Part II 

 (Answer five qtcestions from Part II. Extra questions will receive no credit.) 



6. Indicate the basic oxides in the following list, and write the names of the 



compounds formed by heating them with the acid anhydrides in the list: 

 phosphorus pentoxide, calcium oxide, silicon dioxide, sulphur trioxide, and 

 aluminium oxide. 



7. Compare and contrast the properties and uses of the two chlorides of mercury. 



Give the scientific and the common names; also the formulas of these com- 

 pounds. 



8. a) What volume would be occupied by 14 grams of carbon monoxide under 



standard conditions ? (O = 16, C = 12.) 



b) If ten liters of carbon monoxide under standard conditions are heated to 



27 . 3° C, without change in pressure, what volume will tlie gas occupy ? 



c) What volume of oxygen is necessary to combine with five liters of carbon 



monoxide under the same conditions of temperature and pressure? 

 Show how you arrive at your conclusion. 



9. A certain chemical compound is found by analysis to contain 92.3 per cent 



of carbon and 7 . 7 per cent of hydrogen. WTiat is the simplest formula 

 which can express its composition ? If the molecular weight is 78, what 

 is the formula ? (C = 12, H = 1 .) 



10. a) If steam is passed over heated iron, iron oxide and hydrogen are formed; 



if hydrogen is passed over heated iron oxide, metallic iron and steam 

 are formed. W^hy are the products of reaction different in the two 

 cases? 

 h) Under what conditions will a chemical reaction reach equilibrium ? Under 

 what conditions will it run to an end ? 



11. Define the term "molecular weight," and give one method for determining a 



molecular weight. 



12. How may ozone be prepared ? What are its properties ? How is its formula 



written ? How would you demonstrate its chemical composition (not its 

 formula) ? 



13. a) Give the names and formulas of two alcohols, together with the name 



and formula of the acid derived from each. 

 b) Outline a process for tlie commercial production of grain alcohol and state 

 some of its industrial uses. What is denatured alcohol ? 



14. a) Outline a method for the manufacture of nitric acid from atmospheric 



nitrogen or from ammonia, {b) Enumerate at least two of the 

 important commercial uses of nitric acid. 



15. a) Name three classes of food substances and list several food substances 



which are typical in each class. 

 b) Describe tests by which the nature of a simple food substance may be 

 determined. 



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