Which of the following is a chemical change that occurs to the food?
A The reduction in size of food particles as food is chewed
B The movement of food to the stomach after food is swallowed
C The breakdown of molecules of food by enzymes and acid in the stomach
D None of the above***
Ok, it is C. Thank you!
The correct answer is C. The breakdown of molecules of food by enzymes and acid in the stomach.
To determine which of the options is a chemical change that occurs to food, we need to understand what a chemical change is and evaluate each option accordingly.
A chemical change refers to a process in which the composition of a substance is altered, resulting in the formation of new substances with different properties. On the other hand, a physical change involves a change in the state or appearance of a substance without altering its chemical composition.
Let's evaluate each option:
A) The reduction in size of food particles as food is chewed is a physical change. Chewing breaks down the food into smaller pieces without changing its chemical composition.
B) The movement of food to the stomach after it is swallowed is also a physical change. It involves the movement of food through the esophagus to the stomach, but it does not change the chemical composition of the food.
C) The breakdown of molecules of food by enzymes and acid in the stomach is a chemical change. When food enters the stomach, it is subjected to acidic conditions and the action of enzymes that break down complex molecules into simpler substances. This process alters the chemical composition of the food.
Therefore, the correct answer is option C: The breakdown of molecules of food by enzymes and acid in the stomach.