SCH 3U - Nomenclature - Molecules, Atoms & Elements

Most elements are available in nature as atoms.  For example, carbon, sodium and tin are simply C, Na and Sn.  However, several elements are found as molecules in nature.  For instance, when a chemist speaks of a reaction in which oxygen (or oxygen gas) is a reactant, she means that O₂ is being used.  Similarly, when a teacher tells you that the main component of the atmosphere is nitrogen, he means N₂, not N.  Likewise, the halogens occur naturally as diatomic molecules.

ex. (a)  Cl₂           chlorine OR chlorine gas

      (b)  K              potassium

      (c)  S₈             sulfur

Homework

Give the correct name for the following.

1.     Cl₂

2.    Hg

3.    O₂

4.    S₈

5.    Mg

6.    P₄

7.    Br₂

8.    Si

9.    F₂

10.  Fe

11.  I₂

12.  H₂

13.  C

14.  Li

15.  N₂

Nomenclature Review

Answer the following questions using any previous naming system that will provide appropriate names and formulae. 

Give the correct formula for the following.

1.     sodium chromate

2.    aluminum sulfide        

3.    tin (IV) chloride                   

4.    chromium (III) hydroxide

5.    dinitrogen tetroxide  

6.    cobalt (III) oxide

7.    calcium phosphate      

8.    hydrogen sulfate

9.    sodium carbonate

10.  cupric sulfate             

11.  mercury (II) bromide

12.  iron (III) sulfate                 

13.  copper (II) chloride   

14.  calcium nitride           

15.  cobalt (II) chloride    

16.  dichlorine monoxide   

17.  tetraphosphorus decasulfide

18.  lead (IV) sulfide

19.  chromium (VI) oxide  

20. chromium (III) oxide 

21.  ammonium sulfide                 

22. magnesium chlorate    

23. aluminum phosphate

24. cesium selenide

25. mercuric chloride

26. zinc phosphate           

27. aluminum nitride         

28. silicon dioxide            

29. lead (II) nitrate

30. stannic iodide

Give the correct name for the following.

1.     NaCl       

2.    CaBr₂   

3.    ZnS

4.    H₂O       

5.    FeCl₂   

6.    SnCl₂     

7.    N₂

8.    PCl₃     

9.    SF₆      

10.  CO         

11.  CaSO₄ 

12.  PF₅      

13.  KBr      

14.  Na₂S      

15.  CO₂        

16.  NaClO₃   

17.  Cu(CN)₂  

18.  Al₂(SO₄)₃         

19.  BaCO₃    

20. AsI₃       

21.  Al(OH)₃  

22. NH₄OH

23. K₃P

24. KCN

25. AlN

26. KMnO₄

27. Al(ClO₃)₃

28. CuSO₄

29. SCl₆     

30. CO₂

 

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