Question

Which of the following is NOT a physical change? Dissolving salt in water Baking a cake Melting wax Freezing water

Answer 1

The answer explains that baking a cake is not a physical change because it involves chemical reactions between ingredients.

Step-by-step explanation:

Physical changes are naturally the alterations in the form or state of matter that do not involve a change in the substance's chemical composition. Examples include changes in size, shape, color, or state also said as solid to liquid to gas, without the creation of a new substance.

Physical changes can be classified as reversible or irreversible. Melting wax, freezing water, and dissolving salt in water are examples of physical changes. However, baking a cake is a chemical change, not a physical change, because it involves the chemical reactions between the ingredients that result in the formation of new substances.

Answer 2

The answer can be determined through the process of elimination. If you dissolve salt in water, you can get the salt back. When you freeze water you are simply changing its state of matter. Together with the melting of wax, the three processes mentioned experience only physical change. If you bake a cake, you can't get the ingredients back therefore the second option is the correct answer.