Final answer:
A physical change refers to a change in a substance that does not produce new substances; it maintains the substance's molecular structure and chemical identity. Melting ice, evaporating water, and dissolving sugar are all examples of physical changes.
Step-by-step explanation:
The question 'Which of the following describes a physical change?' is seeking an understanding of the concept of physical changes in chemistry. The correct answer to this question is: (b) A change that does not produce a new substance. A physical change might alter the form or appearance of a substance, but it does not change the substance's molecular structure or chemical identity.
Examples of physical changes include changing states of matter such as ice melting to water or water evaporating to steam, cutting hair, and dissolving sugar in water. In each case, the atomic composition of the substance remains the same, and no new substances are formed. This is different from a chemical change, where new substances are formed and the chemical bonds in the original substance(s) are broken and rearranged into new substance(s).