Which of the following observations would indicate that a material is a pure substance? It does not dissolve i

Question

Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.

GPT-5 mini · Answer

Only the third observation.

Explanation:
- "It does not dissolve in water." — Not diagnostic: many pure substances are insoluble, and many mixtures are insoluble too.
- "It changes color after heating." — Not diagnostic: both pure substances and mixtures can change color on heating (physical or chemical change).
- "It cannot be physically broken down into different types of atoms." — Diagnostic of a pure substance: a pure substance has a uniform composition and cannot be separated into different substances by physical means (mixtures can).

Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.

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Which of the following observations would indicate that a material is a pure substance? It does not dissolve in water. It changes color after heating. It cannot be physically broken down into different types of atoms.

All Answers 1

Submit Your Answer

Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
It changes color after heating.
It cannot be physically broken down into different types of atoms.