1. When a homemade oil and vinegar salad dressing is left standing, it separates into layers. The salad dressing is a:
A. solution
B. suspension
C. colloid
D. compound
2. Which of the following is not an example of a physical property?
A. density
B. hardness
C. flammability
D. melting point
3. Which material is a poor conductor of heat?
A. iron
B. wood
C. silver
D. copper
Answer (2)
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.
The salad dressing is a suspension due to the layers formed when oil and vinegar separate. Flammability is not a physical property but a chemical property. Lastly, wood is a poor conductor of heat compared to metals like iron and copper.
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