Water Worksheet-7

Water Worksheet-7

 

Fill in the blanks:

  1. The reservoir of water over the hard rock below the surface of the earth is called ___. 
  2. _____ is universal solvent.                                                 
  3. ______ gram of pure water at 4° C occupies a volume of 1 cc. 
  4. A solution which can’t dissolve more of a solute at a given temperature is called ____ at that temperature.                                                  
  5. The maximum amount of solute which will dissolve in 100 g of water at a given temperature so as to form a saturated solution is called ________ of the substance at that temperature.                                         
  6. Hard water forms _____ with soap.                                  
  7. The process of decomposition of the molecules of a substance with passage of electric current is called_____.                                          
  8. Water can be easily broken by passing ______through it.        
  9. A dissolved gas in natural water necessary for respiration is ____.    

 

True/False Questions:

  1. Water is a chemically stable substance.
  2. Rain water is a poor conductor of electricity.
  3. The water in rivers & lakes is fit for drinking.
  4. Seawater is good for irrigation.
  5. Hard water is good for dying clothes.
  6. Water containing calcium bicarbonate produces scum with soap.
  7. In sedimentation process, alum is added to increase the precipitation of impurities (loading).
  8. The boiling point of water is directly proportional to atmospheric pressure.
  9. Water shows anomalous expansion.
  10. The volumetric composition of water is hydrogen & oxygen in the 2:1.
  11. Water pipe lines can be prevented from bursting in cold areas by wrapping them with gunny bags or straw.

 

Answer key:

  1. Underground water
  2. water
  3. 1 or one
  4. Saturated solution
  5. Solubility
  6. Scum
  7. Electrolysis
  8. Electric current
  9. Oxygen
  10. True
  11. False
  12. False
  13. False
  14. False
  15. True
  16. True
  17. True
  18. True
  19. True
  20. True