Question
A student dips a strip of metal into a liquid. Which is evidence that only a physical change has occurred? (2 points)
Group of answer choices
The metal gives off light.
The metal changes color.
The metal gives off heat.
The metal bends more easily.
Group of answer choices
The metal gives off light.
The metal changes color.
The metal gives off heat.
The metal bends more easily.
Answers
GPT-4o mini
To determine which option indicates that only a physical change has occurred, we need to look for evidence that doesn't involve a change in the composition or chemical identity of the substance.
- **The metal gives off light.** - This could indicate a chemical change, as reactions often release energy in the form of light.
- **The metal changes color.** - This can suggest a chemical change (e.g., oxidation) where a new substance may be formed.
- **The metal gives off heat.** - This also typically indicates a chemical change, as exothermic reactions release heat.
- **The metal bends more easily.** - This is a characteristic of physical change, as bending does not change the metal's chemical structure.
Therefore, the best evidence that only a physical change has occurred is **"The metal bends more easily."**
- **The metal gives off light.** - This could indicate a chemical change, as reactions often release energy in the form of light.
- **The metal changes color.** - This can suggest a chemical change (e.g., oxidation) where a new substance may be formed.
- **The metal gives off heat.** - This also typically indicates a chemical change, as exothermic reactions release heat.
- **The metal bends more easily.** - This is a characteristic of physical change, as bending does not change the metal's chemical structure.
Therefore, the best evidence that only a physical change has occurred is **"The metal bends more easily."**