1. when a homemade oil and vinegar salad dressing is left standing, it separates into layers. the salad dressing is a? solution, suspension, colloid, compound 2.which of the following is not an example of a physical property? density, hardness, flammability, melting point 3. which material is a poor conductor of heat? iron, wood ,silver, copper

The salad dressing is known as a compound dressing. A compound is simply a combination, or mixture, of two or more ingrediants.
Physical properties include, density, hardness, melting, and boiling points. Flammability is considered a chemical property along with vapor, concentration, etc.
Wood is not a reliable conductor for heat, while Copper is considered the best.

Hi, your answer is not correct. this is a cumulative  

I'm not sure what your asking buddy.. but i know that you can weld two peices of steel by pure force and pressure.