V. WATER, AND ITS USES 



SOME PROPERTIES OF WATER 



1. Which of all the things needed to keep us alive causes 

 suffering most quickly when withheld? Which next? 

 What is the price we need to pay ordinarily for either ? How 

 do you account for this? 



2. Taste water from different glasses, one glass having 

 in it salt, another sugar, another vinegar. Then taste of 

 pure water. What property of pure water is shown? 



3. Smell ammonia water cautiously; then pure water. 

 Name another property of pure water. 



4. Look at a pencil through glass. Put the pencil in 

 water, and look at it through water. What other property 

 of water is shown? Explain the muddy appearance of 

 some rivers. 



5. Name several substances that dissolve readily in 

 water. Name a few that do not. What solvent power has 

 water as compared with other liquids? If water did not 

 dissolve most substances, what would be true (a) of the 

 digestibility of our foodstuffs; (6) of their taste? Name 

 some substances unsuited for food because they are so slow 

 to dissolve. 



6. Pour water into dishes of different shapes, and state 

 the form taken by the water in every case. Why is this? 

 Make a distinction between solid and liquid states of 

 matter. 



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