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Chapter 1: Problem 102

Which of the following are chemical changes? Which are physical changes? a. the cutting of food b. interaction of food with saliva and digestive enzymes c. proteins being broken down into amino acids d. complex sugars being broken down into simple sugars e. making maple syrup by heating maple sap to remove water through evaporation f. DNA unwinding

Short Answer

Expert verified
Physical changes: a. the cutting of food, e. making maple syrup by heating maple sap to remove water through evaporation, and f. DNA unwinding. Chemical changes: b. interaction of food with saliva and digestive enzymes, c. proteins being broken down into amino acids, and d. complex sugars being broken down into simple sugars.

Step by step solution

01

a. the cutting of food

The cutting of food involves changing the size and shape of the food without altering its chemical composition. Therefore, it is a physical change.
02

b. interaction of food with saliva and digestive enzymes

The interaction of food with saliva and digestive enzymes involves chemical reactions that break down the food into simpler substances. This process changes the chemical composition of the food. Thus, it is a chemical change.
03

c. proteins being broken down into amino acids

The breakdown of proteins into amino acids involves chemical reactions that transform the proteins into different substances (amino acids). This means the chemical composition of the substances has changed, so it is a chemical change.
04

d. complex sugars being broken down into simple sugars

The process of breaking down complex sugars into simple sugars involves chemical reactions that change the substances' chemical composition. Therefore, it is a chemical change.
05

e. making maple syrup by heating maple sap to remove water through evaporation

Making maple syrup by heating maple sap involves removing water through evaporation, which results in a change in physical appearance and state but not in the chemical composition of the maple sap. As a result, it is a physical change.
06

f. DNA unwinding

DNA unwinding is a process where the double helix structure of DNA temporarily separates into two single strands. This unwinding does not involve any chemical change in the DNA's composition; instead, it involves a change in its physical structure. Thus, it is a physical change.

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