Monday, February 3, 2020

SCH 3U/4C - Nomenclature - Binary Compounds

This type of compound contains only two different elements in any ratio.  Since these compounds are ionic in nature, they typically contain a metal and a non-metal.

Rules for Writing a Name from a Formula
1.     Write down the name of the element with the lower electronegativity (usually a metal) first.
2.    Remove the ending on the name of the second element (usually a non-metal) and add “-ide” ending.

ex.(a)  KI          potassium iodide
     (b)  AlCl3     aluminum chloride
     (c)  Na2S     sodium sulfide

C4-
carbide
N3-
nitride
O2-
oxide
F-
fluoride

P3-
phosphide
S2-
sulfide
Cl-
chloride

As3-
arsenide
Se2-
selenide
Br-
bromide


Te2-
telluride
I-
iodide



At-
astatide


Rules for Writing a Formula from a Name
1.     Write down symbols for the two elements, in the order they appear in the name.
2.    Place the valence of the first element above the first symbol.
3.    Place the valence of the second element above the second symbol.
4.    Use the ‘criss-cross’ rule and write the numbers as subscripts.
5.    Reduce the subscript numbers to the simplest ratio.

Ex.(a)  rubidium nitride               Rb1   N3 ↝  Rb3N
     (b)  magnesium phosphide    Mg2   P3   Mg3P2
     (c)  calcium oxide                   Ca2   O2   Ca2O2    CaO

 
Want a bit more binary goodness?  Check out this video.


Homework
Give the correct formula for the following.
1.     sodium sulfide            
2.    calcium phosphide
3.    hydrogen iodide
4.    magnesium hydride
5.    barium oxide
6.    potassium oxide
7.    barium chloride
8.    aluminum oxide
9.    cadmium oxide
10.  francium oxide
11.  silver sulfide
12.  zinc chloride
13.  calcium iodide
14.  rubidium fluoride
15.  calcium chloride
16.  silver bromide
17.  beryllium fluoride
18.  lithium bromide
19.  potassium phosphide
20. aluminum hydride
21.  lithium oxide
22. barium bromide
23. aluminum carbide
24. strontium nitride
25. cadmium bromide
26. magnesium carbide
27. cesium nitride
28. zinc nitride
29. lithium selenide
30. beryllium telluride

Give the correct name for the following.
1.     NaCl       
2.    MgO
3.    CaO
4.    BBr3
5.    MgS
6.    CaCl2
7.    AlBr3
8.    Rb4C
9.    Al2O3
10.  Li2O
11.  NaAt
12.  Be3P2
13.  BeF2
14.  AlCl3
15.  HCl
16.  SrCl2
17.  Na2O
18.  K3N
19.  Li3P
20. BaF2
21.  MgI2
22. K2S
23. SrO
24. Al2S3
25. SrF2
26. Ag2S
27. RbI
28. Al2O3
29. MgO
30. KBr
 
Answer Keys: