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IONIC BONDS
- What are Ionic Bonds?- Writing Compounds.- Naming Ionic Bonds- Writing Ionic Compounds from names.
Bonds:
Chemical Bond – a force that holds two atoms together
Caused by:○ Attraction between ions○ Attraction of a positively charged nucleus and
the negatively charged electrons of a different atom.
Bonds: Two Types of Bonds:
Ionic Compounds○ A bond between two elements where electrons are
transferred from one element to another
Covalent Compounds○ A bond between two elements where electrons are
shared between the elements
Bonds form between the valence electrons of each atom!
Ionic Bonds:
Ionic bonds are formed between ions, and include both a metal and a nonmetal.
Ion: a charged particle
Cation: loses one or more electrons to become positively charged (metals)
Anion: gains one or more electrons to become negatively charged (nonmetals)
Ionic Bonds/Compounds:
Simple Ionic Compounds are also known as Binary Compounds
There are ONLY 2 elements present
Always a metal and a nonmetal
The elements always come from the s and p blocks on the periodic table.
Let’s Review/Practice:Element: Symbol: Oxidation State:
Iodine
Calcium
Oxygen
Neon
Carbon
Boron
Phosphorous
Sodium
Ionic Bonds: Writing Compounds Compounds MUST be neutral
Charges MUST cancel each other The metal (cation) ALWAYS comes first The nonmetal (anion) ALWAYS comes second Example:
Sodium (Na+1) and Oxygen (O -2)○ Oxygen’s -2 charge needs to be cancelled out by
sodium’s +1 charge. ○ We will need 2 sodium ions to cancel the 1 oxygen ion.
+1 + 1 + -2 = 0 (this would be neutral)So our compounds formula is: Na2O (2 sodiums and 1 oxygen)
Drop and Swap:
The method that is used to make compounds out of ions.
Bring down and over the numerical value (WITHOUT the charge sign)
Na2ODO NOT
WRITE THE 1’S
Drop and Swap:
Subscripts MUST be at the simplest whole number ratio
Calcium (+2) and Oxygen (-2)
Ca+2 O-2
Ca2O2 CaO
Drop and Swap Practice:Metal Nonmetal Drop and Swap
FormSimplest Whole Number Ratio Form
Calcium Fluorine
Barium Sulfur
Lithium Phosphorous
Magnesium Oxygen
Boron Phosphorous
Cesium Oxygen
Naming Simple Ionic Compounds
Rules to Follow:1. The name of the metal ALWAYS comes first
○ The metal’s name is the same as it is on the periodic table
2. The name of the nonmetal ALWAYS comes last
○ The nonmetal’s name changes. The ending of the nonmetal will change to “ide”
Naming Simple Ionic Compounds:
1. The name of the metal ALWAYS comes first○ The metal’s name is the same as it is on the periodic
table
2. The name of the nonmetal ALWAYS comes last○ The nonmetal’s name changes.
The ending of the nonmetal will change to “ide”
Na2O
Name the metal directly (rule 1): Sodium
Change the ending of the nonmetal (rule 2): oxide
Sodium Oxide
Naming Simple Ionic Compounds:
1. The name of the metal ALWAYS comes first○ The metal’s name is the same as it is on the periodic table
2. The name of the nonmetal ALWAYS comes last○ The nonmetal’s name changes.
The ending of the nonmetal will change to “ide”
CaCl2
Name the metal directly (rule 1): Calcium
Change the ending of the nonmetal (rule 2): chloride
Calcium Chloride
Naming Simple Ionic Compounds:
Simple Ionic Compound
Formula
Ionic Compound Name
KF
Al2O3
CaBr2
Li3P
Li2S
Practice Problem Answers:1. Sodium Sulfide
2. Barium Bromide
3. Potassium Iodide
4. Lithium Nitride
5. Gallium Sulfide
Naming Simple Ionic Compounds:
Writing Names from formulas:1. Write out the ions (symbol and charge) for each
of the elements present
2. Drop and Swap
3. Simplify if Necessary
Strontium Oxide
Sr+2 O-2
Sr2O2 SrO
Naming Simple Ionic Compounds:
Simple Ionic Compound:
Formula (not simplified)
Formula (simplified)
Sodium Nitride
Calcium Chloride
Aluminum Sulfide
Barium Fluoride
Potassium Phosphide