11/13/08

Post date: Nov 13, 2008 1:12:14 PM

Bell Activity: Give a complete description of the machine on the green table.

Physical properties

    • Characteristics that can be observed without changing the identity of the substance

    • Help identify a substance

    • Can be observed or measured

      • Color

      • Melting point

      • Boiling point

      • Strength

      • Hardness

      • Magnetism

      • Conductivity

      • Density

    • Help determine uses for a substance

Density

    • Is mass / volume

    • Is a physical property

    • Is constant for a given substance

    • Can be used to identify a material

    • Is DIFFERENT FROM WEIGHT!!!!!

      • People use "light" and "heavy" for weight and for density

      • Many would say a brick sinks in water because it is "heavy" -- actually, it is because the brick is more dense than water. A boat, which is much "heavier" than a brick, will float in water because it is less dense than water.

    • M&M density activity

    • Density Lab due Monday (lab can be found in "handouts" section)