THE ALUMNI JOURNAL 125 



9. CARBOHYDRATES, (a) Define carbohydrates, explaining by 

 suitable formula, (b) Name three principal groups of carbo- 

 hydrates giving example of each group, (c) What is meant by 

 an asymmetric carbon atom? (d) Explain difference between 

 a "biose" and a "monose"? (e) Name two typical tests for 

 monoses ? 



10. Five grammes of a certain sample of spirit of nitrous ether yielded 

 50 Cc. of N2O2 gas at 754 mm. pressure and 20°C. i Cc. of 

 N2O2 gas at 0° and 760 mm. pressure weighs 0.00134 

 grammes. What percentage by weight, of ethyl nitrite, 

 C2H5XO2 is found in the sample of spirit? 



ANALYTICAL CHEMISTRY. 



Spring, 1913. 



Qualitative. 



1. Why are some anions mutually reactive? Give five instances of 



such reactions. How is the presence of organic anions indi- 

 cated in preliminary testing? 



2. Under what conditions will all anions of the first group react with 



the group reagent? Why is the solution acidified before the 

 reagent for the second group is added? Which acid is used? 



3. Enumerate the tests you consider necessary to identify, in separate 



solutions, these anions : carbonate, phosphate, tartrate, iodide, 

 chlorate. 



4. In what way does the presence of metals other than the alkali 



metals interfere with the detection of many anions? By what 

 treatment are the interfering metals removed before analysis? 



5. How would you identify the following anions in the presence of 



each other: nitrate and sulfate; chloride and cyanide; sulfide 

 and bromide. 



6. Name the solvents that can be employed to bring about a solution 



of substances insoluble in water. With what reagents is any 

 residue left undissolved in these solvents treated in order to 

 dissolve or decompose the compounds present ? 



Oiiantitatii'e. 



7. What important operations are involved in the determination of 



substances by the volumetric method ? How is the quantity of 

 the component sought obtained? 



