`Concentration vs SolubilityTherese Donatello              Archbishop Weber H. S.                               5252 W. Palmer St.                               Chicago IL 60639                               (312) 637-7500          Objectives:1. The student will be able to distinguish between concentration and solubility.2. The student will be able to tell which solution is more concentrated.Materials Needed:Bingo chips              Petri dishes            beansbottles                  eye droppers            food colorwater                    table salt              talcum powderhot plate                wax paper               spoonsStrategy:1. Ask the students to count the number of Bingo chips in each of the Petri    dishes.  They will see that one has more chips than the other.  Explain that    the one that has more chips is said to be more concentrated.  Repeat using    dishes containing various amount of beans.  Have the students rank the    containers from the highest to the lowest concentration. 2. Have the students fill a bottle half way with water.  Add table salt (one    spoonful at a time while stirring) and have them describe what happens as    each spoonful is added until no more dissolves.  Then have them do the same    thing using talcum powder.  Explain that the table salt when it dissolves is    said to be soluble while the talcum powder which does not dissolve is said to    be insoluble.  Ask the students to predict what will happen if you use hot    water instead of room temperature water.  Then have them repeat the    demonstration using the hot water. 3. Have the students place one drop of food color on a piece of wax paper and    then add nine drops of water to the drop of food color.  On a piece of paper    have the students draw ten circles and label the first one with the number    one.  Ask the students to take one drop from #1 and place it on another spot    on the wax paper along with nine drops of water.  Ask the students what part    of this solution is from the spot numbered one. Explain that one part is from    #1 so one out of ten drops is from #1. Have the students label the second    circle 1/10.  Have them repeat this procedure for the remaining eight    circles.   Performance Assessment:1. Students in the lower grades will be able to explain concentration by    counting the amount of a substance in a given amount of space.  They will be    able to tell the difference between concentration and solubility by seeing if    the substance will dissolve in water or not. 2. Students in the middle grades will be able to distinguish between    concentration and solubility when conditions such a temperature change. 3. Students in the upper grades will be able to tell concentration in a    mathematical way as part of a whole. `