8/26/09

Post date: Aug 26, 2009 12:31:28 PM

Bell Ringer: Put the following items into groups and describe how you grouped them: Scissors, hat, toaster, bicycle, pencil, car, shirt, house, umbrella, and hotel.

    • Matter is classified as either an element, a compound, or a mixture

      • Elements - made of only one kind of atom

          • The types of building blocks we have

          • Marshmallows - different colors are different elements

          • The periodic table arranges elements by the properties of their atoms

              • Number represents number of protons

              • Mass is protons and neutrons, electrons have VERY little mass

              • As a class, we create a visual table of elements (drawing each atom)

          • Examples - Copper wire made of only copper atoms, aluminum foil made of only aluminum atoms

          • Social example - men or women

      • Compounds - made of two or more types of atoms

          • Marshmallows - multiple colors bonded together

          • Examples - water is hydrogen and oxygen, table salt is sodium and chlorine, sugar is hydrogen, oxygen, and carbon

          • We use chemical formulas to represent formulas

              • Use element symbol from periodic table

              • Use numbers to note how many of each atom we have bonded together

          • Social example - a couple

      • Mixtures - Elements and/or compounds are mixed together, but could be separated again

          • Marshmallows - multiple colors NOT bonded, or multiple different bonded molecules

          • Elements and compounds are pure substances, meaning their is a fixed ratio of components. Mixtures are not pure substances, meaning you could have any ratio of components in the mixture.

          • Compounds have 2 or more elements bonded together, and cannot be separated

          • The parts of mixtures are not bonded together, and can be separated

          • Can be solid in solid, liquid in liquid, gas in gas, or combinations.

          • Social example - non-couples in a room together, or couples in a room with other couples or with single people

In groups of 3-4, create another analogy for elements, compounds, and mixtures to share with the class