4. Unless you are starting a sentence, names of compounds are not capitalized.
Here are some examples for you to try. The correct names are found at the end of the tutorial:
1. NaBr ______________________________
2. CaSO4 _____________________________
3. K2S _______________________________
4. Ni(NO3)2 ___________________________
6. Fe2(CO3)3 ___________________________
7. Cr2O3 ______________________________
8. Ti(ClO4)4 ____________________________
9. AlCl3 _______________________________
10. PbC2O4 ____________________________
Naming Binary Covalent Compounds
Naming covalent compounds is easier than ionic compounds. To indicate how many of an element is present, prefixes are used:
|1 is called mono-
||6 is called hexa-|
|2 is called di-
||7 is called hepta-|
|3 is called tri-
||8 is called octa-|
|4 is called tetra-
||9 is called nona-|
|5 is called penta-
||10 is called deca-|
1. Name the first element in the compound as the element. If more than one of that element is found in the formula, use the appropriate prefix. Note that mono is never used as a prefix for the first element, when only one of that element is present.
2. Name the second element using the appropriate prefix to indicate how many and the -ide suffix at the end of the name, just as if the element were a monoatomic ion. If the element begins with a vowel, and the prefix ends with the letter a, drop the letter a in the prefix.
Here are some examples for you try. The correct names are given at the end of the tutorial:
1. CO _______________________________
2. CO2 ______________________________
3. S2F6 ______________________________
4. P4O10 _____________________________
5. N2O4 _____________________________
6. NCl3 ______________________________
7. PBr5 ______________________________
8. SiS2 _______________________________
9. N2F4 ______________________________
10. SeBr2 _________________________________
1. Some acids are formed by the addition of hydrogen ions, (H+), to a monatomic anion. To name an acid which contains a monatomic anion, drop the start the name with hydro, drop the -ide ending of the anion and add the suffix, -ic acid. For example, HBr is hydrobromic acid.
2. Oxyacids contain polyatomic anions such as nitrite, carbonate, etc. To namean acid with an anion ending with the -ite suffix, drop the -ite suffix and add the suffix, -ous acid. For example, HNO2 , would be name as nitrous acid. To name an acid with an anion ending with the -ate suffix, drop the -ate suffix and add the suffix, -ic acid. For example, H2CO3 , would be named carbonic acid.
3. The oxyacids of the Group VII elements (halogens) have more complex names because there are four different possible oxyanions. The -ite/ous acid and -ate/ic acid changes still apply, the only difference is the additional prefixes of hypo- or per- are carried along in both the anion and the acid name.
Here is an example using chlorine as the halogen:
ClO- is hypochlorite ion; the corresponding acid name is hypochlorous acid, HClO.
ClO2- is chorite ion; the corresponding acid name is chlorous acid, HClO2.
ClO3- is chlorate ion; the corresponding acid name is chloric acid, HClO3.
ClO4- is perchlorate ion; the corresponding acid name is perchloric acid, HClO4.
Answers to problems in naming ionic compounds:
1. sodium bromide
2. calcium sulfate
3. potassium sulfide
4. nickel(II) nitrate
5. magnesium nitride
6. iron(III) carbonate
7. chromium(III) oxide
8. titanium(IV) perchlorate
9. aluminum chloride
10. lead(II) oxalate
Answers to naming binary compounds:
1. carbon monoxide
2. carbon dioxide
3. disulfur hexafluoride
4. tetraphosphorus decoxide
5. dinitrogen tetroxide
6. nitrogen trichloride
7. phosphorus pentabromide
8. silicon disulfide
9. dinitrogen tetrafluoride
10. selenium dibromide
Created With HTML Assistant Pro - 05/11/2001
© Copyrght, 2001, L. Ladon. Permission is granted to use and duplicate these materials for non-profit educational use, under the following conditions: No changes or modifications will be made without written permission from the author. Copyright registration marks and author acknowledgement must be retained intact.