358 SMITH'S INTERMEDIATE CHEMISTRY 



When the same matter decays under water, it gives methane (p. 

 346). Explain the difference in the result. 



2. What is the density (air = 1) of (a) methane, (b) ethylene? 



3. Write the graphic formula? for propane, propyl chloride, 

 propyl alcohol, dipropyl ether, propionaldehyde, propionic acid, 

 dipropyl ketone, propyl propionate. 



4. Write the graphic formula? for toluene, phenol, nitrobenzene, 

 aniline. 



5. (a) Given a flame of hydrogen burning in a jar of air, what 

 would be the effect on the flame of lowering the pressure of the 

 air by means of an air pump? (b) What would be the effect on 

 the average temperature of the flame? (c) How about the heat 

 produced by burning 1 g. of hydrogen in each case? (d) What 

 differences would be observed in using an alcohol lamp at the 

 bottom and on the top of a high mountain? 



6. (a) In the candle or gas flame, what is the source of the 

 light? (b) Why does such a flame become smoky when placed 

 in a draft? 



