Which of these is an example of a chemical change a. mixing a salad dressing b. dicing an onion c. preparing a salad. d. digesting a salad

Answer : The correct option is, (D) Digesting a salad

Explanation :

Chemical change : It is a change where changes occurs in the chemical composition and thus resulting in the formation of new compound or substance.

Physical change : It is a change in which shape and size of a substance changes. In this there is no change in the chemical composition of the substance and no new substance is forming.

(A) Mixing a salad dressing  : It is an example of physical change because in this compositions are same that means no changes in chemical composition.

(B) Dicing an onion  : It is an example of physical change because there is no change in the chemical composition of the substance and no new substance is forming.

(C) Preparing a salad : It is an example of physical change because there is no change in the chemical composition of the substance and no new substance is forming.

(D) Digesting a salad : It is an example of chemical change because digestion is considered as chemical change in which an enzyme break down the larger molecule into smaller molecules so that our body can easily absorb food.

Hence, the example of chemical change is, (D) Digesting a salad

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."