CHEM 110 
                  Answers to Eleventh Take Home Quiz
                                                                            
  1. What carbohydrate reats with water in the presence of a 
     suitable enzyme to form glucose and fructose ?  .sucrose.  
                                                                            
  2. What carbohydrate can not be metabolized by humans but can be 
     metabolized by cattle and termites ?  .cellulose.  
                                                                            
  3. Match the following.  
       d  found in nail polish remover           a) ethanol 
       a  found in alcoholic beverages           b) acetic acid 
       c  preserves animal tissue                c) formaldehyde 
       b  found in vinegar                       d) acetone 
                                                                            
  4. Write the formulae of ammonia and nitric acid and give the 
     important industrial uses of each.  
          NH3  - fertilizer & nitric acid production 
                                                                            
          HNO3 - fertilizers and explosives 
                                                                            
  5. Draw the structure of phosphate ion.  
                                                                            
                                O 
                                |  
                             O-ÍPÍO-  
                                º  
                                O-  
                                                                           
  6. Why is arsenic so toxic ?  
      Because it replaces phosphate in metabolic compounds, 
      disrupting the ability of the compound to properly function.  
                                                                            
  7. Oxygen is the most abundant element in the earth's crust.  
     Name abundant natural materials composed of compounds of 
     oxygen.  
    Water, quartz, calcium carbonate, silicates, aluminosilicates 
                                                                            
  8. Name one of the most important industrial uses of chlorine.  
                         making PVC plastics 
                                                                            
  9. Which group of elements is the least chemically reactive?
                              Group 18