PROBLEM: How do substances dissolve?

PREDICTION:

PROCEDURE:

Exercise 1. beaker, water, salt, coffee filter (filter paper).

Put about 300-400 ml of water in a beaker. Wrap 4 ml of salt in the coffee filter. Barely wet the tip of the filter on the surface of the water, as shown in the diagram, and observe what happens. Draw what you see in the space below.

Record what happens.

Exercise 2. salt, sugar, hot water, cold water, spoon

Measure 200 ml of cold water in a beaker. Measure 1 ml of salt and mix it into the liquid. Record whether or not it dissolves. Keep adding and mixing salt into the solution until it stops dissolving. Fill in the chart below as you go. Repeat the process using hot water. Repeat the entire process using sugar.

CONCLUSION: What have you observed?