38 



A FEW CHEMICAL CHANGES 



r'>()0 CO. of liydrogen peroxide, of the 

 streusjctli mentioned above, were placed in 

 the bottle just described, and put in the 

 (lark Avitlioiit l>eino' under the action of 

 radium. The volume of g'as enclosed over 

 the li([nid was 350 cc. The variations in 

 pressure as <>bs(>rved by the ])ressure gauge 

 were recordetl for three hundred hours. 

 After correcting this pressure for the varia- 

 tions due to changes of temperature and 

 pressure, it was found that the pressure of 

 the enclosed gas had not varied, showing 

 that the peroxide had not suffered any 

 decom]>osition during the time it was under observation. 



Next an experiment was carried out, similar to that just 

 described, except that the surface of the peroxide was bom- 

 barded by radium radiations. The increase in pressure was 

 recorded frr)m time to time, and the results obtained are 

 tabulated in the following table: 



Table I. 



m 



Fi^ 2. 



Time in 

 hours. 



Barometric 

 pressure 

 mm. Kg. 



Temperature 

 °C. 



Height of 



liquid in 



manometer 



division.s.l 



Increase Corrected 



in pressure increase in 



of gas ' pressure of 



mm. Hg. gas mm. Hg. 







761.0 



19.1 



145.0 







7 



762.01 



18.8 



149.9 



0.5 



1.7 



15 



762.11 



18.0 



157.3 



1.1 



4.4 



30 



764.10 



18.8 



160.2 



1.4 



4.1 



40 



763.90 



19.2 



165.0 



2.0 



2.7 



50 



764.01 



18.0 



156.0 



1.0 



5.8 



75 



761.39 



17. 1 



151.3 



0.6 



6.4 



100 



767.11 



16.6 



155.5 



1.0 



10.9 



118 



764.31 



16.8 



163.0 



1.9 



10.0 



142 



766.01 



17.9 



167.0 



2.2 



8.4 



165 



764.02 



18.0 



162 1 



1.9 



6.7 



200 



765.13 



18.0 



160.1 



1.4 



6.8 



219 



764 . 99 



18.1 



158.4 



1.3 



6.3 



238 



764.41 



18.1 



155.0 



1.0 



5.6 



265 



760.99 



19.5 



163.0 



1.9 



0.8 



20 scale divisioiia = 25 mm. 



