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Multiple Choice
Which of the following is a physical process?
A
Digesting food in the stomach
B
Rusting of iron
C
Baking a cake
D
A protein chain folding
Verified step by step guidance
1
Understand the difference between physical and chemical processes. A physical process involves changes in the state or appearance of a substance without altering its chemical composition, while a chemical process involves a change in the chemical composition of a substance.
Analyze each option to determine if it involves a chemical or physical change. Digesting food in the stomach involves breaking down food molecules, which is a chemical process.
Consider the rusting of iron. This involves the reaction of iron with oxygen to form iron oxide, a new substance, indicating a chemical process.
Evaluate the process of baking a cake. This involves chemical reactions such as the Maillard reaction and the formation of new compounds, making it a chemical process.
Examine the folding of a protein chain. Protein folding involves the physical rearrangement of the polypeptide chain into a specific three-dimensional structure without altering the chemical composition of the amino acids, making it a physical process.