Ionic Bonds and Ionic Compounds

Properties of Ionic Compounds Solids at room temperature Atoms arranged in a 3D pattern High melting points Conduct an electric current when melted or dissolved in water Fluorite CaF2 Pyrite FeS2

Review Compound: two or more elements chemically combined in a fixed ratio

Formation of Ionic Compounds Composed of (non-metal) anions and (metal) cations Example: Sodium Chloride

Formation Continued Electrically neutral Metal gives their electrons to the non-metal creating an ionic bond

So What’s Happening? Na Cl +1 +1 Na Cl Cation Anion Opposites Attract

Ionic Bonds Want 8 valence/full outer shell Example: Sodium Chloride Sodium: 1s22s2sp63s1  Na Chlorine: 1s22s22p63s23p5  Cl

Practice: Hydrogen and Bromine

Practice: Potassium and Iodine

Practice: Magnesium and Oxygen

Practice: Hydrogen and Oxygen (you may need more than one of each type of atom)

Practice: Hydrogen and Carbon (you may need more than one of each type of atom)

Practice: Potassium and Nitrogen (you may need more than one of each type of atom)

Practice: Calcium and Sulfur (you may need more than one of each type of atom)

One of the following pairs will form an ionic bond, one won’t One of the following pairs will form an ionic bond, one won’t. Draw out the one that will form the bond and describe why the other pair won’t bond. Lithium and Magnesium Zinc and Oxygen

Chemical Formula A written representation of a substance using symbols for its elements Subscripts Show how many of each TYPE of atom are in the compound Example: Water H2O

Naming and Writing Formulas For Ionic Compounds

Binary Compound Composed of two elements Can be ionic or molecular

Chemical Formula for Ionic Compounds Cinnabar HgS Chemical Formula for Ionic Compounds Formula Units Lowest whole-number ratio of the ions in a compound Example: Sodium Chloride NaCl

Magnesium Chloride

Calcium Nitride

Naming Ionic Compounds Cation FIRST Keeps name of element Anion SECOND Add an –ide ending Number of each element DOES NOT MATTER Example: NaCl MgCl2 Sodium Chloride Magnesium Chloride

Hand out Common Ion List

What’s Going On?! Copper (i) Oxide Copper (ii) Oxide

Is it Cu+1 or Cu+2? CuS Cu2S

Grab a whiteboard and let’s practice!

Chemical Formula Practice: What is the formula for Aluminum Bromide?

Practice: Predict the formula if Oxygen and Potassium form an ionic bond.

Practice: Predict the formula if Copper(ii) and Nitrogen form and ionic bond.

One of the following pairs will form an ionic bond, one won’t One of the following pairs will form an ionic bond, one won’t. Draw out the one that will form the bond and describe why the other pair won’t bond. Argon and Oxygen Barium and Carbon

Practice: Write the correct formula for the compounds formed from each pair of ions Potassium and Sulfur Calcium and Oxygen

Practice: Write the formulas for each compound Barium Chloride Lithium Oxide

Practice: Which pairs of elements are likely to form ionic compounds? A. Cl and Br B. Li and Cl C. K and He D. I and Na