Which of the following is an example of only a physical change?(1 point)

Responses

the smell of rotten eggs

the green color of the Statue of Liberty

the creation of table salt

dry ice becoming vapor

3 answers

The option that is an example of only a physical change is:

"the green color of the Statue of Liberty"

This green color is due to the patina formed on the copper surface as a result of oxidation over time. It is essentially copper carbonate, which forms when copper oxidizes and results from exposure to moist air over a prolonged period. The underlying copper has not changed into a different substance, but rather its surface has undergone a physical reaction with the environment, changing the appearance but not the chemical composition of the copper.
what is the correct answer
Apologies for the confusion. The correct example of a physical change from the options provided is:

"dry ice becoming vapor"

This process is known as sublimation, where dry ice (solid carbon dioxide) changes directly from a solid to a gas without going through a liquid phase. This is strictly a physical change because the substance remains carbon dioxide before and after the change; its state of matter is what changes.