Question
Which of the following demonstrates a chemical change?
iron (Fe) reacting to water ((H2O)) and oxygen (o) to form iron oxide (Fe2O3)
steam condensing on a mirror
sugar and water mixing to create sugar water
dry ice vaporizing
iron (Fe) reacting to water ((H2O)) and oxygen (o) to form iron oxide (Fe2O3)
steam condensing on a mirror
sugar and water mixing to create sugar water
dry ice vaporizing
Answers
GPT-4o mini
The scenario that demonstrates a chemical change is:
**Iron (Fe) reacting to water (H2O) and oxygen (O) to form iron oxide (Fe2O3).**
In this reaction, the iron undergoes a chemical change as it reacts with water and oxygen to form a new substance (iron oxide).
The other options involve physical changes:
- **Steam condensing on a mirror** is a physical change as it involves a phase change from gas to liquid.
- **Sugar and water mixing to create sugar water** is a physical change, because the sugar dissolves in water but does not change its chemical structure.
- **Dry ice vaporizing** is also a physical change, as it involves a phase change from solid to gas.
Therefore, the only option that involves a chemical change is the formation of iron oxide.
**Iron (Fe) reacting to water (H2O) and oxygen (O) to form iron oxide (Fe2O3).**
In this reaction, the iron undergoes a chemical change as it reacts with water and oxygen to form a new substance (iron oxide).
The other options involve physical changes:
- **Steam condensing on a mirror** is a physical change as it involves a phase change from gas to liquid.
- **Sugar and water mixing to create sugar water** is a physical change, because the sugar dissolves in water but does not change its chemical structure.
- **Dry ice vaporizing** is also a physical change, as it involves a phase change from solid to gas.
Therefore, the only option that involves a chemical change is the formation of iron oxide.