Vocabulary Chemical Bond –a–a–a–attractive force between atoms or ions that binds them together as a unit –b–b–b–bonds form in order to… iiiincrease.

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Vocabulary Chemical Bond –a–a–a–attractive force between atoms or ions that binds them together as a unit –b–b–b–bonds form in order to… iiiincrease stability Courtesy Christy Johannesson

Formation of Cation 11p + sodium atom Na e-e- loss of one valence electron e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- sodium ion Na + 11p + e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

Formation of Anion 17p + chlorine atom Cl e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- gain of one valence electron chloride ion Cl 1- 17p + e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

Chemical Bonding  atoms give up or gain electrons and are attracted Na loses an e – Na  Na 1+ + e – (Metal) Cl gains an e – Cl + e –  Cl 1– (Non-Metal) ionic compounds = saltsNa 1+ + Cl 1–  NaCl K 1+ + NO 3 1–  KNO 3 where NO 3 1– is a polyatomic ion: a charged group of atoms that stay together

Formation of Ionic Bond chloride ion Cl 1- sodium ion Na + 11p + e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- 17p + e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e- e-e-

Ionic Bonding n = 2 Na [Ne]3s 1 n = Cl [Ne]3s 2 3p 5 Na + [Ne] Cl - [Ne]3s 2 3p 6 NaCl Transfer of electrons to achieve a stable octet (8 electrons in valence shell).

Properties of Ionic Compounds VERY HARD each ion is bonded to several oppositely- charged ions HIGH MELTING POINTS many bonds must be broken BRITTLE with sufficient force, like atoms are brought next to each other and repel

Writing Chemical Formulas

The Swap n Drop Method The Swap n Drop method is an easy way to determine the formula of any ionic compound. The Swap n Drop method is an easy way to determine the formula of any ionic compound. The ionic compound can be the simple (binary) ionic compound with just two elements, or one that has a polyatomic ion as part of it. The ionic compound can be the simple (binary) ionic compound with just two elements, or one that has a polyatomic ion as part of it. You can get the oxidation values directly off of the periodic table for most elements or they are part of the “Polyatomic Cheat Sheet”. You can get the oxidation values directly off of the periodic table for most elements or they are part of the “Polyatomic Cheat Sheet”.

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Calcium and Nitrogen 1. Ca N 2. Ca 2+ N Ca 3 N 2

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Be Br 1. Be Br 2. Be 2+ Br BeBr 2

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Lithium Oxide: 1. Li O 2. Li 1+ O Li 2 O

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Magnesium Nitride: 1. Mg N 2. Mg 2+ N Mg 3 N 2

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Lithium Chloride: 1. Li Cl 2. Li 1+ Cl LiCl

Formulas With Transition Metals The Swap n Drop method is also used when dealing with metals that have more than one oxidation number. (Copper, Iron, Lead, or Tin) The Swap n Drop method is also used when dealing with metals that have more than one oxidation number. (Copper, Iron, Lead, or Tin) The oxidation number for these metals can be found in the name of the compound that contains them. The oxidation number for these metals can be found in the name of the compound that contains them. Examples: Examples: –Iron (II) oxide – the Iron (Fe) used here has an oxidation number of 2 –Lead (IV) sulfide – the Lead (Pb) used here has a oxidation number of 4.

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Iron (III) Oxide: 1. Fe O 2. Fe 3+ O Fe 2 O 3

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Lead (II) Chloride: 1. Pb Cl 2. Pb 2+ Cl PbCl 2

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Copper (I) Phosphide: 1. Cu P 2. Cu 1+ P Cu 3 P

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Tin (II) Sulfide: 1. Sn S 2. Sn 2+ S Sn 2 S SnS

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Lead(IV) Oxide: 1. Pb O 2. Pb 4+ O Pb 2 O PbO 2

Polyatomic Ions Polyatomic ions are clusters of atoms that stay together as one unit and carry an overall charge. Most polyatomic ions are negatively charged. Polyatomic ions are clusters of atoms that stay together as one unit and carry an overall charge. Most polyatomic ions are negatively charged..

Polyatomic Ionic Compounds Parenthesis You need more than one polyatomic ion in your formula…This means that you will have to use brackets. Use parenthesis whenever you need more than one polyatomic ion in the formula. You need more than one polyatomic ion in your formula…This means that you will have to use brackets. Use parenthesis whenever you need more than one polyatomic ion in the formula. Example: Iron (III) nitrate… Example: Iron (III) nitrate… –Start with symbols and combining capacities… Fe 3 NO 3 1 – –After the Swap n Drop, you may get one of two possibilities…   FeNO 33 OR Fe (NO 3 ) 3 The second option is right because it says you need two nitrate clusters to go with every iron atom. The first option, which did not use reads as one iron atom and thirty-three oxygen atoms. The second option is right because it says you need two nitrate clusters to go with every iron atom. The first option, which did not use reads as one iron atom and thirty-three oxygen atoms. Fe(NO 3 ) 3 is the correct formula! Use the parenthesis! Fe(NO 3 ) 3 is the correct formula! Use the parenthesis!

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Sodium Nitrate: 1. Na NO 3 2. Na 1+ (NO 3 ) Na(NO 3 )

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Calcium Chlorate 1. Ca ClO 3 2. Ca 2+ (ClO 3 ) Ca(ClO 3 ) 2

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Lithium Phosphate: 1. Li PO 4 2. Li 1+ (PO 4 ) Li 3 (PO 4 )

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Aluminum Sulfate: 1. Al SO 4 2. Al 3+ (SO 4 ) Al 2 (SO 4 ) 3

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Tin (IV) Carbonate: 1. Sn CO 3 2. Sn 4+ (CO 3 ) Sn 2 (CO 3 ) Sn(CO 3 ) 2 Reduce!

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Ammonium Phosphate: 1. NH 4 PO 4 2. NH 4 1+ PO ( NH 4 ) 1+ ( PO 4 ) (NH 4 ) 3 ( PO 4 )

Swap it and Drop it Steps (in order) 1. Write the chemical symbols. 2. Write the oxidation numberover the symbols. 2. Write the oxidation number over the symbols. 3. Swap it and Drop it. 4. Reduce – if necessary- the same numbers or a 2 & 4 together. Magnesium Carbonate: 1. Mg CO 3 2. Mg 2+ (CO 3 ) Mg 2 (CO 3 ) Mg(CO 3 ) Reduce!