes changes that are reversible.

Explanation:

A chemical change is defined by the formation of new substances with distinct chemical properties. Changes of state, altered physical properties alone, or reversible changes describe physical changes, not chemical ones. Baking a cake transforms ingredients like flour, eggs, and baking powder into a new substance (the cake) that cannot be converted back to its original components, which fits the definition of a chemical change.

Answer:

It combines the ingredients to form new substances.