98 WATER AND ITS EVERYDAY USES 



One reason you do not notice the adulteration of sugar with sand 

 is that the particles look alike and they are all completely dis- 

 solved in water. 



THE REVIEW SUMMARY 



In preparing a summary of what you have learned in this unit, 

 you will want to place emphasis on the big ideas which have come 

 out of the applications of the facts you have learned and the 

 demonstrations you have seen. These big ideas we call generaliza- 

 tions. For this unit they are as follows : 



1. Water in all its three states, solid, liquid, and gas, produces 

 important changes on the earth. 



2. Water is a compound that can be separated into its elements. 



3. Through a variety of changes in state, water passes through 

 a cycle in nature. 



Before making your review summary, test your knowledge of 

 the facts of the unit by checking over the text so as to be sure you 

 know the facts underlying the generalizations. Then, using the 

 generalizations, the material in the text, and everything you have 

 read, seen, or done yourself, make a summary outline for your note- 

 book. This outline you may use when you make a recitation. 



TEST ON FUNDAMENTAL CONCEPTS 



Make two vertical columns in your workbook. Head one CORRECT 

 and the other INCORRECT. Under the first place the numbers of all state- 

 ments you believe to be correct. Under the second place all the numbers 

 of the statements you believe to be incorrect. Your grade = right answers 

 X 3. 



I. The air receives water from : (1) the ocean ; (2) breathing 

 animals ; (3) condensation of moisture ; (4) living plants ; (5) deep- 

 sea fish. 



II. When common salt is dropped slowly into boiling water: 

 (6) it forms crystals on the bottom of the dish ; (7) a solution 

 results ; (8) an emulsion is formed ; (9) the water becomes a 

 solvent ; (10) the salt is a solvent. 



III. Water is a compound whose molecules are composed of : 

 (11) two atoms of hydrogen; (12) like atoms; (13) oxygen and 



