Question
Which of the following demonstrates a chemical change?
iron reacting to water and oxygen to form iron oxide
steam condensing on a mirror
sugar and water mixing to create sugar water
dry ice vaporizing
iron reacting to water and oxygen to form iron oxide
steam condensing on a mirror
sugar and water mixing to create sugar water
dry ice vaporizing
Answers
GPT-4o mini
The option that demonstrates a chemical change is:
**Iron reacting to water and oxygen to form iron oxide.**
This is a chemical change because it involves a reaction that transforms the iron into a different substance (iron oxide), involving a change in the chemical composition.
The other options are physical changes:
- Steam condensing on a mirror is a change from gas to liquid.
- Sugar and water mixing to create sugar water is a solution (physical mixture), not a chemical change.
- Dry ice vaporizing is a change from solid to gas (sublimation), which is also a physical change.
**Iron reacting to water and oxygen to form iron oxide.**
This is a chemical change because it involves a reaction that transforms the iron into a different substance (iron oxide), involving a change in the chemical composition.
The other options are physical changes:
- Steam condensing on a mirror is a change from gas to liquid.
- Sugar and water mixing to create sugar water is a solution (physical mixture), not a chemical change.
- Dry ice vaporizing is a change from solid to gas (sublimation), which is also a physical change.