Circle the property/properties that would be most helpful for identifying the materials. Which would be least helpful? Explain.

* State
*Odor
* Density
*Solubility
*Reactivity
* Melting point
* Boiling point
* Flammability

The properties that would be most helpful for identifying the materials are:

- Odor: Different materials often have distinctive odors that can help in their identification.
- Density: Each material has a specific density, so measuring the density can narrow down the options and aid in material identification.
- Solubility: How a material dissolves in a particular solvent can provide valuable information about its composition and help in identification.
- Melting point: The melting point of a substance is a characteristic property that can be used to identify it since different substances have different melting points.
- Boiling point: Similar to the melting point, the boiling point is a characteristic property that helps in identifying materials.

The property that would be least helpful for identifying the materials is flammability. Flammability only indicates how easily a material can burn or catch fire, but it does not provide much information about the material's specific composition or identity.