Science

Chemical Tests
Lesson 5 Exploring Water Mixtures
Solution	When a solid material is completely dissolved in water, it is a solution. Sugar water is one example. Salt water is another. Can you think of any other water soluble solids and their solution names? Hint, a cool drink!
Water Mixture	A solid material that is not dissolved, when put in water, forms a water mixture. The water insoluble solid particles keep their size and shape in a water mixture. A bunch of large rock salt in water may appear as a water mixture, but given time they will be dissolved. A bunch of real fine solids in water may appear as a solution but it may really be a water mixture.
Filter & Filter Paper	Filter is a device that can let liquid flow through and leave solids behind. Paper can be used as a simple filter because it has pores (porous) that can let liquid flow through.
Filtration	Water Insoluble Solids keep their size and shape in a water mixture. Filter paper can be used to filter out the solids and let the water flow through. This process (letting liquid passing through and separating out solids) is called filtration. Filter paper can have real small pores (even micron size) for stopping tiny solids not visible to human eyes. However, using microscope, you may still see the real tiny solids that have sneaked through the filter paper.
Your Tools 5 toothpicks Previous Lesson SIS Science Page at http://www.scrammble.com/sisscience5.html Next Lesson
What to learn? Water Mixture and Filtration for separating out 'unknown' insoluble solids How? 1. Use the above tools to prepare water mixtures (place solids of measured amount in water of 'known' quantity) 2. Observe which are solutions and which are water mixtures. (discuss with class/team on the observed facts from the water mixture and water solution and enter them into your test result table for each 'unknown' chemicals. 3. Use filter paper to filter out the insoluble solids from the water mixture to find out how many of the five solids are insoluble?