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1919 

 CHEMISTRY 



Friday, June 20 2 p.m. Two hours 



Answer nine questions as indicated below. No extra credit will be given for more 

 than nine questions. 



Attach to the answer, in each case, the number and letter used in the printed paper. 



* 



Part I 



(Answer all questions in this part. Each question counts 12.) 



1. Describe a method for the laboratory preparation of three of the following 



substances: (a) sodium nitrate, {b) ethyl alcohol, (c) barium sulphate, 

 {d) hydrochloric acid. WTiat property has the desired product in each 

 case which makes it possible to separate it ? 



2. Write equations for the following reactions, using formulas throughout. To 



receive credit, the equations must be correct in every particular. 



(a) Chlorine (gas) + hydrogen (gas) = 



{h) Sodium carbonate + carbon dioxide +water = 



(c) Ammonium carbonate+ copper (cupric) chloride = 



{d) Ferric oxide+ carbon (heated) = 



{e) Ammonia completely burned in oxygen = 



(/) Silver sulphate4-zinc = 



3. (a) How many grams of sodium hydroxide will be required to neutralize 



9 . 8 grams of sulphuric acid ? Name the products formed and 

 determine the weight of each product. (Atomic weights: H 1, O 16, 

 Na 23, S 32.) 



ih) What volume will one Hter of gas at 136.5° absolute have at 136.5° C, 

 pressure remaining the same ? 



4. How could you show ex'perimentally that — 



(a) fused calcium chloride is a deUquescent substance ? 



{b) carbonic acid is unstable ? 



(c) nitric acid is an oxidizing agent ? 



{d) diamond is a form of carbon ? 



{e) sugar is not an electrolyte ? 



(/) a hydrocarbon contains hydrogen ? 



5. (a) Show by formulas how an anhydride is related to the corresponding acid 



or base. 



{b) Suggest, by writing appropriate equations, four different methods for 



making calcium sulphate from calcium, oxygen, sulphur trioxide, and 1^ 



water. 



(THIS EXAMINATION IS CONTINUED ON PAGE 2) 

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