100 



WATER AND ITS EVERYDAY USES 



or a clay pipe. Dip the end of the glass tube into the soap solution. 

 Remove quickly. When the bubble is an inch or two in diameter, 



tutfck 



4. 

 basket/ 



shake it off and watch its movement. Do not have any flame 

 near the hydrogen generator. When mixed with air, hydrogen 

 will explode violently upon the application of a flame. 



2. MAKE DISTILLED WATER 



Devise an apparatus using things 

 you have at home and make distilled 

 water for the automobile battery. 



3. CRYSTAL MAKING 



Make crystals by allowing saturated 

 solutions of salts to evaporate slowly. 

 Suspend strings in the liquid for the 

 crystals to cling to. They will also 

 form on the vessel holding the solution. 

 Salts that are good for this are : com- 

 mon table salt, alum, potassium dichro- 

 mate, and copper sulphate. If you 

 start with a hot saturated solution, 

 crystals will start to form as the solu- 

 tion cools. Make a basket form of 

 cotton-insulated wire #20. Suspend this 

 in a hot saturated solution of potassium 

 dichromate. A beautiful crystal orna- 

 ment will be produced by allowing 

 crystals to grow upon this for 24 hours. 



\\idC- - 

 concentrated 

 f salt. ^ 

 I -Solution 



SCIENCE CLUB ACTIVITIES 



1. TOY RIVER BARGES 



Materials needed: Three half walnut shells; three small cork 

 stoppers ; stick of wood about size of pencil ; paraffin. 



Preparation: Cut the corks into halves and fasten them with 

 paraffin to the ends of the shells so that there will be a smooth 



