388 APPLIED SCIENCE 



Questions 



1. What is an opaque body? A translucent body? A trans- 

 parent body? 



2. Name the physical properties of a paint; of varnish. 



3. What effect has heat on dry paint? 



4. What is a solvent? 



5. Does wood absorb paint? What property of matter has 

 wood that allows it to do this? 



6. Putty adheres to paint. What property of matter has 

 putty that allows it to do this? 



7. Name the physical properties of putty. 



8. Is the body of paint soluble or insoluble in water? Explain. 



9. Explain the chemical action of the absorption of oxygen by 

 linseed oil. 



10. What is a drying oil? 



11. Explain the manufacture of linseed oil. 



12. On what principle of science is a volatile constituent sepa- 

 rated from linseed oil? 



13. Does heat always have a tendency to thicken a liquid? 

 Explain. 



14. Why is it necessary to remove all trace of sulphuric acid in 

 bleaching linseed oil? Would sulphuric acid affect metals and wood? 



15. Explain the chemistry of the action of "driers." 



16. What is the meaning of viscosity? 



17. Explain the manufacture of turpentine. 



18. Will turpentine burn? What are the products formed from 

 the complete burning of it? 



19. What are resins? Name their physical properties. 



20. Explain the meaning of the statement that white lead is a 

 basic carbonate of lead. 



21. Explain the physical properties of white lead. 



22. Why is heat necessary in making white lead? 



23. Explain the disadvantages of such organic compounds as 

 aniline dyes or paints. 



24. Lead sulphide is black. Explain why white lead and other 

 lead paints are not used indoors where they may be exposed to coal 

 fumes which contain sulphur. 



25. Explain the theory of coloring as applied to mixed paints. 



