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1. What are ionic compounds and what do they consist of?
2. Define cations and anions.3. How do you determine the charge of ions
formed from representative elements?
Ionic Compounds
Ions formed from transfer of electrons (to satisfy octet rule)
Consist of cations(+) and anions(-) held together by ionic bond (electrostatic force of attraction)
Typically, metals(+) and nonmetals(-)
What is the charge and symbol for the following Cations Anions
Magnesium? Copper (II)? Sodium? Zinc? Aluminum? Iron (III)
Nitride? Sulfide? Chloride? Iodide? Oxide?
Formulas: Ionic Compounds are electrically neutral Write the symbol and charge for each
ion Balance it! The total positive charge
must equal the total negative charge.
1. Potassium chloride2. Barium iodide
4. Nickel (II) fluoride
3. Aluminum oxide
Write formulas for
1. Lithium oxide
2. Iron (III) bromide
3. Nickel (II) fluoride
4. Aluminum sulfide
5. Magnesium chloride
6. Strontium phosphide
What are polyatomic ions?
Polyatomic Ions
Ions that are made up of more than one atom. Examples are SO4
2- or OH- or NO3
-
Use as you would any part of a compound
Write balanced formulas for
Barium nitrate Sodium permanganate Ammonium chromate Copper (II) hydroxide
When do you need parentheses?
Name these compounds
NaCl
K2S
(NH4)2O
1st …Cation 2nd … AnionMonatomic- Monatomic-same name as atom ends in “ide”*For transition metalsIndicate charge of the ion After the name using Roman numeral in parentheses
Naming binary ionic compounds …
NaCl
Try to name these ionic compounds
BaCl2 Na2S
Ca3P2
Cu2O
Cation Anion
Polyatomic – use the ion sheet!!!
Naming ionic compounds …
Name:1.KClO3
2.(NH4)2S3.Al(OH)3
4.FeSO4
Do Now… Name the following: CaF2
Al2O3
NaClO4
(NH4)3PO4
PbCrO4
LiClO NaCN Cu(NO3)2
What are the rules for naming
Ionic compounds?
Rules for
Monatomic positive ion …. If it’s a transition metal …. Monatomic negative ion … Polyatomic ion (positive ion or
negative ion) Get ready to put problems on
board from HW
What are molecular compounds? What do they consist of? What type of bonding is involved?
No charges … no balancing
Molecular Compounds
All nonmetals Share electrons(covalent bond) to
satisfy octet rule
Write the formula for
Carbon dioxide Carbon monoxide Dicarbon hexahydride
Prefix tells how many atoms are in the compound
Formula ---> Name
Molecular (binary compound only)
CO2
First atom - retainsthe name of the elementAdd a prefix if thereis more than one of theatom Carbon
Second atom - ends in “ide”.Also, always add a prefix indicating how many atoms
dioxide
Name PH3 PCl3 SiI4 NH3 XeF4
DO NOW!
When do you use parentheses? When do you use roman numerals? When do you use prefixes? Air is mainly composed of nitrogen and
oxygen gases. What are the formulas of these compounds?
Jill was handed an assortment of index cards. Each index card had the chemical symbol for an ion
Na+ Zn2+ Cl-
Ni2+ O2- PO43- Al3+
Jill formed ionic compounds using index cards. She combined sodium and zinc to from the compound Na2Zn. Is this a possible ionic compound? Why or why not?2. Jill then wrote the formulas for all the possible ionic comounds that can be formed. What formulas did she write? Name each compound.3. Jill wrote the following compounds. Identify whether each formula is correct or incorrect. If the formula is incorrect, change it to make it correct.
ZnCl3 Al3O2 Ca3(PO4)2
DO Now…1. What are the prefixes for the
numbers 1-10?2. How do you name a binary
molecular compound? for the first atom … for the second atom …
3. What are diatomic molecules? List the 7 examples.
)
Write balanced chemical formulas fora)Magnesium hydroxideb)Calcium acetatec)Barium phosphided)Ammonium sulfatee)Copper (II) fluoridef) Sodium sulfideg)Lead (III) dichromate
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