Naming Compounds Tutorial And Worksheet With Answers Page 17
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20Writing the Names of Covalent Compounds
1) List the name of the first element in the formula.
2) List the second element and add the –ide suffix.
3) Use Greek prefixes to indicate the number of each atom in the formula.
•
Exception: do not use mono- for the first element in the name.
•
The o or a at the end of the Greek pre-fix is usually dropped when the element
name begins with a vowel
Example: Write the name for N
S
2
4
1) List the name of the first element in the formula.
nitrogen
2) List the second element and add the –ide suffix.
nitrogen sulfide
3) Use Greek prefixes to indicate the number of each atom in the formula.
•
See your textbook or lecture notes for a table of the Greek prefixes.
____nitrogen _____sulfide
dinitrogen tetrasulfide
•
Exception: do not use mono- for the first element in the name.
•
Not applicable in this example
•
The o or a at the end of the Greek pre-fix is usually dropped when the element
name begins with a vowel
•
Not applicable in this example
Example: Write the name for SO
3
1) List the name of the first element in the formula.
sulfur
2) List the second element and add the –ide suffix.
sulfur oxide
3) Use Greek prefixes to indicate the number of each atom in the formula.
____ sulfur _____ oxide
sulfur trioxide
•
Exception: do not use mono- for the first element in the name.
•
NOTE, we did not write monosulfur because of this rule!
•
The o or a at the end of the Greek pre-fix is usually dropped when the element
name begins with a vowel
•
Not applicable in this example
17
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