Naming Compounds Tutorial And Worksheet With Answers Page 9
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20Writing the Formulas of Covalent Compounds
1) Write the symbol/formula of the first element in the compound’s name, then the
symbol/formula of the second ion in the compound’s name.
2) Indicate how many of each element the molecule contains using subscripts after the atomic
symbol.
•
The numbers of atoms are given in the molecule’s name in Greek prefixes
•
NOTE: If there is no Greek prefix in front of the first element in the name, that
means the number is 1.
Example: Write the formula of dinitrogen tetrafluoride.
1) Write the symbol/formula of the first element in the compound’s name, then the
symbol/formula of the second ion in the compound’s name.
N F
2) Indicate how many of each element the molecule contains using subscripts after the atomic
symbol.
N F
•
The numbers of atoms are given in the molecule’s name in Greek prefixes.
•
dinitrogen tetrafluoride
•
see your chapter 3 notes for a list of the Greek prefixes
N
F
2
4
•
NOTE: If there is no Greek prefix in front of the first element in the name, then
the number is 1.
•
Example carbon tetrachloride = CCl
4
Example: Write the formula of carbon disulfide.
1) Write the symbol/formula of the first element in the compound’s name, then the
symbol/formula of the second ion in the compound’s name.
C S
2) Indicate how many of each element the molecule contains using subscripts after the atomic
symbol.
C S
•
The numbers of atoms are given in the molecule’s name in Greek prefixes.
•
carbon disulfide
•
see your chapter 3 notes for a list of the Greek prefixes
C
S
= CS
1
2
2
•
NOTE: If there is no Greek prefix in front of the first element in the name, then
the number is 1.
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