236. CATECHISM OF 



does water take the gaseous form ? In wha 1;, the Hquid ? 6. In 

 what, the solid ? 6. 



What is chemical affinity'? 7. Of how many kinds is it? 7. 

 What is simple affinity ? 7. Single elective f 7. Double elec- 

 tive f 7. 



How is a compound to be distinguished from a mixture P 8. 



What bodies are said to be soluble f 9. What insoluble ? 9. 

 What is a liquid that will dissolve a body called ? 9. What is a 

 solution f 9. What is the great solvent in nature ? 9. 



Are there degrees of solubility f 10. How much quick-lime 

 will water dissolve ? 10. How much gypsum ? 10. How much 

 common salt? 10. 



What is a general law of combination? 11. Explain this? 11. 



What is another law of combination? 12. W^ll you explain 

 this? 12. 



How many elements are known ? About 60. How many of 

 these constitute essentially all objects with which we are conver- 

 sant? 13. Will you give the names of those 15? 14. 



What is Oxygen? 15. What portion of air does it constitute? 

 15. Of water? 15. Of all known matter ? 15. 



What is Chlorine? 16. In what form might ^ it be supplied to 

 soil? 16. For what crops ? 16. 



What is Sulphur? 17. What more can you say of it? 17. 



W^hat is Phosphorus? 18. What is it apart of? 18. How dif- 

 fused? 18. 



What is car6on .^ 19. Of what does it form a part ? 19. 



What is silicon ? 20. What part of the solid globe does it prob- 

 ably form ? 20. What is it in its pure state ? 20. When com- 

 bined with oxygen ? 20. 



What is nitrogen? 21. What part is it of the air ? 21. What 

 does it constitute with oxygen ? 



What is hydrogen? 22. How light? 22. What part of water? 

 22. Will it burn ? 22. Does it cause other bodies to burn ? 22. 



What is iron? 23. What is said of it? 23. 



What is manganese ? 24. How found, and where ? 24. 



l^hdiXis potassium? 25. What is said of it ? 25. 



What is sodium? 26. What is said of this? 26. 



What is calcium ? 27. Why are limy soils called calcareous ? 27. 



What is magnesium ? 28. Of what is it the basis ? 28. 



What is aluminum? 29. Of what is this the basis? 29. 



Which of the fifteen elements are gases when uncombined? 

 30. What of the other eleven ? 30. 



Which are metals proper? 31. Which are metals of alkalies? 

 32. '^hich. o^ alkaline earths? 32. 



Which are called organic elements ? 33. Why ? 33. 



What are the letters written after the names of substances 

 called? 35. What is their use? What does stand for? 35. 

 CI? 35. K? 35. Na? 35. Fe? 35. 



