Two friends are discussing physical and chemical changes. Anna says that when you eat, it is a physical change because when you chew, the food is only being changed into smaller pieces. Elsa says that when you eat, it is a chemical change because your body digests the food as the chemicals in your body break down the food into energy. Who is right?
A) Anna
B) Elsa
C) Both girls are correct
D) Neither girl is correct
Both girls are discussing two different times.
Yes, chewing food is a physical change as it is breaking large pieces into smaller pieces. After the smaller pieces are formed then digestion takes over and that is a chemical change. I would go with Anna being correct WHILE CHEWING. Elsa is correct for anything after that.
So they are both correct
C) Both girls are correct.
Anna is correct in saying that chewing is a physical change because the food is being mechanically broken down into smaller pieces. This is a change in size, shape, or state of matter, but it does not result in any new substances being formed.
Elsa is also correct in saying that digestion is a chemical change. In the process of digestion, the enzymes and acid in the digestive system break down the food into simpler molecules that can be absorbed and utilized by the body. This is a chemical change because the chemical composition of the food is being altered.
So, both Anna and Elsa have valid points and are correct in their explanations.
C) Both girls are correct.
Explanation:
Both Anna and Elsa are partially correct in their statements. Eating involves both physical and chemical changes.
Anna is correct in saying that chewing the food is a physical change. When you chew, the food is broken down into smaller pieces through mechanical action. However, this is only one part of the overall process.
Elsa is also correct in saying that eating involves a chemical change. Once the food is broken down into smaller pieces, it enters the digestive system, where digestive enzymes and stomach acid chemically break down the food further. This process is known as digestion, and it involves the breakdown of complex food molecules into simpler molecules that can be absorbed by the body. These molecules are then used to provide energy, support growth, and maintain various bodily functions.
Therefore, both physical and chemical changes occur when you eat. The physical change happens when you chew the food, and the chemical change occurs during the digestion process within the body.