do now: 1.what are ionic compounds and what do they consist of? 2.define cations and anions. 3.how...

Do Now:

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