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Theory

 A word equation describes a chemical reaction using words.

 

1. In the naming of compounds between metals and non-metals

  • metallic elements are named first
  • non-metallic elments are named second and the suffix is changed to to an "ide"
Non metal Suffix change   Non metal Suffix change
Hydrogen Hydride   Fluorine Fluoride
Oxygen Oxide   Chlorine Chloride
Sulfur or sulphur Sulfide or sulphide   Bromine Bromide
Nitrogen Nitride   Iodine Iodide
Phosphorus Phosphide   Astatine Astatide

 Examples: Sodium chloride, magnesium oxide, sodium fluoride and potassium iodide.

 

2. In all chemical reactions mass is conserved. Atoms of elements are rearranged.

  • Iron + oxygen → iron chloride Oxygen atoms do not change into chlorine atoms!
  • Iron + oxygen → iron oxide The same type of atoms are on opposite sides on the equation

 

Complete the following word equations

1.  +  oxygen   →  magnesium oxide

2. magnesium +  chlorine   →  

3. sodium +    →  sodium nitride

4. sodium +  oxygen   →  

5. potassium +  iodine   →  

6.  +  bromine   →  potassium bromide

7. barium +    →  barium oxide

8. zinc +    →  zinc nitride

9.  +  iodine   →  calcium iodide

10.  +  fluorine   →  lithium fluoride

11. iron +    →  iron oxide

12. sodium +  iodine   →  

13.  +  fluorine   →  calcium fluoride

14. cobalt +  chloride   →  

15. calcium +    →  calcium bromide

16. nickel +  chlorine   →  

17.  +  hydrochloric acid   →  zinc chloride + hydrogen

18. potassium iodide +    →  potassium chloride + iodine

19.  +  sodium sulfate   →  barium sulfate + sodium chloride

20.  +  aluminum   →  aluminum oxide + iron

Molar Mass
 

Formula Calculator