Notes: Writing Names and Formulas of Compounds
Notes: Writing Names and Formulas of Compounds
Ionic Compounds = between _____________& ________________
*Signs that show you the name is ionic = ________________
Given Ionic Compound Name ( Want to Write Ionic Compound Formula
1. Look to see if it is binary or polyatomic Sodium oxide
2. Write symbol of metal,
3. Write symbol for non-metal
4. Determine oxidation number Calcium nitride
5. Criss-cross
6. Write formula
*Signs that show you the formula is ionic = ______________________
Given Ionic Compound Formula ( Want to Write Ionic Compound Name
1. Look to see if it is binary or polyatomic Mg3P2 Na2S
2. Write name of metal
3. Write name of non-metal, drop last
Syllabal and add -ide
Practice – Binary Ionic Compounds
sodium bromide beryllium chloride calcium selenide magnesium sulfide
aluminum oxide lithium phosphide cesium arsenide gallium selenide
Write the names of the following binary ionic compounds. Do these exercises without using any outside resources.
Na2O RbI LiBr CaF2
Cs3P MgO Ga2O3 AlN
Covalent Compounds = between ____________ & ______________
Practice - Binary Compounds of the Nonmetals
Write the formulas of the following molecules.
carbon tetrachloride dihydrogen monosulfide phosphorus triiodide sulfur dibromide
boron trifluoride dioxygen difluoride tetraphosphorus decaoxide sulfur hexafluoride
Write the names of the following molecules.
N2H4 OF2 SBr2 BCl3
Special Case 1: Ionic Compounds w/ Transition Metals
Practice –Ionic Compounds w/ Transition Metals
Write the formulas of the binary ionic compounds listed below. Do these exercises without using any outside resources.
cobalt(III) chloride lithium arsenide platinum(IV) fluoride nickel(II) sulfide
chromium(III) oxide beryllium nitride titanium(II) chloride iron(III) iodide
Write the names of the following binary ionic compounds. Do these exercises without using any outside resources.
MnF2 Ni3P2 PbS2 Cs2S
ScCl3 MgI2 PbS CuSe
Special Case 2: Ionic compounds w/ Polyatomic Ions
*Signs that show you this compound name has a polyatomic ion = ________________
Given Polyatomic in Compound Name ( Want to Write Ionic Compound Formula
1. Look to see if it is a Binary compound or if it contains a Polyatomic ion.
2. Write the symbols, look on your polyatomic ion table for symbol
3. Determine Oxidation State
4. If the metal is a transition element its oxidation
number will be written as a roman numeral.
5. Criss-cross
6. Write formula with correct subscripts.
7.
*Signs that show you the formula will need a polyatomic = ______________________
Given Ionic Compound Formula w/ Polyatomic ion ( Want to Write Ionic Compound Name
1. Identify if it is a binary compound of in it contains a polyatomic ion.
2. Look to see if metal is a transition element.
3. If it is a transition metal then spread your elements and do a backwards criss-cross. This gives you the oxidation number.
4.Write the name of the metal, include Roman numeral for transition metals.
5. Write the polyatomic ion.
Practice –Ionic Compounds w/ Polyatomic Ions
Use the rules you have determined above to write the formulas of the following ionic compounds.
iron(III) acetate aluminum hydroxide strontium sulfate Lead(II) phosphate
copper(I) sulfite ammonium nitride potassium cyanide magnesium carbonate
Use the rules you have determined to write the names of the following ionic compounds.
Cu(OH)2 Sn(C2H3O2)2 Zn3(PO4)2 Pb(NO3)2
NaHCO3 FeCO3 NH4F MgSO4
Special Case 3 – Naming Acids and Bases
Practice –Naming Acids and Bases
Write the formulas of the following acids and bases.
hydrofluoric acid hydroselenic acid carbonic acid lithium hydroxide
nitrous acid cobalt (II) hydroxide sulfuric acid beryllium hydroxide
Write the names of the following acids and bases.
HCl Mg(OH)2 Ba(OH)2 HClO2
HClO4 Fe(OH)2 Zn(OH)2 HC2H3O2
-----------------------
*Signs that show you the name is covalent = ________________
Given Covalent Compound Name ( Want to Write Covalent Compound Formula
I. Writing Formulas for Binary Molecular Compounds-those containing 2 nonmetals. Prefix naming system - know theses prefixes:
|Prefix / Value |Prefix / Value |
|Mono 1 |Hexa 6 |
|Di 2 |Hepta 7 |
|Tri 3 |Octa 8 |
|Tetra 4 |Nona 9 |
|Penta 5 |Deca 10 |
Simply write what it says. Ex: phosphorus pentachloride PCl5 dihydrogen monoxide H2O
*Signs that show you the formula is covalent = ______________________
Given Covalent Compound Formula ( Want to Write Covalent Compound Name
1. The less electronegative element is given first. It is given a prefix only if it contributes more than one atom to a molecule of the compound. (All this means is that you will never start with mono-)
2. The second element is named by combining a prefix indicating the number of atoms contributed by the element to the root of the name of the second element and then adding –ide to the end.
The o or a at the end of a prefix is usually dropped when the word following the prefix begins with another vowel. (monoxide or pentoxide)
*Signs that show you this compound name requires different steps = ________________
Given Roman Numerals in Compound Name ( Want to Write Ionic Compound Formula
1. Look to see if it is binary or polyatomic 1. Iron III Chloride
2. Write symbol of transition metal,
3. Write symbol for non-metal
4. Determine oxidation number of metal
by looking at Roman Numeral
5. Criss-cross
6. Write formula
*Signs that show you the formula will require roman numerals = ______________________
Given Ionic Compound Formula w/ Transition metal ( Want to Write Ionic Compound Name
3. Identify if it is a binary compound of in it contains a polyatomic ion.
4. Look to see if metal is a transition element.
3. If it is a transition metal then spread your elements and do a backwards criss-cross. This gives you the oxidation number.
4.Write the name of the metal, include Roman numeral for transition metals.
6. Write the anion adding “ ide”
Examples
1. Iron III Chloride 2. Copper II Sulfide
Examples
1. CoCl2 2. Fe2O3
Examples
1. Magnesium sulfate 2. Iron (II) nitrate
Examples
1. CuSO4 2. Ca(C2H3O2)2
*Signs that show you this compound name is for an acid= ________________
Given Compound Name ( Want to Write Compound Formula
1. Is the acid binary or polyatomic?
2. Write the symbols
3. Determine oxidation numbers
4. Criss Cross
5. Write formula
*Signs that show you the formula contains an acid = ______________________
Given Compound Formula ( Want to Write Compound Name
Does the compound contain a polyatomic ion?
If No – always start with hydro, then the root of the second element, and end with -ic.
If Yes – polyatomic is present –
If the polyatomic ends in –ate, change it to –ic.
If the polyatomic ends in –ite, change it to –ous.
Example: HNO3 Nitric acid
HNO2 Nitrous acid
Examples
Hydrobromic Acid Sulfurous Acid
HCl HNO3
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