Nomenclature Naming Compounds. Naming Binary Ionic Compounds.
Ionic Naming
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Transcript of Ionic Naming
Ionic Naming
Warm Up
1. Your little brother is eating a twix. What are two ways you can get some of that twix?
2. Is it easier to share belongings between two people that are similar or two people that are different? Give examples!
EQ: How do we name ionic compounds?
HOT Q1: What is the difference between molecular and ionic compounds?
HOT Q2: What are the rules for writing the ionic formula from the name?
HOT Q3: What are the rules for writing the name from the formula?
Agenda
• Warm Up• Agenda• Rehash Molecular• Ionic
– Name Formula– Formula Name– Transition Metals
• Exit Ticket
Two Types of Compounds
• Today, we learned the rules for molecular compounds
• Tomorrow, we will learn the rules for naming ionic compounds
• But how do we tell the two apart???
• Ionic Compounds – made of a METAL and a nonmetal
• Molecular Compounds - does not have a metal (could be nonmetal + nonmetal or metalloid + nonmetal)
Example
• Molecular of Ionic?
F3Cl5
Flash!
• You will be given an index card• On one side, write a big M• On the other side, write a big I• When I give you the signal, you will hold up
either M for Molecular, or I for Ionic
Flash!
• Molecular of Ionic?
NaCl
Flash!
• Molecular of Ionic?
dinitrogen pentaoxide
Flash!
• Molecular of Ionic?
magnesium oxide
Example
• Molecular of Ionic?
Si2F5
Example
• Molecular of Ionic?
KF
• When a nonmetal and a metal meet each other, they can’t share. They’re too different!
• So…the nonmetal will GRAB electron(s) from the metal.
• It forms an ION. Hence, the name IONIC bond
• Ionic Compounds = made of a metal and a nonmetal
Cation and AnionIonic Compounds are made of a cation and an anion.• Cation – a POSITIVELY charged atom formed by
losing an electron (almost always a metal)• Anion – a NEGATIVLEY charged atom formed by
gaining an electron (almost always a non-metal)
Ionic Love• How do we name these ionic compounds?
How do we go from formula to its name?
Ionic compounds DO NOT use Greek prefixes like molecular compounds. Charge is used instead.
1.Metals become cations (+).- Group 1 metals have a +1 charge (ex: Na+, Li+, K+)- Group 2 metals have a +2 charge (Mg2+, Ca2+)- Upper part of Group 3 have a +3 charge (Al3+)For cations, the ion name is the same as the element (Na+
= sodium ion)
Fill in the group charges on your periodic table
Ionic Rules Continued…
2. Non-metals form anions (-) (except Hydrogen-can form H+ or H-)-The noble gases have no charge (don’t react!) -The halogens form a -1 charge (F-, Cl-, Br-)-The oxygen family forms a -2 charge (O2-, S2-)-The nitrogen family forms a -3 charge (N3-, P3-)For anions, change the ending to “-ide” (ex: O2- = oxide and P3- = phosphide)
** Fancy word for charge = oxidation number
Steps
• 1. Write the cation (re: metal element) name. It will be the SAME as the normal element!
• 2. Write the anion (re: nonmetal element) name and change the ending to -ide.
Example
a. K2O
b. Na2S
You Try!
• MgCl2
• Na3N
How do we go from name to formula?Cesium Oxide
1. Write the symbol of each element
Write the oxidation number of each element using the periodic table.
2. Swap, drop and chop it!1. Swap the charges2. Drop the charges3. Chop off charge, reduce to simplest ratio)
+ -
Swap, Drop, and Chop it!
• What is the chemical formula of • Aluminum Oxide?
• Al O
3
2
Swap Drop and Chop It!
Calcium Oxide1.
2.
3.
Magnesium Nitride1.
2.
3.
You Try!
a. lithium bromide b. sodium iodide
Youtube break
http://www.youtube.com/watch?v=_JmA2ClUvUY
Transition Metals
Remember “short crazy land”? These are the transition metals and they have multiple charges- IF THE CHARGE VARIES, we need roman numerals to show the charge (ex: Fe2+ = iron (II) and Fe3+ = iron (III))-3 EXCEPTIONS: zinc is always Zn2+, cadmium is always Cd2+, and silver is always Ag+1
Writing the formulas
Same steps! chromium (III) oxide
lead (II) oxide
Naming
The charges must add up to 0!
SnBr2
SnBr4
More Practice
• cobalt (III) oxide
• copper (II) iodide
Even More Practice
• Hg2O
• HgS
-ide help
Flourine flourideOxygen oxidePhosphorus phosphideBromine bromideNitrogen nitrideChlorine chlorideHydrogen hydride
Exit Ticket
1. Write the name for NaI2
2. What is the formula for Beryllium Nitride?
Molecular
1. Pentaiodine monophosphide
2. Silicon dioxide
3. Se2Br5
4. NO4
Nomenclature Recap
2 nonmetals = ____________ compounduses greek prefixes: mono, di, tri, tetra…
1 metal + 1 nonmetal = ________compoundUse charges on periodic able toswap drop and lock it!
molecular
Ionic