6 VETERINARY STATE BOARD 



Electricity: By electrolysis, water is split into hydrogen and 

 oxygen. 



How many elements are there? 



There are about eighty known elements. 



Give the S3mibol and atomic weight of each of the following elements : 

 chlorine, hydrogen, nitrogen, oxygen, potassium and 

 sodium. 

 Chlorine, CI, 35.2; hydrogen, H, 1; nitrogen, N, 14; oxygen, 

 0, 16 ; potassium, K, 39 ; sodium, Na, 23. 



Name five elements. Give the symbol and one principal use of each 

 element named. 



Carbon, C, is the chief element of coal. 

 Phosphorus, P, is used in matches. 

 Arsenic, As, is used in medicine. 

 Copper, Cu, is used in the arts. 

 Chlorine, CI, is used as a bleaching agent. 



Define incompatibility. Name three forms and give an example of each. 



Incompatibility is that relation between medicines which ren- 

 ders their admixture unsuitable. There are three forms, viz., chemi- 

 cal, physical or pharmaceutical, and physiological or therapeutic. 



A chemical incompatibility exists when a new compound is 

 formed, as silver nitrate and sodium chloride form silver chloride ; 

 a physical, when an unsightly appearance is produced, as when 

 resinous tinctures are added to aqueous solutions, the resins sepa- 

 rate; a physiological, when there is an antagonistic action between 

 the drugs, as atropine, which checks secretion, and pilocarpine, 

 which stimulates glandular activity. 



Write the chemical formula for (a) sulphuric acid, (b) nitric acid, (c) 

 potassiimi iodide, (d) copperas, (e) epsom salts. 

 (a) H,SO„ (b) HNO3, (c) KI, (d) FeSO,, 7H,0, (e) MgSO,, 

 TH^O. 



What is meant by synthesis? Name two products that can be made 

 this way. 

 Synthesis is the artificial building up of a chemic compound 

 by the union of its elements. 



Water can be made by uniting hydrogen and oxygen. Cupric 

 oxide can be made by heating metallic copper in the air. 



What is meant by diffusion of gases ? Describe an experiment to illus- 

 trate diffusion of gases. 

 A diffusion, similar to that of liquids, takes place when two 



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