Ionic Compounds and Acid Nomenclature
Dec 16, 2015
The force that holds two elements together.
- Bonds form to seek the lowest energy state and to meet the maximum number of valence electrons.
Chemical Bonds
Ionic Compounds
Ions= atoms or groups of atoms that have a positive or negative charge.
The difference in charge holds the two atoms together
Negative= gaining an electron (-)Positive= losing or donating an electron (+)
1. Have high melting and boiling points2. Forms Solids
3. Made from a metal and non-metal.
Ionic Compounds
If an atom is normally neutral (same # of Protons and Electrons)
AndIt donates one electron away it is no longer neutral but
positive.
So the Sodium becomes Positive known as a CationChlorine becomes Negative known as a Anion
Cation wrote as Na⁺Anion wrote as Cl¯
Cation=Metals and PositiveAnions=Non-Metals and Negative
MONOATOMIC IONS- ONLY HAVE ONE ATOM AND HAVE A SPECIFIC (+) OR (-) CHARGE.
OXIDATION NUMBER OR IONIC CHARGE- CHARGE OF A MONOATOMIC ION AND IS EQUAL TO THE NUMBER OF ELECTRONS TRANSFERRED FROM OR TO AN ATOM.
Ions
Oxidation NumbersOxidation numbers are
written as superscripts to indicate charge but are not
included in the formula.Ex: Li1+ or O2-
NAMING MONOATOMIC IONS
CationsName the element and add the word Ion.
Example: Na⁺= Sodium Ion
AnionsDrop the ending off the element name and adding
“ide”Example: O²¯= Oxide
Naming Transition Metal IonsTransition Metals have more than one Ionic
charge.Example: Iron can form two Cations
Fe²⁺ or Fe³⁺
Fe²⁺= Iron (II) ionFe³⁺= Iron (III) ion
Binary Ionic Compounds
Binary Ionic Compound- made of two ions/elements;
Naming Binary Ionic CompoundsThe cation keeps the normal name from
periodic table and the Anion receives an –ide ending.
Example:NaCl= Sodium ChlorideKI= Potassium Iodide
Writing a formula for Ionic Compounds
Binary Ionic Compounds = cation + anion1. Determine the oxidation number of
each cation and anion.2. The net charge of the compound must
equal “0”Example: Sodium Chloride
Na⁺ and Cl¯+1 and -1 =0
Formula = NaCl
Naming Simple Binary Ionic Compounds
Example 2Calcium Chloride
Ca²⁺ and Cl¯
2+ and -1 = +1Add one more Cl to = 0
Formula= CaCl₂
Naming Simple Binary Ionic Compounds
Practice!!!Potassium Iodide=
Calcium Phosphide=Magnesium Chloride=Magnesium Oxide=
Li₂O=KBr=
Metals Always Placed Before Non-Metals!!!!!!
Polyatomic Ions
Polyatomic Ions-Tightly bound group of atoms that behave as a unit and carry a charge.
Ex. SO₃²¯, ClO₂⁺
Names for Polyatomic Ions
Most of the names end with –ite or –ate but not all.
The –ite ending indicates one less oxygen than the
-ate ending.
But –ite and –ate does not determine the actual number of oxygen atoms.
Cations and Polyatomic Ions
When adding Cations (metals) to polyatomic ions add the basic element
name to the Polyatomic Ion.Example: CaSO₄ = Calcium Sulfate
Writing FormulasThe charge for the whole compound must equal “0”.
Example: Magnesium Chlorate
Writing Formulas with Cations and Polyatomic Ions
The charge for the whole compound must equal “0”.Example: Magnesium Chlorate
Magnesium= +2 and Chlorate = -1We must have 2 chlorate for the
compound to equal Zero.Formula= Mg(ClO₃)₂
When adding an extra Polyatomic Ion Use Parenthesis and add desired amount behind.
Ionic Compounds with Transition Metals
Naming1. Recognize the metal is a transition metal.
FeCl₂Fe = Iron a transition metal unknown charge
2. Use the Non-metal to determine the charge of the transition metal.
Chlorine charge = -1 x 2 = -23. The charge of the whole compound must equal zero.
Iron must have a +2 Charge
Name of FeCl₂ = Iron (II) Chloride
Naming AcidRules
Anion Ends In –ideHydro- stem-ic Acid
Example with Chlorine = Hydrochloric AcidAnion Ends In –ite
Stem of Anion –ous AcidExample with Sulfite= Sulfurous Acid
Anion Ends In –ateStem of Anion-ic Acid
Example with Nitrate= Nitric Acid
Acids
Acids- compounds that produce hydrogen ions when dissolved in water
Acids to KnowHydrochloric Acid=HCl
Sulfuric Acid= H₂SO₄Nitric Acid= HNO₃
Acetic Acid= HC₂H₃O₂Phosphoric Acid= H₃PO₄
Carbonic Acid= H₂CO₃
Naming Covalent/Molecular Compounds
Covalent Compounds are made of two non-metals.
Pre-fixes are used to indicate the number of atoms in each compound.
Naming Covalent/Molecular Compounds
Rules1. The first element name is given followed by
the second with an “ide” ending.2. The first element gets a prefix if more than
one.3. The second element always gets a prefix.
ExamplesNO=Nitrogen MonoxideN₂O= Dinitrogen MonoxideN₂O₄=Dinitrogen TetraOxide
Naming Covalent/Molecular Compounds
FormulaCopper(II) Sulfate = CuS
Roman Numeral = Charge of your MetalUse the Roman Numeral to figure out the
charge on your non-metal.
Copper (II) equals + 2 Charge
The total charge on the whole compound must still equal 0.
Molecular Compounds
Molecular Compounds or when two atoms of different elements create bonds.
Examples: CO₂, H₂O, PCL₃
Characteristics:1. Low melting points and Low boiling points
2. Form liquids or gases.3. Made from two or more non-metals
MOLECULE-MADE UP OF TWO OR MORE ATOMS OF THE
SAME ELEMENT.EXAMPLES: 0₂ (OXYGEN YOU BREATHE)
O₃ (OZONE)Molecules and Bonds
Ionic Bonds Vs. Covalent Bonds
Ionic Bonds Covalent Bonds
Bonded together by the attraction of opposite charges
(+ and -)
Bonded together by the sharing of electrons
Electrons are donated/transferred and taken giving one atom a (+) charge and the other a (-) charge.
Electrons are shared between both atoms charges remain the same.
Polar Molecule Non-Polar Molecule
Made of a metal and non-metal Made up of two non-metals
Weaker Bonds Stronger Bonds