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.
It can be physically broken down into different types of molecules.

GPT-5 mini · Answer

Correct answer: "It cannot be physically broken down into different types of atoms."

Why: A pure substance (element or compound) has a definite composition and cannot be separated into other substances by physical means. For example, water (a pure compound) cannot be physically separated into hydrogen and oxygen atoms — chemical change is required. The other observations (insoluble in water, color change on heating, or being physically separable into different molecules) do not reliably indicate a pure substance.

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.
It can be physically broken down into different types of molecules.

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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. It can be physically broken down into different types of molecules.

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.
It can be physically broken down into different types of molecules.