80 



127. Illustrations of the elementary course of inorganic 

 chemistry. See " Outline of experiments suitable for 

 " illustrating elementary instruction in chemistry." 



1890. 



The apparatus is arranged to show : 



A colourless gas different from air is formed when a taper 

 burns. 



Water is formed when a candle burns. 



Water and carbonic acid gas result from the burning of coal 

 gas. 



Air has weight. 



Air diminishes in bulk when phosphorus is burned in it. 



Some diminution takes place slowly when a stick of phos- 

 phorus is exposed to the air at ordinary temperatures. 



Phosphorus increases in weight on burning. 



Iron tilings increase in weight on oxidising. 



Oxygen is given off when the red substance obtained by 

 gently heating mercury in the air is strongly heated. 



There is a difference in the air before and after its passing 

 through the lungs. 



Ordinary articles of food contain carbon. 



The decomposition of water by the electric current. 



The synthesis of water by exploding a mixture of hydrogen 

 and oxygen. 



Hydrogen is formed by the action of sodium upon water. 



Hydrogen is the gas obtained by the passage of steam over 

 red-hot iron. 



Hydrogen may be obtained by the action of dilute sulphuric 

 acid upon zinc. 



The combustibility of hydrogen. 



A candle will not burn in hydrogen. 



The lightness of hydrogen. 



Copper increases in weight if, when in a red-hot state, oxygen 

 is passed over it. 



Water is formed, and the copper oxide reduced, when hydrogen 

 is passed over the latter substance. 



The separation of impurities from water by distillation. 



The separation of impurities from water by filtration. 



The preparation of oxygen from strongly heated potassium chlo- 

 rate, or a mixture of potassium chlorate and manganese dioxide. 



The formation of ozone by the silent electric discharge. 



If sulphur is burnt in a current of oxygen the product fumes 

 slightly in the air. 



Preparation of hydrogen by the acting upon sodium hydroxide 

 with zinc. 



Water is without any action upon copper at any temperature. 



The divisibility of hydrogen. 



The reducing power of hydrogen. 



Hydrogen bubbled through ferric chloride does not reduce it, 

 but if hydrogen is generated in the solution of ferric chloride it 

 does. 



