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

Answer 1

It can’t be broken down into different types of atoms or can’t be broken down Into different types of molecules

Answer 2

The correct answer is that a pure substance cannot be physically broken down into different types of atoms.