Naming CompoundsOnline version Naming and Writing the formula for ionic and covalent compounds by Eric D Norman 1 An Ionic Compound is between _________ Select one or more answers a metal and metal b metal and nonmetal c nonmetal and nonmetal 2 Which answer below represents the oxidation state of aluminum then oxygen? a Al+2 and O-2 b Al+3 and O+2 c Al+3 and O-2 d Al-3 and O+2 3 Which answer is the molecular formula for aluminum oxide? a Al3O2 b Al2O3 c AlO d Al3O3 4 You try! Which answer below is the molecular formula for potassium oxide? a K2O b P2O c KO d PO 5 In naming ionic compounds with transition metals, the roman numeral tells you the ___________. Written answer 6 Which of the following answers below is the molecular formula for iron (III) oxide? a FeO b Fe2O3 c Fe3O2 d Fe2O2 7 You try! Write the molecular formula for nickel (I) oxide. Written answer 8 The prefix hepta- stands for... a 5 b 6 c 7 d 8 9 Covalent compounds consists of . . . a metal and metal b metal and nonmetal c nonmetal and nonmetal d 8 10 What is the molecular formula for diphosphorus pentoxide? a PO b P2O3 c P2O5 d P3O2 11 You try! What is the molecular formula for trinitrogen hexasulfide Written answer 12 Which of the answers below is the formula name for N3O6? a nitrogen oxide b trinitride hexaoxide c trinitrogen hexaoxide d nitride hexoxide 13 You try! Write the formula name for P3Cl5. Written answer Explanation 1 Remember that ionic compounds consist of metal and nonmetal and covalent compounds consist of two nonmetals. You can determine a metal from a nonmetal by looking at your periodic table. Most periodic tables will have a key indicating the type of elements. 2 Remember: All elements in Group 1 have an oxidation number of +1; Group 2 = +2; Group 13 = +3; Group 15 = -3; Group 16 = -2 and Group 17 = -1 3 Remember: All elements in Group 1 have an oxidation number of +1; Group 2 = +2; Group 13 = +3; Group 15 = -3; Group 16 = -2 and Group 17 = -1 4 element symbol for potassium is K; the oxidation states: K+1 and O-2; you use the swap technique and you have 2 K atoms and 1 O atom. So the formula would be K2O 5 As a reminder: Roman Numeral I = 1 Roman Numeral II = 2 Roman Numeral III = 3 Roman Numeral IV = 4 Roman Numeral V = 5 6 As a reminder: Roman Numeral I = 1 Roman Numeral II = 2 Roman Numeral III = 3 Roman Numeral IV = 4 Roman Numeral V = 5 7 As a reminder: Roman Numeral I = 1 Roman Numeral II = 2 Roman Numeral III = 3 Roman Numeral IV = 4 Roman Numeral V = 5 8 Copy the following if you did not get it off of the video: mono- = 1 di- = 2 tri- = 3 tetra- = 4 penta- = 5 hexa- = six hepa- = 7 octa- = 8 nona- = 9 deca- = 10 9 Copy the following if you did not get it off of the video: mono- = 1 di- = 2 tri- = 3 tetra- = 4 penta- = 5 hexa- = six hepa- = 7 octa- = 8 nona- = 9 deca- = 10 10 Copy the following if you did not get it off of the video: mono- = 1 di- = 2 tri- = 3 tetra- = 4 penta- = 5 hexa- = six hepa- = 7 octa- = 8 nona- = 9 deca- = 10 11 The prefix tri- means 3, so you have 3 nitrogens. The symbol for nitrogen is N. The prefix hexa means 6, so you have 6 sulfurs. The symbol for sulfur is S. Therefore the answer would be: N3S6 12 The prefix tri- means 3, so you have 3 nitrogens. The symbol for nitrogen is N. The prefix hexa means 6, so you have 6 sulfurs. The symbol for sulfur is S. Therefore the answer would be: N3S6 13 In the formula, you have 3 phosphorus atoms. The prefix for 3 is tri-. You have 5 chlorine atoms. The prefix for 5 is penta-. When you put it together: 3 phosphorus = triphosphorus and 5 chlorine atoms = pentachloride. Remember for the second nonmetal you drop the -ine and add the -ide.
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